Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
  • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
  • A61K51/04—Organic compounds
  • A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
  • A61K51/10—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody
  • A61K51/1027—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody against receptors, cell-surface antigens or cell-surface determinants
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
  • C07K16/2887—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against CD20
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
  • C07K16/2896—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against molecules with a "CD"-designation, not provided for elsewhere
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
  • G01N33/5091—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing the pathological state of an organism
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
  • G01N33/5094—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for blood cell populations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies

Definitions

• the present invention reports new clinical parameters for predicting the hematological toxicity which can be expected upon administering a therapeutic radiolabeled anti-CD20 antibody, as well as other therapeutic antibodies which have the potential to target immune cells.
• the clinical parameters of the present invention are useful alternatives to performing dosimetry trials with gamma- emitting radiolabeled antibodies prior to therapy.
• the immune system of vertebrates (for example, primates, which include humans, apes, monkeys, etc.) consists of a number of organs and cell types which have evolved to: accurately and specifically recognize foreign microorganisms ("antigen") which invade the vertebrate-host; specifically bind to such foreign microorganisms; and, eliminate/destroy such foreign microorganisms.
• antigen foreign microorganisms
• Lymphocytes are critical to the immune system. Lymphocytes are produced in the thymus, spleen and bone marrow (adult) and represent about 30% of the total white blood cells present in the circulatory system of humans (adult) . There are two major sub-populations of lymphocytes: T cells and B cells.
• T cells are responsible for cell mediated immunity, while B cells are responsible for antibody production (humoral immunity).
• T cells and B cells can be considered interdependent — in a typical immune response, T cells are activated when the T cell receptor binds to fragments of an antigen that are bound to major histocompatability complex ("MHC") glycoproteins on the surface of an antigen presenting cell; such activation causes release of biological mediators ("interleukins”) which, in essence, stimulate B cells to differentiate and produce antibody (“immunoglobulins”) against the antigen.
• MHC major histocompatability complex
• interleukins biological mediators
• Each B cell within the host expresses a different antibody on its surface- thus one B cell will express antibody specific for one antigen, while another B cell will express antibody specific for a different antigen.
• B cells are quite diverse, and this diversity is critical to the immune system.
• each B cell can produce an enormous number of antibody molecules (i.e., about 10 7 to 10 8 ).
• Such antibody production most typically ceases (or substantially decreases) when the foreign antigen has been neutralized.
• proliferation of a particular B cell will continue unabated; such proliferation can result in a cancer referred to as "B cell lymphoma.
• T cells and B cells both comprise cell surface proteins which can be utilized as “markers” for differentiation and identification.
• One such human B cell marker is the human B lymphocyte-restricted differentiation antigen Bp35, referred to as "CD20.”
• CD20 is a B-lymphocyte-restricted differentiation antigen that is expressed during early pre-B-cell development and remains until plasma cell differentiation. It is believed by some that the CD20 molecule may regulate a step in the B-cell activation process which is required for cell cycle initiation and differentiation. Moreover CD20 is usually expressed at very high levels on neoplastic (“tumor”) B-cells. The CD20 antigen is appealing for targeted therapy, because it does not shed, modulate, or internalize.
• the CD20 surface antigen is an attractive candidate for "targeting" of B cell lymphomas.
• targeting can be generalized as follows: antibodies specific to the CD20 surface antigen of B cells are, e.g. , injected into a patient. These anti-CD20 antibodies specifically bind to the CD20 cell surface antigen of (ostensibly) both normal and malignant B cells; the anti-CD20 antibody bound to the CD20 surface antigen may lead to the destruction and depletion of neoplastic B cells. Additionally, chemical agents or radioactive labels having the potential to destroy the tumor can be conjugated to the anti-CD20 antibody such that the agent is specifically "delivered" to, e.g., the neoplastic B cells. Irrespective of the approach, a primary goal is to destroy the tumor: the specific approach can be determined by the particular anti-CD20 antibody which is utilized and, thus, the available approaches to targeting the CD20 antigen can vary considerably.
• Murine (mouse) monoclonal antibody 1F5 an anti-CD20 antibody
• 1F5 an anti-CD20 antibody
• Extremely high levels ( > 2 grams) of 1F5 were reportedly required to deplete circulating tumor cells, and the results were described as being "transient.
• Press et al. "Monoclonal Antibody 1F5 (Anti-CD20) Serotherapy of Human B-Cell Lymphomas," Blood 69/2:584-591 (1987).
• a potential problem with this approach is that non-human monoclonal antibodies (e.g.
