WO2010121379A1 - Treatment of ovarian cancer using an anticancer agent conjugated to an angiopep-2 analog - Google Patents

Abstract

Ovarian cancer is treated with conjugates of an anticancer agent and an Angiopep-2 polypeptide analog (i.e. a polypeptide comprising an ammo acid sequence at least 80% identical to Seq. ID NO:97). Such treatment includes utility in treating metastatic ovarian cancer and in treating patients who have previously exhibited resistance to standard chemotherapeutic agents. Preferred anticancer agents include taxanes while the preferred conjugate is ANG1005, a conjugate comprising three molecules of paclitaxel conjugated to the peptide Angiopep-2.

Description

TREATMENT OF OVARIAN CANCER USING AN ANTICANCER AGENT CONJUGATED TO AN ANGIOPEP-2 ANALOG

Background of the Invention

The invention relates to methods for the treatment of ovarian cancer. Ovarian cancer is a serious health problem; deaths from ovarian cancer in 2008 in the United States were estimated by the National Cancer Institute to be over 15,000, with over 21,000 new cases annually. It is the leading cause of deaths from gynecologic cancers and the fifth most common cause of cancer deaths in women. Based on these numbers, it is estimated that women have a lifetime risk of 1.39% of developing ovarian cancer.

Ovarian cancer is difficult to diagnose early, as the early symptoms are often non-specific for the disease. Thus, only 19% of ovarian cancers are diagnosed before the cancer has spread from the ovaries; indeed, 2/3 of diagnoses occur only occur after the cancer has metastasized to distant locations in the body. Once the cancer has metastasized, the five-year relative survival rate (as compared to the population as a whole) is only 30.6%. For these reasons, more effective treatments for ovarian cancer, especially those who have metastatic cancer, are needed.

Summary of the Invention

We have discovered that metastatic ovarian cancer is successfully treated by administration of ANG1005, a therapeutic which includes three molecules of paclitaxel conjugated to the peptide Angiopep-2 (SEQ ID NO:97). This conjugate is able to treat metastatic cancer having metastases both outside and inside the brain, even where the patient is not responsive to standard chemotherapeutic agents. Because ANG 1005 is effectively targeted to the cancer cells, it can, in certain cases, be administered at lower equivalent doses than paclitaxel by itself and retain efficacy. Likewise, because the conjugated paclitaxel of ANG 1005 can be less toxic than the unconjugated agent, ANGl 005 may also be administered in higher doses than paclitaxel alone and exhibit fewer side effects.

On the basis of this discovery, the invention features a method of treating a patient (e.g., a human) having cancer originating from the ovary (e.g., an ovarian epithelial carcinoma or ovarian adenocarcinoma, or metastatic form thereof). The method includes administering to the patient an effective amount of a conjugate including (a) an anticancer agent, and (b) a polypeptide including an amino acid sequence substantially identical to a polypeptide including the amino acid sequence of any of SEQ ID NOS : 1 - 105 and 107- 116 (e.g., SEQ ID NO:97), a modified form thereof (e.g., as described herein), or a fragment thereof, where the polypeptide, modified form, or fragment is conjugated to the anticancer agent. In certain embodiments, the anticancer agent is selected from the group consisting of paclitaxel, vinblastine, vincristine, etoposide, doxorubicin, cyclophosphamide, taxotere, melphalan, and chlorambucil. In particular embodiments, the anticancer agent is paclitaxel. In certain embodiments, the polypeptide includes an amino acid sequence at least 70%, 75%, 80%, 85%, 90%, 95%, or 100% identical to the sequence of SEQ ID NO:97. The polypeptide may have The conjugate may be administered in a dosage of about 1, 10, 25, 50, 100, 150, 200, 250, 300, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000, 2500, or 3000 mg/m², or any range between these numbers. In certain embodiments, the dosage is between 100 mg/m² and 2000 mg/m² or between 300 mg/m² and 1000 mg/m². The conjugate may be administered by any means known in the art, e.g., intravenously, orally, intraarterially, intranasally, intraperitoneally, intramuscularly, subcutaneously, transdermally, ox per os to the patient.

The ovarian cancer may be in any stage (e.g., Stage IA, IB, IC, HA, IIB, HC, HIA, IHB, IIIC, or IV) or any morphology grade (e.g., Grade 1, Grade 2, or Grade 3) as described herein. The cancer may be in one or both ovaries. The cancer may be confined to the interior of the ovary, or may appear on the outer surface of the ovary. In certain embodiments, cancer cells are found in uterus, fallopian tubes, or both. In other embodiments, the cancer has spread to pelvic organs such as the colon, bladder, or rectum. In other embodiments, cancer cells are found in the abdomen (e.g., visible to the naked eye (e.g., larger or smaller than 2 cm across), or visible only under a microscope). The cancer may also have metastasized to the lining of the abdomen or pelvis (peritoneum), organs of the abdomen such as the bowel, bladder, uterus, liver and lungs, or to the brain. The cancer may have metastasized to at least one location outside the ovary (e.g., to the brain, lung, or both). In certain embodiments, the cancer is in the lymph system. In certain embodiments, the patient has at least one metastasis outside the brain, lung, liver, kidney, or eye.

In particular embodiments, the cancer may be drug resistant or include drug resistant cells (e.g., cells that expresses MDRl). The cancer may be or may include cells that are resistant to any chemotherapeutic agent including paclitaxel, carboplatin, cisplatin, doxorubicin, topotecan, gemcitabine, docetaxel, a taxane derivative, or any agent described herein.

In other embodiments, the method includes administration of a second anticancer therapy (e.g., any therapy described herein). In certain embodiments, the patient may have previously received another chemotherapeutic agent (e.g., paclitaxel, a platinum agent such as carboplatin, cisplatin, doxorubicin, topotecan, gemcitabine, docetaxel, or any agent described herein) and may optionally be drug resistant with respect to that therapeutic. In particular embodiments, the patient previously received combination carboplatin-paclitaxel therapy. The patient may also have risk factors for developing ovarian cancer

(e.g., any risk factor described herein).

In any of the above embodiments, the polypeptide may be of any length, for example, at least 6, 7, 8, 9, 10, 1 1, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 25, 35, 50, 75, 100, 200, or 500 amino acids. In certain embodiments, the polypeptide is 10 to 50 amino acids in length. The conjugate may be substantially pure. The polypeptide may be produced by recombinant genetic technology or chemical synthesis. The conjugate can be formulated with a pharmaceutically acceptable carrier.

The polypeptide may include an amino acid sequence having the formula:

X1 -X2-X3-X4-X5-X6-X7-X8-X9-X10-X11 -X12 X13-X14-X15-X16-X17-

X18-X19

where each of Xl -X 19 (e.g., X1-X6, X8, X9, Xl 1-X14, and X 16-Xl 9) is, independently, any amino acid (e.g., a naturally occurring amino acid such as Ala, Arg, Asn, Asp, Cys, GIn, GIu, GIy, His, He, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr, and VaI) or absent and at least one (e.g., 2 or 3) of Xl, XlO, and Xl 5 is arginine. In some embodiments, X7 is Ser or Cys; or XlO and Xl 5 each are independently Arg or Lys. In some embodiments, the residues from Xl through X 19, inclusive, are substantially identical to any of the amino acid sequences of any one of SEQ ID NOS: 1-105 and 107-116 (e.g., Angiopep-1, Angiopep-2, Angiopep-3, Angiopep-4a, Angiopep-4b, Angiopep-5, Angiopep- 6, and Angiopep-7). In some embodiments, at least one (e.g., 2, 3, 4, or 5) of the amino acids Xl -X 19 is Arg. In some embodiments, the polypeptide has one or more additional cysteine residues at the N-terminal of the polypeptide, the C- terminal of the polypeptide, or both.

In certain embodiments of any of the above aspects, the polypeptide is modified (e.g., as described herein). The polypeptide may be amidated, acetylated, or both. Such modifications to polypeptides may be at the amino or carboxy terminus of the polypeptide. The conjugates of the invention may also include peptidomimetics of any of the polypeptides described herein. The polypeptide may be in a multimeric form, for example, dimeric form (e.g., formed by disulfide bonding through cysteine residues). In certain embodiments, the polypeptide has an amino acid sequence described herein with at least one amino acid substitution (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 substitutions). The polypeptide may contain, for example, 1 to 12, 1 to 10, 1 to 5, or 1 to 3 amino acid substitutions, for example, 1 to 10 (e.g., to 9, 8, 7, 6, 5, 4, 3, 2) amino acid substitutions. The amino acid substitution(s) may be conservative or non-conservative. For example, the polypeptide may have an arginine at one, two, or three of the positions corresponding to positions 1, 10, and 15 of the amino acid sequence of any of SEQ ID NO:1, Angiopep-1, Angiopep-2, Angiopep-3, Angiopep-4a, Angiopep- 4b, Angiopep-5, Angiopep-6, and Angiopep-7.

In any of the above aspects, the conjugate may specifically exclude a polypeptide including or consisting of any of SEQ ID NOS:1-105 and 107-116 (e.g., Angiopep-1, Angiopep-2, Angiopep-3, Angiopep-4a, Angiopep-4b, Angiopep-5, Angiopep-6, and Angiopep-7). In some embodiments, the polypeptides and conjugates of the invention exclude the polypeptides of SEQ ID NOS: 102, 103, 104, and 105. In some embodiments, the amino acid sequence has at least 35%, 40%,

50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% identity to an amino acid sequence selected from the group consisting of SEQ ID NOS: 1-105 and 107- 116, or a functional derivative thereof. In certain embodiments, the amino acid sequence has at least 35%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% identity to an amino acid sequence selected from the group consisting of Angiopep-2 (SEQ ID NO:97), Angiopep-4b, Angiopep-5, Angiopep-6, and Angiopep-7 (SEQ ID NOS: 109-116). In still other embodiments, the amino acid sequence has at least 35%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% identity to an amino acid sequence of Angiopep-2 (SEQ ID NO:97).

In some embodiments, the amino acid sequence comprises the amino acid sequence selected from the group consisting of SEQ ID NOS: 1-105 and 107-1 16, or a functional derivative thereof. In certain embodiments, the amino acid sequence is that of Angiopep-2 (SEQ ID NO:97), Angiopep-4b, Angiopep- 5, Angiopep-6, or Angiopep-7 (SEQ ID NOS: 109- 1 12). In still other embodiments, the amino acid sequence consists of the amino acid sequence selected from the group consisting of SEQ ID NOS: 1-105 and 107-116, or a functional derivative thereof. In certain embodiments, the amino acid sequence is that of Angiopep-2 (SEQ ID NO:97), Angiopep-4b, Angiopep-5, Angiopep-6, or Angiopep-7 (SEQ ID NOS: 109-112).

By "patient" is meant treating a human or non-human animal (e.g., a mammal).

By "treating" is meant ameliorating at least one symptom of a condition or disease in a subject having the condition or disease (e.g., a subject diagnosed with a metabolic disorder), as compared with an equivalent untreated control. Such reduction in the symptom (e.g., a reduction in blood glucose levels) is at least 5%, 10%, 20%, 40%, 50%, 60%, 80%, 90%, 95%, or 100%, as measured by any standard technique.

By "conjugate" is meant a polypeptide (e.g., those described herein) linked to an anticancer agent. The conjugation may be chemical in nature, such as via a linker, or genetic in nature for example by recombinant genetic technology.

By "an effective amount" is meant an amount of a compound required to treat or reduce ovarian cancer in a clinically relevant manner. For example, a sufficient amount of an active compound used to practice the present invention for therapeutic treatment of ovarian cancer depends upon the manner of administration, the age, body weight, and extent of the cancer. Ultimately, the prescribers will decide the appropriate amount and dosage regimen.

By "substantially identical" is meant a polypeptide or nucleic acid exhibiting at least 35%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 85%, 90%, 95%, or even 99% identity to a reference amino acid or nucleic acid sequence. For polypeptides, the length of comparison sequences will generally be at least 4 (e.g., at least 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 50, or 100) amino acids. For nucleic acids, the length of comparison sequences will generally be at least 60 nucleotides, preferably at least 90 nucleotides, and more preferably at least 120 nucleotides, or full length. It is to be understood herein that gaps may be found between the amino acids of an analogs which are identical or similar to amino acids of the original polypeptide. The gaps may include no amino acids, one or more amino acids which are not identical or similar to the original polypeptide. Biologically active analogs of the vectors (polypeptides) of the invention are encompassed herewith. Percent identity may be determined, for example, with n algorithm GAP, BESTFIT, or FASTA in the Wisconsin Genetics Software Package Release 7.0, using default gap weights. By "fragment" is meant a polypeptide originating from a portion of an original or parent sequence or from an analogue of said parent sequence. Fragments encompass polypeptides having truncations of one or more amino acids, wherein the truncation may originate from the amino terminus (N- terminus), carboxy terminus (C-terminus), or from the interior of the protein. A fragment may include the same sequence as the corresponding portion of the original sequence. Functional fragments of the vector (polypeptide) described herein are encompassed by the invention. Fragments may be at least 5 (e.g., at least 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 28, 30, 35, 40, 45, 50, 60, 75, 100, or 150) amino acids. Fragments of the invention may include, for example, a polypeptide of 7, 8, 9 or 10 amino acids to 18 amino acids. Fragments may contain any of the modifications described herein (e.g., acetylation, amidation, amino acid substitutions).

By a "drug resistant" cancer is meant a cancer that does not respond, or exhibits a decreased response to, one or more chemotherapeutic agents (e.g., any agent described herein).

A cancer "determined to be drug resistant" is meant that the cancer is drug resistant, based on unresponsiveness or decreased responsiveness to a chemotherapeutic agent, or is predicted to be drug resistant based on a prognostic assay (e.g., a gene expression assay). Other features and advantages of the invention will be apparent from the following Detailed Description, the drawings, and the claims.

Brief Description of the Drawings Figure 1 is a schematic diagram of the ANG 1005 structure. ANG 1005 includes three molecules of paclitaxel conjugated to the Angiopep-2 peptide (SEQ ID NO:97).

Figures 2 A and 2B are images showing a CT scan of the patient's brain prior to (Figure 2A) and following (Figure 2B) treatment with ANG 1005. Figures 3A-3D are images showing a CT scan of the patient's lung prior to (Figures 3A and 3C) and following (Figure 3B and 3D) treatment with ANG 1005.

Figures 4A and 4B are images showing a CT scan of the patient's abdomen, including liver, prior to (Figure 4A) and following (Figure 4B) treatment with ANG 1005.

Figures 5A and 5B are images showing a CT scan of the patient's pelvis prior to (Figure 5A) and following (Figure 5B) treatment with ANG 1005.

Figures 6A and 6B are graphs showing inhibition of ANG 1005 by the Angiopep-2 peptide (Figure 6A) or by receptor associated protein (RAP) or aprotinin (Figure 6B).

Figure 7 is a graph showing LRP expression in various cell types and cell lines. Data is taken from the Gene Expression Atlas from the Genetics Institute of the Novartis Research Foundation (available online at http://expression.gnf.org/cgi-bin/index.cgi#Q).

Detailed Description

We have discovered that administration of a peptide-drug-conjugate, as exemplified by ANG 1005 (Figure 1), is capable of treating ovarian cancer in a patient, and, in particular, is able to dramatically shrink metastatic tumors, both those within the brain, as well as those outside the brain (e.g., in the lung) of the patient following only two treatments with ANG 1005. Indeed, this particular patient's cancer appeared resistant to standard chemotherapeutics including docetaxel, carboplatin, gemcitabine, topotecan, and doxorubicin, as the patient's cancer continued to progress even after receiving these agents. Because ovarian cancer, particularly metastatic ovarian cancer, has proven to be difficult to treat effectively, and given that such cancers often develop resistance to standard therapies, there is a need for therapeutics and therapeutic regimens capable of treating cancers originating from the ovary, particularly where the cancer has metastasized.

Conjugate treatment in a patient suffering from ovarian cancer

A 73-year-old patient diagnosed with metastatic ovarian cancer was selected for participation in a clinical trial of ANG 1005. The patient was originally diagnosed in November 2006 with ovarian cancer. Prior to the clinical trial, the patient had received treatment from January 2007 through

April 2007 with Taxotere^® (docetaxel) and carboplatin. From February 2008 to March 2008, the patient received a combination of Gemzar^® (gemcitabine) and Hycamtin (topotecan). The patient was again given a combination of Taxotere^® (docetaxel) and carboplatin from March 2008 until July 2008. In November 2008, the patient was administered Doxil^® (doxorubicin). As the patient's cancer continued to progress even upon administration of these agents, the cancer appeared resistance to these agents.

The patient entered the clinical trial in January 2009. CT scans performed on January 7, 2009, prior to ANG 1005 treatment, indicated the presence of metastases in the brain (Figure 2A), lungs (Figures 3A and 3C), and liver (Figure 4A). Metastases were also detected in the lymph nodes. CT scans of the liver and pelvis were also performed (Figures 4A and 5A). On January 8, 2009, the patent was administered a single dose of ANG 1005 intravenously. Three weeks later, a second 650 mg/m² dose was administered. Following these administrations, a surprising reduction in the tumor volume occurred. A CT scan performed February 13, 2009 indicated that a substantial reduction in the size of brain metastases (Figure 2B) as well as lung metastases (Figures 3B and 3D) and liver (Figure 4B). CT scans of the pelvis (Figure 5B) are also shown. The patient received the third ANG 1005 does on February 19, 2009. Based on these observations, we believe that ANG 1005 is surprisingly well suited for treatment of metastatic cancer, particularly where the patient is resistant or is determined to be resistant to standard chemotherapeutic agents.