• murine monoclonal antibodies typically lack human effector functionality, i.e., they are unable to, inter alia, mediate complement dependent lysis or lyse human target cells through antibody dependent cellular toxicity or Fc- receptor mediated phagocytosis.
• non-human monoclonal antibodies can be recognized by the human host as foreign proteins; therefore, repeated injections of such foreign antibodies can lead to the induction of immune responses leading to harmful hypersensitivity reactions.
• HAMA Human Anti-Mouse Antibody response
• these "foreign" antibodies can be attacked by the immune system of the host such that they are, in effect, neutralized before they reach their target site.
• ERT radioimmunotherapy
• the local emission of ionizing radiation of radiolabeled antibodies may kill cells with or without the target antigen (e.g., CD20) in close proximity to antibody bound to the antigen; penetrating radiation, i.e., beta emitters, may obviate the problem of limited access to the antibody in bulky or poly vascularized tumors; and, the total amount of antibody required may be reduced, thereby alleviating the severity of the potential HAM A response.
• target antigen e.g., CD20
• penetrating radiation i.e., beta emitters
• Radiolabeled antibodies include the use of a radioactive substance which may require the need for precautions for both the patient (i.e., possible bone marrow transplantation) as well as the health care provider (i.e., the need to exercise a high degree of caution when working with radioactivity).
• U.S. applications 08/475,813, 08/475,815 and 08/478,967, herein incorporated by reference, disclose radiolabeled therapeutic antibodies for the targeting and destruction of B cell lymphomas and tumor cells.
• the Y2B8 antibody is disclosed, which is an anti-human CD20 murine monoclonal antibody, 2B8, attached to yttrium-[90] ( 90 Y) via the bifunctional chelator, MX- DTPA.
• This radionuclide was selected for therapy for several reasons.
• the 64 hour half-life of ⁇ Y is long enough to allow antibody accumulation by the tumor and, unlike e.g.
• 131 I is a pure beta emitter of high energy with no accompanying gamma irradiation in its decay, with a range of 100 to 1000 cell diameters.
• the minimal amount of penetrating radiation allows for outpatient administration of 90 Y-labeled antibodies.
• internalization of labeled antibodies is not required for cell killing, and the local emission of ionizing radiation should be lethal for adjacent tumor cells lacking the target antigen.
• Patents relating to chelators and chelator conjugates are known in the art.
• U.S. Patent No. 4,831,175 of Gansow is directed to polysubstituted diethylenetriaminepentaacetic acid chelates and protein conjugates containing the same, and methods for their preparation.
• U.S. Patent Nos. 5,099,069, 5,246,692, 5,286,850, and 5,124,471 of Gansow also relate to polysubstituted DTPA chelates. These patents are incorporated herein in their entirety.
• the specific bifunctional chelator used to facilitate chelation in applications 08/475,813, 08/475,815 and 08/478,967 was selected as it possesses high affinity for trivalent metals, and provides for increased tumor-to-non-tumor ratios, decreased bone uptake, and greater in vivo retention of radionuclide at target sites, i.e. , B-cell lymphoma tumor sites.
• target sites i.e. , B-cell lymphoma tumor sites.
• other bifunctional chelators are known in the art and may also be beneficial in tumor therapy.
• U.S. Application Serial No. 08/475,813 discloses sequential administration of Rituxan ® with yttrium-labeled Y2B8 murine monoclonal antibody.
• the radiolabeled antibody used in this combined therapy is a murine antibody
• initial treatment with chimeric anti-CD20 sufficiently depletes the B cell population such that the HAMA response is decreased, thereby facilitating a combined therapeutic and diagnostic regimen.
• U.S. application no. 09/259,337 discloses methods, reagents and kits for accomplishing radiolabeling of antibodies. Such kits are convenient vehicles for placing these reagents in the clinical setting, in a way that they may be easily produced and administered to the patient before significant decay of the radiolabel or significant destruction of the antibody due to the radiolabel occurs.
• the kits disclosed in application no. 09/259,337, herein incorporated by reference, overcome many deficiencies of the prior art which deterred the introduction of such convenient means to commercialize this valuable technology.
• radiolabeling kits to the market may have been due to the poor incorporation efficiencies demonstrated by some known labeling protocols, and the subsequent need to column purify the reagent following the radiolabeling procedure.
• the delay in development of such kits might also in part be due to the previous lack of accessibility to pure commercial radioisotopes which may be used to generate efficiently labeled products absent subsequent purification.
• the reason such kits are generally unavailable is the actual lack of antibodies which have been able to achieve either the approval or the efficacy that Rituxan ® has achieved for the treatment of lymphoma in human patients.
• radiolabeled proteins may be inherently unstable, particularly those labeled with radiolytic isotopes such as ⁇ Y, which have the tendency to cause damage to the antibody the longer they are attached to it in close proximity.