Clinical trial results The patient described above is a participant in one of two ongoing FDA trials for the ANG1005 therapeutic. The status of the first clinical trial is summarized in Table 1 below. These trials were performed to determine safety of the ANG 1005. The first trial involved patients having various brain cancers: anaplastic oligodendroglioma (AO), oligoastrocytoma (OA), anaplastic astrocytoma (AA), and glioblastoma multiforme (GBM). Table 1

PD (Progressive Disease), SD (Stable Disease)

A second ongoing trial involving patients suffering from metastatic cancer has also begun. Results from this trial are shown in Table 2 below. The ovarian cancer patient described above is represented as patient 134 in Table 2. Table 2

NSCLC Non small cell lung cancer

SCLC Small cell lung cancer

PR (Partial Response) MR (Minor Response), SD (Stable Disease),

Ovarian cancer

The methods of the invention include treatment of a patient having ovarian cancer. Ovarian cancer starts with formation of a tumor in the ovary of a patient. The ovaries include three different tissues types, epithelial, germ, and stromal, from which a tumor can arise. Most (85-90%) ovarian cancers are derived from epithelial tissue, which are generally ovarian carcinomas or adenocarcinomas. Other ovarian cancers include germ cell tumors and stromal cell tumors.

Risk factors for ovarian cancer The methods of the invention may involve treatment of patient that has any one or more of risk factors for ovarian cancer. Risk factors for developing ovarian cancer include age, obesity, and family history of ovarian cancer, personal history of breast cancer, high fat diet. Genetic risk factors include mutations on the BRCΛ1 and BRC A2 genes. Risk for ovarian cancer is reduced in individuals who have been pregnant, have taken oral contraceptives (birth control pills), and have had a tubal ligation.

Ovarian cancer stages

The methods of the invention may involve treatment of any stage or grade of ovarian cancer. Ovarian cancer is staged based on three categories: the T, N, and M categories and is further graded based on cellular morphology. The T categories are based on the location of cancer, i.e., whether the cancer is confined to the ovary or ovaries. N is evaluated based on whether the cancer has spread to the lymph nodes, and M is based on whether the cancer has spread to distant organs. These categories are described in detail below.

The T category is divided into three subcategories: Tl, where the cancer is confined to one or both ovaries; T2, where the cancer extends from one or both ovaries into pelvic tissues, and T3, where the cancer is in one or both ovaries and has spread to the abdominal lining (peritoneum) outside the pelvis. Each of Tl, T2, and T3 categories are further subdivided. Tl is divided into TIa, TIb, and Tie. In TIa stage cancer, the cancer is only inside one ovary, is not on the outside of the ovary, doesn't penetrate the tissue covering the ovary (the capsule), and is not in fluid taken from the pelvis. In TIb stage cancer, the cancer is inside both ovaries, but otherwise has the features of TIa stage cancer. In Tie stage cancer, the cancer is in one or both ovaries and is either on the outside of an ovary, has grown through the capsule of an ovary, or is in fluid taken from the pelvis.

T2 is likewise divided into the subcategories T2a, T2b, and T2c. In T2a stage cancer, the cancer has metastasized to the uterus or to the fallopian tubes, but cancer cells are not found in fluid taken from the pelvis. In T2b stage cancer, the cancer has spread to pelvic tissues other than the uterus and fallopian tubes, but it is not in fluid taken from the pelvis. In T2c stage cancer, the cancer has spread to the uterus, fallopian tubes, and/or other pelvic tissues and is also in fluid taken from the pelvis.

T3 is also divided into three subcategories: T3a, T3b, and T3c. In T3a stage cancer, the metastases can only be seen under a microscope. In T3b stage cancer, the metastases are visible, but no rumor is bigger than 2 cm. In T3c stage cancer, the metastases are larger than 2 cm.

The N categorization is based on whether the cancer has spread to regional lymph nodes. The cancer is graded NO if there is no lymph node involvement and is graded Nl if cancer cells are found in the lymph nodes close to the ovarian tumor.

The M categorization is based on whether the cancer has spread to distant organs, such as the liver, lungs, or non-regional lymph nodes. If there is no distant spread, the cancer is graded MO. If the cancer has spread to distant organs, including the inside of the liver and the lungs, it is graded Ml. Finally the cancer is graded based on its morphology, where a higher grade indicates a greater likelihood of metastasizing. Grade 1 indicates a well- differentiated tumor that appears similar to normal ovarian tissue. Grade 2 indicates a tumor that is not as well differentiated; it looks less like ovarian tissue than a Grade 1 tumor. A Grade 3 tumor is characterized as being poorly differentiated and does not look like ovarian tissue.

Once a patient's T, N, and M scores have been determined, this information is combined in a process called stage grouping to determine the stage, expressed in Roman numerals from stage I (least advanced) to stage IV (most advanced). The following Table sets forth the various stages of ovarian cancer. Table 3

Standard therapy for ovarian cancer

The methods of the invention may include, in addition to administration of a conjugates described herein, treatment using standard, art-recognized therapeutic options for a patient having ovarian cancer. The standard therapy or therapies will depend on the stage of cancer. The methods of the invention may also include administering a conjugate following prior treatment with one or more of the standard ovarian cancer therapies (e.g., following failure of the standard therapy).

In well-differentiated or moderately differentiated non-metastatic cancer (e.g., Grade 1 or 2), surgical removal of the tumor and surrounding tissue (e.g., bilateral salpingo-oophorectomy with omentectomy) is often sufficient for treatment of Stage IA or IB disease. If the tumor is Grade 3, densely adherent, or Stage IC, the treatment may further include intraperitoneal P-32 or radiation therapy or systemic chemotherapy based on platinums (e.g., carboplatin or cisplatin) alone or in combination with an alkylating agent. Other first line therapies include systemic chemotherapy based on platinums (e.g., carboplatin or cisplatin) with paclitaxel or administration of a nitrogen mustard (e.g., cyclophosphamide, mechlorethamine (mustine), uramustine (uracil mustard), melphalan, chlorambucil, and ifosfamide), nitrosoureas (e.g., carmustine and streptozocin), alkyl sulfonates (e.g., busulfan), or doxorubicin.

If the first line therapy fails, topotccan and hexamethylamine are FDA- approved as second line therapies. Other drugs used in second line therapy include doxorubicin, Doxil^® (doxorubicin HCl liposome injection), Hexalen^® (altretamine; hexamethylmelamine, Ifex^® (ifosfamide), VePesid^® (etoposide (VP-16)), 5-FU (5-fluorouracil), gemcitabine, and vinorelbine. These drugs can be administered alone or in combination with each other, with first line agents, or with other anticancer therapeutics (e.g., those described herein).

Treatment of drug resistant cancer

The patient being treated in a method of the present invention may have a cancer that is drug resistant. Because the conjugates of the invention have activity even in cancers that have demonstrated resistance to standard chemotherapeutic agents, the methods of the invention are particularly useful in treating such drug resistant cancers.

Drug resistance typically arises following treatment with a particular chemotherapeutic. Multiple drug resistance (MDR) can arise when a cell overproduces the p-glycoprotein (P-gp) efflux transporter. As many chemotherapeutic drugs can be P-gp substrates, including vinblastine, doxorubicin, etoposide, colchicine, and paclitaxel, overexpression of P-gp in a cancer cell can lead to broad spectrum of resistance toward chemotherapeutic agents.

We have previously shown that paclitaxel conjugated to Angiopep-1 or Angiopep-2 are not P-gp substrates and thus should not be sensitive to P-gp overexpression in tumor cells; see, e.g., pages 46-47 and Figure 9A of International Application Publication WO 2007/009229. Thus, the drug conjugates described herein are useful in treating patients having cancer that is resistant to standard chemotherapeutic drugs.

Enhanced uptake into LRP expressing cells

The methods of the invention may be especially uselul in treating cancers having cells that express low density lipoprotein-related protein (LRP) receptor. The LRP receptor is expressed on the surface of cells, and is capable of binding to various substrates including aprotinin, β-amyloid, tissue plasminogen activator (tPA), melano-transferrin, and receptor associated peptide (RAP). The peptides described herein were designed based on the consensus kunitz-domain sequences that act as LRP receptor ligands (see, e.g., PCT Publication No. WO 2004/060403). Uptake of the conjugates including Angiopep-1 or Λngiopep-2 is inhibited by LRP ligands, thus indicating involvement of LRP in this process. Specifically, the LRP ligands RAP (200 nM) and aprotinin (10 μM) are capable of reducing brain uptake of an Angiopep conjugate. Angiopep-2 (10 or 100 μM) is similarly able to reduce uptake of the conjugates into cells (Figures 6A and 6B). Ovarian cells express high levels of LRP (Figure 7). Accordingly, cancers originating from ovarian cells are well suited for treatment using therapeutics that target LRP-expressing cells.

The results described in Figures 4A and 4B were obtained using an in situ rat brain perfusion. Male Sprague Dawley rats were anesthetized with 40m/kg Lp., of sodium pentobarbital (Nembutal, Abbott Laboratories, North Chicago, IL, USA). The neck region was shaved and the common carotid artery was exposed. The external carotid artery was ligated, but the pterygopalatine artery was not occluded. A PE-60 catheter filled with heparinized 0.9% saline (100 IU/mL) was inserted into the common carotid artery upon ligation. A heating pad linked to YSI feedback controller device (Yellow Springs Instruments, Yellow Springs, OH, USA) was used to maintain the rat body temperature at 37 ⁰C. The PE-60 catheter was attached to a glass syringe filled with the tracer; with or without inhibitors, in a bicarbonate- buffered physiological saline (Smith QR., Pharm Biotechnol 8:285-307, 1996) mounted on a Harvard infusion pump (Harvard Biosciences, South Natick, MA, USA) maintained at 37⁰C. Dual-labeled experiments were performed for studying the brain uptake. [¹⁴C]Sucrose was used as a vascular volume marker. Perfusion was started upon severing the heart to stop blood flow to the brain. The fluid was perfused into the common carotid artery at a rate of 5 ml/min for a period of 15-300 sec. At the end of perfusion, the rat was decapitated and the brain was harvested. The left hemisphere of the brain was dissected into regions as described previously (Takasato et al., Am J Physiol 247:H484-93, 1984). The samples were weighed and counted using the gamma counter (Cobra 600) to determine the ¹²⁵I labeled drug. In the inhibition studies, the LRP ligands or Angiopep peptides were co-perfused at the indicated concentrations.

Combination therapy

The methods of the invention may include administration of second therapeutic agent or treatment with a second therapy (e.g., a therapeutic agent or therapy that is standard in the art). Exemplary therapeutic agents include abarelix, aldesleukin, alemtuzumab, alitretinoin, allopurinol, altretamine, amifostine, anakinra, anastrozole, arsenic trioxide, asparaginase, azacitidine, BCG Live, bevacuzimab, bexarotene, bleomycin, bleomycin, bortezombi, bortezomib, busulfan, busulfan, calusterone, capecitabine, carboplatin, caπnustine, celecoxib, cetuximab, chlorambucil, cisplatin, cladribine, clofarabine, cyclophosphamide, cytarabine, dacarbazine, dactinomycin, actinomycin D, dalteparin (e.g., sodium), darbepoetin alfa, dasatinib, daunorubicin, daunomycin, decitabine, denileukin, denileukin diftitox, dexrazoxane, docetaxel, doxorubicin, dromostanolone propionate, eculizumab, epirubicin (e.g., HCl), epoetin alfa, erlotinib, estramustine, etoposide (e.g., phosphate), exemestane, fentanyl (e.g., citrate), filgrastim, floxuridine, fludarabine, fluorouracil, 5-FU, fiilvestrant, gefitinib, gemcitabine (e.g., HCl), gemtuzumab ozogamicin, goserelin (e.g., acetate), histrelin (e.g., acetate), hydroxyurea, ibritumomab tiuxetan, idarubicin, ifosfamide, imatinib (e.g., mesylate), Interferon alfa-2b, irinotecan, lapatinib ditosylate, lenalidomide, letrozole, leucovorin, leuprolide (e.g., acetate), levamisole, lomustine, CCNU, meclorethamine (nitrogen mustard), megestrol, melphalan (L-PAM), mercaptopurine (6-MP), mesna, methotrexate, methoxsalen, mitomycin C, mitotane, mitoxantrone, nandrolone phenpropionate, nelarabine, nofetumomab, oprelvekin, oxaliplatin, paclitaxel, palifermin, pamidronate, panitumumab, pegademase, pegaspargase, pegfilgrastim, peginterferon alfa-2b, pemetrexed (e.g., disodium), pentostatin, pipobroman, plicamycin (mithramycin), porfimer (e.g., sodium), procarbazine, quinacrine, rasburicase, rituximab, sargramostim, sorafenib, streptozocin, sunitinib (e.g., maleate), talc, tamoxifen, temozolomide, teniposide (VM-26), testolactone, thalidomide, thioguanine (6-TG), thiotepa, thiotepa, thiotepa, topotecan (e.g., HCl), toremifene, Tositumomab/I-131 (tositumomab), trastuzumab, trastuzumab, tretinoin (ATRA), uracil mustard, valrubicin, vinblastine, vincristine, vinorelbine, vorinostat, zoledronate, and zoledronic acid. Exemplary derivatives of paclitaxel are described in U.S. Patent No. 6,911,549, the entire contents of which are hereby incorporated by reference.

Other agents include that can be used include antiestrogen agents such as tamoxifen (e.g., citrate), raloxifene, toremifene, and SCH 57068.

Polypeptide conjugates

The methods of the invention include administration of a peptide- anticancer agent conjugate, such as those described in U.S. Patent Applications Publication Nos. 2006/0182684, and 2006/0189515, and U.S. Provisional Application No. 61/008,880, filed December 20, 2007. Such conjugates may include any polypeptide described herein, an agent capable of treating ovarian cancer such as paclitaxel or a paclitaxel analog (e.g., those described herein), and a linker (e.g., those described herein). Paclitaxel conjugates are exemplified by ANG1005, which includes the AngioPep-2 peptide (SEQ ID NO:97) conjugated to three paclitaxel molecules through ester linkages at the N-terminus, and through lysines at positions 10 and 15.

The conjugates, in certain embodiments, can cross the blood-brain barrier (BBB) or can be preferentially targeted to certain cell types, such as ovary, liver, lung, kidney, muscle cells or may be targeted to tumor cells (of any cell type described herein). These agents conjugated to these peptides can exhibit increased uptake into the targeted cells, for example, by receptor- mediated endocytosis (e.g., through an LRP receptor). The conjugated agents may, either alternatively or in addition, exhibit increased stability or reduced expulsion from the cell (e.g., due to P-glycoprotein mediated efflux). Conjugates may further have activity in cancer cells that are resistant to standard chemotherapies.

Polypeptides

The methods of the invention can include administration a conjugate include any polypeptide described herein, for example, any of the polypeptides described in Table 4 (e.g., a polypeptide defined in any of SEQ ID NOS: 1-105 and 107-116 such as SEQ ID NOS: 1-97, 99, 100, 101, or 107-116), or any fragment, analog, derivative, or variant thereof. In certain embodiments, the polypeptide may have at least 35%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, or even 100% identity to a polypeptide described herein. The polypeptide may have one or more (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15) substitutions relative to one of the sequences described herein. Other modifications are described in greater detail below.

The conjugates can also feature fragments of these polypeptides (e.g., a functional fragment). In certain embodiments, the fragments are capable of entering or accumulating in a particular cell type (e.g., ovary, liver, lung, kidney, spleen, or muscle) or capable of crossing the BBB. Truncations of the polypeptide may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or more amino acids from either the N-terminus of the polypeptide, the C-terminus of the polypeptide, or a combination thereof. Other fragments include sequences where internal portions of the polypeptide are deleted.

Additional polypeptides may be identified by using one of the assays or methods described in U.S. Patent Application Publication No. 2006/0189515, which is hereby incorporated by reference, or by any method known in the art. For example, a candidate vector may be produced by conventional polypeptide synthesis, conjugated with Taxol and administered to a laboratory animal. A biologically active vector may be identified, for example, based on its efficacy to increase survival of an animal injected with tumor cells and treated with the conjugate as compared to a control which has not been treated with a conjugate (e.g., treated with the unconjugated agent).

In another example, a biologically active polypeptide may be identified based on its location in the parenchyma in an in situ cerebral perfusion assay. In vitro BBB assays, such as the model developed by CELLIAL™ Technologies, may be used to identify such vectors. Assays to determine accumulation in other tissues may be performed as well. Labeled conjugates of a polypeptide can be administered to an animal, and accumulation in different organs can be measured. For example, a polypeptide conjugated to a detectable label (e.g., a near-IR fluorescence spectroscopy label such as Cy5.5) allows live in vivo visualization. Such a polypeptide can be administered to an animal, and the presence of the polypeptide in an organ can be detected, thus allowing determination of the rate and amount of accumulation of the polypeptide in the desired organ. In other embodiments, the polypeptide can be labeled with a radioactive isotope (e.g., ¹²⁵I). The polypeptide is then administered to an animal. After a period of time, the animal is sacrificed, and the animal's organs are extracted. The amount of radioisotope in each organ can then be measured using any means known in the art. By comparing the amount of a labeled candidate polypeptide in a particular organ without amount of labeled control, the ability of the candidate polypeptide the rate or amount of accumulation of a candidate polypeptide in a particular tissue can be ascertained. Appropriate negative controls include any polypeptide known not be transported into a particular cell type.