• radiolysis causes unreliable efficiency of the therapeutic due to loss of radiolabel and/or reduced binding to the target antigen, and may lead to undesired immune responses directed at denatured protein.
• clinicians have had no choice but to order therapeutic antibodies already labeled, or have them labeled off site at a related facility and transported in following labeling for administration to the patient.
• kits of the invention disclosed in U.S. application no. 09/259,337 allow rapid labeling which may be affected in approximately a half an hour or as little as five minutes depending on the label.
• kit protocols disclosed in this application have a labeling efficiency of over 95 % thereby foregoing the need for further purification. By foregoing the need for further purification, the half-life of the radiolabel and the integrity of the antibody is reserved for the therapeutic purpose for which it is labeled.
• ⁇ Y beta-emitting radioisotopes
• ⁇ Y cannot be used for imaging purposes due to the lack of gamma radiation associated therewith.
• a diagnostic "imaging" radionuclide such as m In
• indium-labeled antibody enables dosimetric assessment to be made, which is generally believed to be required before ⁇ Y- labeled antibodies are used due to their relatively high potency and tendency to be absorbed in the bones.
• U.S. Patent No. 5,843,398 of Kaminski et al. discloses a method of administering 90 Y-labeled antibodies to a patient having lymphoma, but maintains that dosimetry is required for 90 Y.
• Kaminski uses a n 'In-labeled antibody prior to administering the 90 Y-labeled antibody, despite acknowledging that some inaccuracy is anticipated due to the different pharmacokinetic characteristics of the radioisotopes.
• the Kaminski patent suggests that dose escalation of 90 Y-labeled antibodies may also be performed in a cautious progression to minimize the chances of irreversible toxicities.
• the present invention provides new clinical parameters for assessing the hematological toxicity of radiolabeled antibodies for a particular patient prior to administration.
• Such clinical parameters are particularly convenient for predicting the toxicity of ⁇ Y-labeled antibodies, and particularly those which target molecules on the surface of cancerous cells, particularly B cells, and which are used to treat lymphoma or leukemia, such as anti-CD20, anti-CD 19 antibodies or anti-CD22 antibodies.
• the disclosed parameters have surprisingly provided a more accurate prediction of the risk of bone marrow ablation than standard dosimetry, and may be used to measure the need for bone marrow harvest and transplantation prior to immunotherapy.
• the present invention encompasses methods of predicting the severity of hematologic toxicity which would result from administration of a radiolabeled antibody to a cancer patient, particularly patients having B cell lymphoma, and using such a prediction to deter or decrease such hematological toxicity prior to administering the radiolabeled antibody. For instance, it has been found that two clinical parameters in particular, baseline platelet count and degree of bone marrow involvement, were better predictors of hematological toxicity in non- Hodgkins B cell lymphoma patients than were dosimetry parameters.
• the methods of predicting, then deterring, the toxicity of radioimmunotherapeutics disclosed herein may comprise a variety of steps, including: (a) measuring the degree of bone marrow involvement in a baseline biopsy or baseline platelet count; and (b) administering a therapeutically effective amount of unlabeled chimeric or human antibody if said baseline bone marrow involvement is higher than 5 % such that said bone marrow involvement is decreased to less than 5% .
• 08/475,813, herein incorporated by reference discloses sequential administration of Rituxan ® (chimeric anti-CD20 antibody) with yttrium-labeled Y2B8 murine monoclonal antibody, and discloses that the chimeric antibody may be used to deplete the B cell population prior to administration of the radiolabeled antibody, thereby facilitating a combined therapeutic and diagnostic regimen.
• the present inventors have surprisingly found that such administration of unlabeled antibody prior to radiolabeled antibody is also effective to reduce the bone marrow involvement in patients having elevated levels of cancerous cells in the marrow such that these patients may be better candidates for radioimmunotherapy.
• the depleting antibodies which may be used in the present invention include unlabeled antibodies and preferably unlabeled anti-CD20 antibodies in the context of B cell lymphoma, wherein said anti-CD20 antibody is a human, chimeric or humanized antibody.
• said antibody is a chimeric or human anti-CD20 antibody, and preferably, that chimeric anti-CD20 antibody is Rituximab ® .
• antibodies directed to other B cell surface molecules may be used so long as such cell surface molecules are expressed on the surface of malignant cells.
• anti-CD19 and anti-CD22 antibodies may also be used.
• chimeric anti-CD20 antibody is administered at a dosage of at least 50 mg/m 2 at least one time, and more preferably at a dosage of at least 50 mg/m 2 weekly for at least two weeks. Most preferred dosages range from about 100 to about 500 mg/m 2 weekly for at least two weeks, and particularly include the dosage regimen of about 375 mg/m 2 weekly for four weeks.