TABLE 4

SEQ

ID

NO:

1 T F V Y G G C R A K R N N F K S A E D

2 T F Q Y G G C M GN G N N F V T E K E

3 P F F Y G G C G G N R N N F D T E E Y

4 S F Y Y G G C L GN K N N Y L R E E E

5 T F F Y G G C R A K R N N F K R A K Y

6 T F F Y G G C R G K R N N F K R A K Y

7 T F F Y G G C R A K K N N Y K R A K Y

8 T F F Y G G C R G K K N N F K R A K Y

9 T F Q Y G G C R A K R N N F K R A K Y

10 T F Q Y G G C R G K K N N F K R A K Y

11 T F F Y G G C L G K R N N F K R A K Y

12 T F F Y G G S L G K R N N F K R A K Y

13 P F F Y G G C G G K K N N F K R A K Y

14 T F F Y G G C R G K G N N Y K R A K Y

15 P F F Y G G C R G K R N N F L R A K Y

16 T F F Y G G C R G K R N N F K R E K Y

17 P F F Y G G C R A K K N N F K R A K E

18 T F F Y G G C R G K R N N F K R A K D

19 T F F Y G G C R A K R N N F D R A K Y

20 T F F Y G G C R G K K N N F K R A E Y

21 P F F Y G G C G A N R N N F K R A K Y

22 T F F Y G G C G G K K N N F K T A K Y

23 T F F Y G G C R G N R N N F L R A K Y

24 T F F Y G G C R G N R N N F K T A K Y TABLE 4

25 T F F Y G G S R GN R N N F K T A K Y

26 T F F Y G G C L G N G N N F K R A K Y

27 T F F Y G G C L GN R N N F L R A K Y

28 T F F Y G G C L G N R N N F K T A K Y

29 T F F Y G G C R GN G N N F K S A K Y

30 T F F Y G G C R G K K N N F D R E K Y

31 T F F Y G G C R G K R N N F L R E K E

32 T F F Y G G C R G K G N N F D R A K Y

33 T F F Y G G S R G K G N N F D R A K Y

34 T F F Y G G C R GN G N N F V T A K Y

35 P F F Y G G C G G K G N N Y V T A K Y

36 T F F Y G G C L G K G N N F L T A K Y

37 S F F Y G G C L G N K N N F L T A K Y

38 T F F Y G G C G G N K N N F V R E K Y

39 T F F Y G G C M G N K N N F V R E K Y

40 T F F Y G G S M GN K N N F V R E K Y

41 P F F Y G G C L G N R N N Y V R E K Y

42 T F F Y G G C L G N R N N F V R E K Y

43 T F F Y G G C L G N K N N Y V R E K Y

44 T F F Y G G C G G N G N N F L T A K Y

45 T F F Y G G C R GN R N N F L T A E Y

46 T F F Y G G C R G N G N N F K S A E Y

47 P F F Y G G C L G N K N N F K T A E Y

48 T F F Y G G C R G N R N N F K T E E Y

49 T F F Y G G C R G K R N N F K T E E D

50 P F F Y G G C G G N G N N F V R E K Y

51 S F F Y G G C M G N G N N F V R E K Y

52 P F F Y G G C G G N G N N F L R E K Y

53 T F F Y G G C L GN G N N F V R E K Y

54 S F F Y G G C L GN G N N Y L R E K Y

55 T F F Y G G S L GN G N N F V R E K Y

56 T F F Y G G C R GN G N N F V T A E Y

57 T F F Y G G C L G K G N N F V S A E Y

58 T F F Y G G C L GN R N N F D R A E Y

59 T F F Y G G C L GN R N N F L R E E Y TABLE 4

60 T F F Y G G C L G N K N N Y L R E E Y

61 P F F Y G G C G G N R N N Y L R E E Y

62 P F F Y G G S G G N R N N Y L R E E Y

63 M R P D F C L E P P Y T G P C V A R I

64 A R I I R Y F Y N A K A G L C Q T F V Y G

65 Y G G C R Λ K R N N Y K S A E D C M R T C G

66 P D F C L E P P Y T G P C V A R I I R Y F Y

67 T F F Y G G C R G K R N N F K T E E Y

68 K F F Y G G C R G K R N N F K T E E Y

69 T F Y Y G G C R G K R N N Y K T E E Y

70 T F F Y G G S R G K R N N F K T E E Y

71 C T F F Y G C C R G K R N N F K T E E Y

72 T F F Y G G C R G K R N N F K T E E Y C

73 C T F F Y G S C R G K R N N F K T E E Y

74 T F F Y G G S R G K R N N F K T E E Y C

75 P F F Y G G C R G K R N N F K T E E Y

76 T F F Y G G C R G K R N N F K T K E Y

77 T F F Y G G K R G K R N N F K T E E Y

78 T F F Y G G C R G K R N N F K T K R Y

79 T F F Y G G K R G K R N N F K T A E Y

80 T F F Y G G K R G K R N N F K T A G Y

81 T F F Y G G K R G K R N N F K R E K Y

82 T F F Y G G K R G K R N N F K R A K Y

83 T F F Y G G C L G N R N N F K T E E Y

84 T F F Y G C G R G K R N N F K T E E Y

85 T F F Y G G R C G K R N N F K T E E Y

86 T F F Y G G C L G N G N N F D T E E E

87 T F Q Y G G C R G K R N N F K T E E Y

88 Y N K E F G T F N T K G C E R G Y R F

89 R F K Y G G C L G N M N N F E T L E E

90 R F K Y G G C L G N K N N F L R L K Y

91 R F K Y G G C L G N K N N Y L R L K Y

92 K T K R K R K K Q R V K 1 A Y E E I F K N Y

93 K T K R K R K K Q R V K I A Y

94 R G G R L S Y S R R F S T S T G R TABLE 4

95 R R L S Y S R R R F

96 R Q I K I W F Q N R R M K W K K

97 T F F Y G G S R G K R N N F K T E E Y

98 M R P D F C L b P P Y T G P C V A R I I R Y F Y N A K A G L C Q T F V Y G G C R A K R N N F K S A E D C M R T C G G A

99 T F F Y G G C R G K R N N F K T K E Y

100 R F K Y G G C L G N K N N Y L R L K Y

101 T F F Y G G C R A K R N N F K R A K Y

102 N A K A G L C Q I F V Y G G C L A K R N N F E S A E D C M R T C G G A

103 Y G G C R A K R N N F K S A E D C M R T C G G A

104 G L C Q T F V Y G G C R A K R N N F K S A E

105 L C Q T F V Y G G C E A K R N N F K S A

107 T F F Y G G S R G K R N N F K T E E Y

108 R F F Y G G S R G K R N N F K T E E Y

109 R F F Y G G S R G K R N N F K T E E Y

110 R F F Y G G S R G K R N N F R T E E Y

111 T F F Y G G S R G K R N N F R T E E Y

112 T F F Y G G S R G R R N N F R T E E Y

113 C T F F Y G G S R G K R N N F K T E E Y

114 T F F Y G G S R G K R N N F K T E E Y C

115 C T F F Y G G S R G R R N N F R T E E Y

116 T F F Y G G S R G R R N N F R T E E Y C

Peptide no 5 includes the sequence of SEQ ID NO 5 and is amidated at its C-terminus (see for example Fig 1 )

Peptide No 67 includes the sequence of SEQ ID NO 67 and is amidated at its C-terminus (see for example Fig 1 ) Peptide No 76 includes the sequence of SEQ ID NO 76 and is amidated at its C-terminus

(see for example Fig 1)

Peptide no 91 includes the sequence of SEQ ID NO 91 and is amidated at its C-terminus (see for example Fig 1 )

Peptide No 107 includes the sequence of SEQ ID NO 97 and is acetylated at its N- terminus

Peptide No 109 includes the sequence of SEQ ID NO 109 and is acetylated at its N- terminus Peptide No. 110 includes the sequence of SEQ ID NO:110 and is acetylated at its N- terminus.

The amine groups of Angiopep-1 (SEQ ID NO:67) and Angiopep-2 (SEQ ID NO:97) have been used as sites for conjugation of agents. To study the role of amine groups in conjugation and their impact in the overall transport capacity of these vectors, new vectors, based on the Angiopep-1 and Angiopep- 2 sequence, were designed with variable reactive amine groups and variable overall charge. These polypeptides are shown in Table 5.

Table 5: Vectors with variable amine group targets

^*Angiopep-3 is an acetylated form of Angiopep-2. 1Ac represents acetylation.

Modified polypeptides

The methods of the invention may also include administration of a conjugate that includes a polypeptide with a modification to an amino acid sequence described herein (e.g., polypeptide having a sequence described in any one of SEQ ID NOS:1-105 and 107-1 12 such as AngioPep-3, -4a, -4b, -5, - 6, or -7). In certain embodiments, the modification does not destroy significantly a desired biological activity. In some embodiments, the modification may cause a reduction in biological activity (e.g., by at least 5%, 10%, 20%, 25%, 35%, 50%, 60%, 70%, 75%, 80%, 90%, or 95%). In other embodiments, the modification has no effect on the biological activity or may increase (e.g., by at least 5%, 10%, 25%, 50%, 100%, 200%, 500%, or 1000%) the biological activity of the original polypeptide. The modified polypeptide may have or may optimize one or more of the characteristics of a polypeptide of the invention which, in some instance might be needed or desirable. Such characteristics include in vivo stability, bioavailability, toxicity, immunological activity, or immunological identity.

Polypeptides used in the invention may include amino acids or sequences modified either by natural processes, such as posttranslational processing, or by chemical modification techniques known in the art. Modifications may occur anywhere in a polypeptide including the polypeptide backbone, the amino acid side-chains and the amino- or carboxy-terminus. The same type of modification may be present in the same or varying degrees at several sites in a given polypeptide, and a polypeptide may contain more than one type of modification. Polypeptides may be branched as a result of ubiquitination, and they may be cyclic, with or without branching. Cyclic, branched, and branched cyclic polypeptides may result from posttranslational natural processes or may be made synthetically. Other modifications include pegylation, acetylation, acylation, addition of acetomidomethyl (Acm) group, ΛDP-ribosylation, alkylation, amidation, biotinylation, carbamoylation, carboxyethylation, esterification, covalent attachment to flavin, covalent attachment to a heme moiety, covalent attachment of a nucleotide or nucleotide derivative, covalent attachment of drug, covalent attachment of a marker (e.g., fluorescent or radioactive), covalent attachment of a lipid or lipid derivative, covalent attachment of phosphatidylinositol, cross-linking, cyclization, disulfide bond formation, dcmethylation, formation of covalent crosslinks, formation of cystine, formation of pyroglutamate, formylation, gamma- carboxylation, glycosylation, GPI anchor formation, hydroxylation, iodination, methylation, myristoylation, oxidation, proteolytic processing, phosphorylation, prenylation, racemization, selenoylation, sulfation, transfer-RNA mediated addition of amino acids to proteins such as arginylation and ubiquitination. A modified polypeptide may further include an amino acid insertion, deletion, or substitution, either conservative or non-conservative (e.g., D-amino acids, desamino acids) in the polypeptide sequence (e.g., where such changes do not substantially alter the biological activity of the polypeptide).

Substitutions may be conservative (i.e., wherein a residue is replaced by another of the same general type or group) or non-conservative (i.e., wherein a residue is replaced by an amino acid of another type). In addition, a non- naturally occurring amino acid may substituted for a naturally occurring amino acid (i.e., non-naturally occurring conservative amino acid substitution or a non-naturally occurring non-conservative amino acid substitution).

Polypeptides made synthetically may include substitutions of amino acids not naturally encoded by DNA (e.g., non-naturally occurring or unnatural amino acid). Examples of non-naturally occurring amino acids include D- amino acids, an amino acid having an acetylaminomethyl group attached to a sulfur atom of a cysteine, a pegylated amino acid, the omega amino acids of the formula NH₂(CH₂)_nCOOH wherein n is 2-6, neutral nonpolar amino acids, such as sarcosine, t-butyl alanine, t-butyl glycine, N-methyl isoleucine, and norleucine. Phenylglycine may substitute for Trp, Tyr, or Phe; citrulline and methionine sulfoxide are neutral nonpolar, cysteic acid is acidic, and ornithine is basic. Proline may be substituted with hydroxyproline and retain the conformation conferring properties.

Analogues may be generated by substitutional mutagenesis and retain the biological activity of the original polypeptide. Examples of substitutions identified as "conservative substitutions" are shown in Table 3. If such substitutions result in a change not desired, then other type of substitutions, denominated "exemplary substitutions" in Table 6, or as further described herein in reference to amino acid classes, are introduced and the products screened. Substantial modifications in function or immunological identity are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain. Naturally occurring residues are divided into groups based on common side chain properties:

(1) hydrophobic: norleucine, methionine (Met), Alanine (Ala), Valine (VaI), Leucine (Leu), Isoleucine (He), Histidine (His), Tryptophan (Tip), Tyrosine (Tyr), Phenylalanine (Phe),

(2) neutral hydrophilic: Cysteine (Cys), Serine (Ser), Threonine (Thr)

(3) acidic/negatively charged: Aspartic acid (Asp), Glutamic acid (GIu)

(4) basic: Asparagine (Asn), Glutamine (GIn), Histidine (His), Lysine (Lys), Arginine (Arg) (5) residues that influence chain orientation: Glycine (GIy), Proline

(Pro);

(6) aromatic: Tryptophan (Trp), Tyrosine (Tyr), Phenylalanine (Phe), Histidine (His),

(7) polar: Ser, Thr, Asn, GIn (8) basic positively charged: Arg, Lys, His, and;

(9) charged: Asp, GIu, Arg, Lys, His

Other conservative amino acid substitutions are listed in Table 3. Table 6 Amino acid substitution

Additional analogues

The conjugates used in the invention may include any polypeptide analog of aprotinin known in the art. For example, U.S. Patent No. 5,807,980 describes Bovine Pancreatic Trypsin Inhibitor (aprotinin)-derived inhibitors as well as a method for their preparation and therapeutic use, including the polypeptide of SEQ ID NO: 102. These polypeptides have been used for the treatment of a condition characterized by an abnormal appearance or amount of tissue factor and/or factor Villa such as abnormal thrombosis. U.S. Patent No. 5,780,265 describes serine protease inhibitors capable of inhibiting plasma kallikrein, including SEQ ID NO:103. U.S. Patent No. 5,118,668 describes Bovine Pancreatic Trypsin Inhibitor variants, including SEQ ID NO:105. The aprotinin amino acid sequence (SEQ ID NO:98), the Angiopep-1 amino acid sequence (SEQ ID NO:67), and SEQ ID NO: 104, as well as some sequences of biologically active analogs may be found in International Application Publication No. WO 2004/060403. An exemplary nucleotide sequence encoding an aprotinin analogue is illustrated in SEQ ID NO: 106 (atgagaccag atttctgcct cgagccgccg tacactgggc cctgcaaagc tcgtatcatc cgttacttct acaatgcaaa ggcaggcctg tgtcagacct tcgtatacgg cggctgcaga gctaagcgta acaacttcaa atccgcggaa gactgcatgc gtacttgcgg tggtgcttag; Genbank accession No. X04666). This sequence encodes a lysine at position 16 instead of a valine, as found in SEQ ID NO:98. A mutation in the nucleotide sequence of SEQ ID NO: 106 may be introduced by methods known in the art to change the produce the polypeptide of SEQ ID NO:98 having a valine in position 16. Additional mutations or fragments may be obtained using any technique known in the art.

Other examples of aprotinin analogs may be found by performing a protein BLAST (Genebank: www.ncbi.nlm.nih.gov/BLAST/) using the synthetic aprotinin sequence (or portion thereof) disclosed in International Application No. PCT/CA2004/000011. Exemplary aprotinin analogs are found under accession Nos. CAA37967 (GI:58005) and 1405218C (GL3604747).

Conjugates

The polypeptides described herein or derivatives thereof are conjugated to an anticancer agent (e.g., any known in the art). Each polypeptide may be conjugated to at least 1, 2, 3, 4, 5, 6, or 7 agents. In other embodiments, each agent has at least 1, 2, 3, 4, 5, 6, 7, 10, 15, 20, or more polypeptides attached thereto. The conjugates of the invention may be able to promote accumulation (e.g., due to increased uptake or reduced removal) of the agent in a particular cell type or tissue such as ovary, liver, lung, kidney, spleen or muscle of a subject.

The agent may be releasable from the vector after transport into a particular cell type or across the BBB. The agent can be released, for example, by enzymatic cleavage or other breakage of a chemical bond between the vector and the agent. The released agent may then function in its intended capacity in the absence of the vector. In particular embodiments, the agent is paclitaxel or a paclitaxel analog (e.g., those described herein). Other anticancer agents include abarelix, aldesleukin, alemtuzumab, alitretinoin, allopurinol, altretamine, amifostine, anakinra, anastrozole, arsenic trioxide, asparaginase, azacitidine, BCG Live, bevacuzimab, bexarotene, bleomycin, bleomycin, bortezombi, bortezomib, busulfan, busulfan, calusterone, capecitabine, carboplatin, carmustine, celecoxib, cetuximab, chlorambucil, cisplatin, cladribine, clofarabine, cyclophosphamide, cytarabine, dacarbazine, dactinomycin, actinomycin D, dalteparin (e.g., sodium), darbepoetin alfa, dasatinib, daunorubicin, daunomycin, decitabine, denileukin, Denileukin diftitox, dexrazoxane, docetaxel, doxorubicin, dromostanolone propionate, eculizumab, epirubicin (e.g., HCl), epoetin alfa, erlotinib, estramustine, etoposide (e.g., phosphate), exemestane, fentanyl (e.g., citrate), filgrastim, floxuridine, fludarabine, fluorouracil, 5-FU, fulvestrant, gefitinib, gemcitabine (e.g., HCl), gemtuzumab ozogamicin, goserelin (e.g., acetate), histrelin (e.g., acetate), hydroxyurea, ibritumomab tiuxetan, idarubicin, ifosfamide, imatinib (e.g., mesylate), Interferon alfa-2b, irinotecan, lapatinib ditosylate, lenalidomide, letrozole, leucovorin, leuprolide (e.g., acetate), levamisole, lomustine, CCNU, meclorethamine (nitrogen mustard), megestrol, melphalan (L-PAM), mercaptopurine (6-MP), mesna, methotrexate, methoxsalen, mitomycin C, mitotane, mitoxantrone, nandrolone phenpropionate, nelarabine, nofetumomab, oprelvekin, oxaliplatin, paclitaxel, palifermin, pamidronate, panitumumab, pegademase, pegaspargase, pegfilgrastim, peginterferon alfa-2b, pemetrexed (e.g., disodium), pentostatin, pipobroman, plicamycin (mithramycin), porfimer (e.g., sodium), procarbazine, quinacrine, rasburicase, rituximab, sargramostim, sorafenib, streptozocin, sunitinib (e.g., maleate), talc, tamoxifen, temozolomide, teniposide (VM-26), testolactone, thalidomide, thioguanine (6-TG), thiotepa, thiotepa, thiotepa, topotecan (e.g., hcl), toremifene, Tositumomab/I-131 (tositumomab), trastuzumab, trastuzumab, tretinoin (ATRA), uracil mustard, valrubicin, vinblastine, vincristine, vinorelbine, vorinostat, zoledronate, and zoledronic acid.

Other anticancer agents include antibodies. Conjugation of such antibodies may be accomplished using any means known in the art (e.g., using the conjugation strategies described herein). Any diagnostic or therapeutic antibody may be conjugated to one or more (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or more) vectors of the invention. In addition, antibody fragments (e.g., capable of binding to an antigen) may also be conjugated to the vectors of the invention. Antibody fragments include the Fab and Fc regions, heavy chain, and light chain of an antibody (e.g., of any antibody described herein). Exemplary antibodies for use in diagnosis and therapy of cancer include ABX-EGF (Panitimumab), OvaRex (Oregovemab), Theragyn (pemtumomabytrrium-90), Therex, Bivatuzumab, Panorex (Edrecolomab), ReoPro (Abciximab), Bexxar (Tositumomab), MAb, idiotypic 105AD7, Anti-EpCAM (Catumaxomab), MAb lung cancer (from Cytoclonal), Herceptin (Trastuzumab), Rituxan (Rituximab), Avastin (Bevacizumab), AMD Fab (Ranibizumab), E-26 (2^nd gen. IgE) (Omalizumab), Zevalin (Rituxan + yttrium-90) (Ibritumomab tiuxetan), Cetuximab, BEC2 (Mitumomab), IMC-ICl 1, nuC242-DMl, LymphoCide (Epratuzumab), LymphoCide Y-90, CEA-Cide (Labetuzumab), CEA-Cide Y- 90, CEA-Scan (Tc-99m-labeled arcitumomab), LeukoScan (Tc-99m-labeled sulesomab), LymphoScan (Tc-99m-labeled bectumomab), AFP-Scan (Tc-99m- labeled), HumaRAD-HN (+ yttrium-90), HumaSPECT (Votumumab), MDX- 101 (CTL A-4), MDX-210 (her-2 overexpression), MDX-210/MAK, Vitaxin, MAb 425, IS-IL-2, Campath (alemtuzumab), CD20 streptavidin, Avidicin, (albumin + NRLU13), Oncolym (+ iodine-131) Cotara (+ iodine-131), C215 (+ staphylococcal enterotoxin, MAb lung/kidney cancer (from Pharmacia Corp.), nacolomab tafenatox (C242 staphylococcal enterotoxin), Nuvion (Visilizumab), SMART M195, SMART IDlO, CEA Vac, TriGem, TriΛb, NovoMAb-G2 radiolabeled, Monopharm C, GHoMAb-H (+ gelonin toxin), Rituxan (Rituximab), and ING-I . Additional therapeutic antibodies include 5G1.1 (Ecluizumab), 5G1.1-SC (Pexelizumab), ABX-CBL (Gavilimomab), ABX-IL8, Antegren (Natalizumab), Anti-CD 1 Ia (Efalizumab), Anti-CD 18 (from Genetech), Anti-LFAl, Antova, BTI-322, CDP571, CDP850, Corsevin M, D2E7 (Adalimumab), Humira (Adalimumab), Hu23F2G (Rovelizumab), IC 14, IDEC- 114, IDEC- 131, IDEC- 151, IDEC- 152, Infliximab (Remicade), LDP-01 , LDP-02, MAK- 195F (Afelimomab), MDX-33, MDX-CD4, MEDI-507 (Siplizumab), OKT4A, OKT3 (Muromonab- CD3), and ReoPro (Abciximab).

Conjugation linkers The conjugate used in the invention may include using any cross-linking

(conjugation) reagent or protocol known in the art, many of which are commercially available. Such protocols and reagents include, cross-linkers reactive with amino, carboxyl, sulfhydryl, carbonyl, carbohydrate and/or phenol groups. The amounts, times, and conditions of such protocols can be varied to optimize conjugation. Cross-linking reagents contain at least two reactive groups and are generally divided into homofunctional cross-linkers (containing identical reactive groups) and heterofunctional cross-linkers (containing non- identical reactive groups). The cross-linkers of the invention may be either homobifunctional and/or heterobifunctional. Furthermore the cross-linker may incorporate a 'spacer' between the reactive moieties, or the two reactive moieties in the cross-linker may be directly linked. Bonds may include ester bonds.

Exemplary linkers include BS³ [Bis(sulfosuccinimidyl)suberate], NHS/EDC (N-hydroxysuccinimide and N-ethyl- (dimethylaminopropyl)carbodimide, Sulfo-EMCS ([N-e-Maleimidocaproic acidjhydrazide), SATA (N-succinimidyl-S-acetylthioacetate), and hydrazide. BS³ is a homobifunctional N-hydroxysuccinimide ester that targets accessible primary amines. A conjugation scheme is exemplified in Fig. 2. NHS/EDC allows for the conjugation of primary amine groups with carboxyl groups. Sulfo-EMCS are heterobifunctional reactive groups (maleimide and NHS-ester) that are reactive toward sulfhydryl and amino groups. Amine coupling using sulfo-NHS/EDC activation may be used to cross-link therapeutic antibodies to polypeptides. The resulting conjugate is stable and retains the biological activity of the antibody. Moreover, it has a high conjugation capacity that can be reliably controlled and a low non-specific interaction during coupling procedures. SATA is reactive towards amines and adds protected sulfhydryls groups. The NHS-ester reacts with primary amines to form stable amide bonds. Sulfhydryl groups may be deprotected using hydroxylamine. Hydrazide can be used to link carboxyl groups to primary amines and may therefore be useful for linking glycoproteins.

Small molecules such as therapeutic agents can be conjugated to polypeptides (e.g., those described herein). The exemplary small molecule, paclitaxel, has two strategic positions (position C2' and C7) useful for conjugation. Conjugation of a vector or vector of the invention to paclitaxel can be performed as follows. Briefly, paclitaxel is reacted with anhydride succinic pyridine for three hours at room temperature to attach a succinyl group in position T . The 2'-succinyl paclitaxel has a cleavable ester bond in position 2' can simply release succinic acid. This cleavable ester bond can be further used for various modifications with linkers, if desired. The resulting T-O- succinyl-paclitaxel is then reacted with EDC/NHS in DMSO for nine hours at room temperature, followed by the addition of the vector or vector in Ringer/DMSO for an additional reaction time of four hours at room temperature. The reaction of conjugation depicted in Fig. 8 is monitored by HPLC. Each intermediate, such as paclitaxel, 2'-O-succinyl-paclitaxel and T- O-NHS-succinyl-paclitaxel, is purified and validated using different approaches such as HPLC, thin liquid chromatography, NMR (¹³C or ¹H exchange), melting point, mass spectrometry. The final conjugate is analyzed by mass spectrometry and SDS-polyacrylamide gel electrophoresis. This allows determining the number of paclitaxel molecules conjugated on each vector. Dosages

The dosage of any conjugate or composition described herein depends on several factors, including: the administration method, the severity of the disease, whether the cancer is to be treated or prevented, and the age, weight, and health of the subject to be treated.

With respect to the treatment methods of the invention, it is not intended that the administration of a vector, conjugate, or composition to a subject be limited to a particular mode of administration, dosage, or frequency of dosing; the invention contemplates all modes of administration. The conjugate, or composition may be administered to the subject in a single dose or in multiple doses. For example, a compound described herein or identified using screening methods of the invention may conjugate be administered once a week for, e.g., 2, 3, 4, 5, 6, 7, 8, 10, 15, 20, or more weeks. It is to be understood that, for any particular subject, specific dosage regimes should be adjusted over time according to the individual need and the professional judgment of the person administering or supervising the administration of the composition. For example, the dosage of a composition can be increased if the lower dose does not provide sufficient activity in the treatment of a disease or condition described herein (e.g., cancer). Conversely, the dosage of the composition can be decreased if the disease (e.g., cancer) is reduced or eliminated.

While the attending physician ultimately will decide the appropriate amount and dosage regimen, a therapeutically effective amount of a vector, conjugate, or composition described herein, may be, for example, in the range of 0.0035 μg to 20 μg/kg body weight/day or 0.010 μg to 140 μg/kg body weight/week. Desirably a therapeutically effective amount is in the range of 0.025 μg to 10 μg/kg, for example, at least 0.025, 0.035, 0.05, 0.075, 0.1, 0.25, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 7.0, 8.0, or 9.0 μg/kg body weight administered daily, every other day, or twice a week. In addition, a therapeutically effective amount may be in the range of 0.05 μg to 20 μg/kg, for example, at least 0.05, 0.7, 0.15, 0.2, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 10.0, 12.0, 14.0, 16.0, or 18.0 μg/kg body weight administered weekly, every other week, every three weeks or once a month. Furthermore, a therapeutically effective amount of a compound may be, for example, in the range of 0.1 mg/m² to 2,000 mg/m² administered every other day, once weekly, every other week or every three weeks. For example ANG 1005, may be administered at 50, 100, 200, 300, 400, 420, 500, 600, 650, 700, 800, or 1,000 mg/m² every one, two, three, four weeks, or every month or every other month. In one particular example, ANG 1005 is administered at 300 mg/m² or 420 mg/m² every three weeks. In another embodiment, the therapeutically effective amount is in the range of 1000 μg/m² to 20,000 μg/m², for example, at least 1000, 1500, 4000, or 14,000 μg/m² of the compound administered daily, every other day, twice weekly, weekly, or every other week.

Formulation of pharmaceutical compositions The administration of a conjugate described herein or a composition containing the conjugate may be by any suitable means that results in a concentration of the compound that treats ovarian cancer. The conjugate may be in any appropriate amount of any suitable carrier substance, and is generally present in an amount of 1-95% by weight of the total weight of the composition. The composition may be provided in a dosage form that is suitable for the oral, parenteral (e.g., intravenously or intramuscularly), rectal, cutaneous, nasal, vaginal, inhalant, skin (patch), topical, ocular, or intracranial administration route. Thus, the composition may be in the form of, e.g., tablets, capsules, pills, powders, granulates, suspensions, emulsions, solutions, gels including hydrogels, pastes, ointments, creams, plasters, drenches, osmotic delivery devices, suppositories, enemas, injectables, implants, sprays, or aerosols. The pharmaceutical compositions may be formulated according to conventional pharmaceutical practice (see, e.g., Remington: The Science and Practice of Pharmacy, 20th edition, 2000, ed. A.R. Gennaro, Lippincott Williams & Wilkins, Philadelphia, and Encyclopedia of Pharmaceutical Technology, eds. J. Swarbrick and J. C. Boylan, 1988-1999, Marcel Dekker, New York).

Pharmaceutical compositions may be formulated to release the conjugate(s) immediately upon administration or at any predetermined time or time period after administration. The latter types of compositions are generally known as controlled release formulations, which include (i) formulations that create substantially constant concentrations of the conjugate(s) within the body over an extended period of time; (ii) formulations that after a predetermined lag time create substantially constant concentrations of the conjugate(s) within the body over an extended period of time; (iii) formulations that sustain the coηjugate(s) action during a predetermined time period by maintaining a relatively constant, effective level of the conjugate(s) in the body with concomitant minimization of undesirable side effects associated with fluctuations in the plasma level of the conjugate(s) (sawtooth kinetic pattern); (iv) formulations that localize action of conjugate(s), e.g., spatial placement of a controlled release composition adjacent to or in the diseased tissue or organ; (v) formulations that achieve convenience of dosing, e.g., administering the composition once per week or once every two weeks; and (vi) formulations that target the action of the conjugate(s) by using carriers or chemical derivatives to deliver the compound to a particular target cell type. Administration of the conjugate(s) in the form of a controlled release formulation is especially preferred for conjugate(s) having a narrow absorption window in the gastrointestinal tract or a relatively short biological half-life.

Any of a number of strategies can be pursued in order to obtain controlled release in which the rate of release outweighs the rate of metabolism of the conjugate(s) in question. In one example, controlled release is obtained by appropriate selection of various formulation parameters and ingredients, including, e.g., various types of controlled release compositions and coatings. Thus, the conjugate(s) is formulated with appropriate excipients into a pharmaceutical composition that, upon administration, releases the conjugate(s) in a controlled manner. Examples include single or multiple unit tablet or capsule compositions, oil solutions, suspensions, emulsions, microcapsules, molecular complexes, microspheres, nanoparticles, patches, and liposomes.

Formulation of pharmaceutical compositions

The administration of a conjugate described herein or a composition containing the conjugate may be by any suitable means that results in a concentration of the compound that treats ovarian cancer. The conjugate may be in any appropriate amount of any suitable carrier substance, and is generally present in an amount of 1-95% by weight of the total weight of the composition. The composition may be provided in a dosage form that is suitable for the oral, parenteral (e.g., intravenously or intramuscularly), rectal, cutaneous, nasal, vaginal, inhalant, skin (patch), topical, ocular, or intracranial administration route. Thus, the composition may be in the form of, e.g., tablets, capsules, pills, powders, granulates, suspensions, emulsions, solutions, gels including hydrogels, pastes, ointments, creams, plasters, drenches, osmotic delivery devices, suppositories, enemas, injectables, implants, sprays, or aerosols. The pharmaceutical compositions may be formulated according to conventional pharmaceutical practice (see, e.g., Remington: The Science and Practice of Pharmacy, 20th edition, 2000, ed. A.R. Gennaro, Lippincott Williams & Wilkins, Philadelphia, and Encyclopedia of Pharmaceutical Technology, eds. J. Swarbrick and J. C. Boylan, 1988-1999, Marcel Dekker, New York).

Pharmaceutical compositions may be formulated to release the conjugate(s) immediately upon administration or at any predetermined time or time period after administration. The latter types of compositions are generally known as controlled release formulations, which include (i) formulations that create substantially constant concentrations of the conjugate(s) within the body over an extended period of time; (ii) formulations that after a predetermined lag time create substantially constant concentrations of the conjugate(s) within the body over an extended period of time; (iii) formulations that sustain the conjugate(s) action during a predetermined time period by maintaining a relatively constant, effective level of the conjugate(s) in the body with concomitant minimization of undesirable side effects associated with fluctuations in the plasma level of the conjugate(s) (sawtooth kinetic pattern); (iv) formulations that localize action of conjugate(s), e.g., spatial placement of a controlled release composition adjacent to or in the diseased tissue or organ; (v) formulations that achieve convenience of dosing, e.g., administering the composition once per week or once every two weeks; and (vi) formulations that target the action of the conjugate(s) by using carriers or chemical derivatives to deliver the compound to a particular target cell type. Administration of the conjugate(s) in the form of a controlled release formulation is especially preferred for conjugate(s) having a narrow absorption window in the gastrointestinal tract or a relatively short biological half-life. Any of a number of strategies can be pursued in order to obtain controlled release in which the rate of release outweighs the rate of metabolism of the conjugate(s) in question. In one example, controlled release is obtained by appropriate selection of various formulation parameters and ingredients, including, e.g., various types of controlled release compositions and coatings. Thus, the conjugate(s) is formulated with appropriate excipients into a pharmaceutical composition that, upon administration, releases the conjugate(s) in a controlled manner. Examples include single or multiple unit tablet or capsule compositions, oil solutions, suspensions, emulsions, microcapsules, molecular complexes, microspheres, nanoparticles, patches, and liposomes.

Other embodiments

All patents, patent applications, and publications mentioned in this specification are herein incorporated by reference to the same extent as if each independent patent, patent application, or publication was specifically and individually indicated to be incorporated by reference.

Claims

What is claimed is: CLAIMS

1. A method of treating a patient having a cancer that originated in the ovary, said method comprising administering to said patient an effective amount of a conjugate comprising: (a) an anticancer agent; and

(b) a polypeptide comprising an amino acid sequence at least 80% identical to TFFYGGSRGKRNNFKTEEY (SEQ ID NO:97), wherein said polypeptide is conjugated to said anticancer agent.

2. The method of claim 1, wherein said anticancer agent is selected from the group consisting of paclitaxel, vinblastine, vincristine, etoposide, doxorubicin, cyclophosphamide, taxotere, melphalan, and chlorambucil.

3. The method of claim 2, wherein said anticancer agent is paclitaxel.

4. The method of any of claims 1 -3, wherein said polypeptide comprises an amino acid sequence at least 90% identical to the sequence of SEQ ID NO:97.

5. The method of claim 4, wherein said polypeptide comprises the amino acid sequence of SEQ ID NO:97.

6. The method of claim 5, wherein said polypeptide consists of the amino acid sequence of SEQ ID NO:97.

7. The method of any of claims 1 -6, wherein said conjugate is administered in a dosage of between 100 mg/m² and 2000 mg/m².

8. The method of claim 7, wherein said conjugate is administered in a dosage of between 300 mg/m² and 1000 mg/m².

9. The method of any of claims 1-8, wherein said conjugate is administered intravenously.

10. The method of any of claims 1-9, wherein said cancer has metastasized to at least one location outside the ovary and said method is effective in treating said metastasis.

11. The method of claim 10, wherein said cancer has metastasized to at least one location outside the brain of said patient.

12. The method of claim 10, wherein said cancer has metastasized outside the pelvis of said patient.

13. The method of claim 10, wherein said cancer has metastasized to the brain, lung, liver, or a combination thereof.

14. The method of claim 10, wherein said cancer has metastasized into the lymph system.

15. The method of any of claims 1-14, wherein said cancer comprises cells determined to be drug resistant.

16. The method of claim 15, wherein said cancer cell expresses MDRl.

17. The method of claim 15-16, wherein said cells are resistant to paclitaxel treatment or to treatment with a taxane derivative.

18. The method of any of claims 1-17, wherein said method further includes administration of a second anticancer therapy.

19. The method of any of claims 1-18, wherein said patient has previously received another chemotherapeutic agent.

20. The method of claim 19, wherein said cancer is resistant to said previously received chemotherapeutic agent.

21. The method of claim 19 or 20, wherein said previously received chemotherapeutic agent is paclitaxel, a platinum-based agent, an alkylating agent, or a combination thereof.

22. The method of claim 21, wherein said platinum based agent is carboplatin or cisplatin.

23. The method of claim 21 or 22, wherein said patient previously received combination carboplatin-paclitaxel therapy.

24. The method of any of claims 1-21, wherein said cancer is an ovarian epithelial carcinoma or ovarian adenocarcinoma, or a metastatic form thereof.