• the methods of the present invention may be described as improved methods of treating a patient having B cell lymphoma with a therapeutic radiolabeled antibody, where said improvements include: (a) using a baseline bone marrow biopsy and/or baseline platelet counts as indications of hematological toxicity; and (b) administering a therapeutically effective amount of radiolabeled antibody based on the initial percentage of bone marrow involvement or baseline platelet counts.
• the improved methods of the present invention may further comprise administering a dosage or dosage regimen of unlabeled antibody before the radiolabeled antibody if the initial percentage of bone marrow involvement suggests that there will be hematologic toxicity, particularly if the level of bone marrow involvement is greater than 5%, more particularly 15%, and most particularly if the level of bone marrow involvement is greater than 25 % .
• any antibody which targets a cell surface molecule which is present on the surface of malignant cells may be used to deliver the radioisotope, preferably said radiolabeled antibody binds to a B cell surface molecule.
• an anti-CD20 antibody wherein said radiolabeled anti-CD20 antibody is labeled with an alpha- or beta-emitting isotope.
• Most preferred isotopes are beta-emitting isotopes due to the range and potency of the decay particles.
• Preferred beta-emitters include ⁇ Y and 131 I, although ⁇ Y is preferred over 131 I, which also emits some gamma irradiation. ⁇ Y also delivers more energy than does 131 I (2.3 MeV versus 0.81 MeV) and has a longer path length (5-10 mm versus 1-2 mm), which is beneficial for the treatment of bulkier disease where antibody binding to cells on the outer edge of a tumor may kill cells within the tumor without being bound to the surface.
• Other radionuclides suitable for use in the present invention include I88 Re and 186 Re, 199 Au and 67 Cu.
• U.S. Patent No. 5,460,785 provides a listing of suitable radioisotopes and is herein
• a preferred radiolabeled antibody to be used in the present invention is Y2B8, which is a murine anti-CD20 antibody conjugated to ⁇ Y by a bifunctional chelator.
• the preparation and use of Y2B8 is disclosed in U.S. applications 08/475,813, 08/475,815 and 08/478,967 which are herein incorporated by reference.
• murine antibodies are generally preferred over chimeric antibodies for administering a radioisotope to a human patient due to their relatively shorter half-life, human, chimeric, domain-deleted or humanized antibodies may also be used as the radio immunotherapeutic. Such antibodies may require different dosages depending on the conjugated radiolabel and their stability in vivo.
• an important goal of the methods of the present invention is to utilize unlabeled tumor cell-targeting antibodies to deplete tumor cells located in the bone marrow of patients seeking to undergo radioimmunotherapy.
• a therapeutically effective amount of unlabeled antibody to be used in the disclosed methods is an amount which is effective to decrease bone marrow involvement below a specified level.
• the unlabeled antibodies of the present invention are administered if said baseline bone marrow involvement is higher than 15% such that said bone marrow involvement is decreased to less than 15% . More particularly, the unlabeled antibodies of the present invention are administered if said baseline bone marrow involvement is higher than 25 % such that said bone marrow involvement is decreased to less than 25 % .
• the unlabeled antibodies of the present invention are administered if said baseline bone marrow involvement is higher than 25% such that said bone marrow involvement is decreased to less than 15%, and most preferably to less than 5% .
• Actual numeric doses will depend on the sensitivity of the patient, the type of antibody to be used, the antigen being targeted, and the level of bone marrow involvement and baseline platelet counts.
• Another goal of the methods of the present invention is to enable treatment of a cancer patient, and particularly patients having B cell lymphoma, with a radiolabeled immunotherapeutic antibody such that prior imaging or classical dosimetry is not required.
• the clinical parameters disclosed herein may be substituted for such dosimetry evaluations, and are actually better predictors of the hematological toxicity which can be expected upon administering a radiolabeled antibody to a particular patient than are dosimetry estimates performed with indium- [111] -labeled antibodies.
• Such methods are particularly useful when used in conjunction with the radiolabeling methods and kits disclosed in U.S. application Serial No. 09/259,337, which facilitate rapid labeling and convenient administration of radiolabeled antibodies without prior purification.
• Radiolabeled antibody Dosage amounts of radiolabeled antibody will of course depend upon the particular patient, the particular antibody, the particular target, and the particular radiolabel. Also pertinent is the extent of initial bone marrow involvement and the efficacy of the prior treatment with unlabeled depleting antibody. But for 90 Y- labeled anti-CD20 antibody and particularly Y2B8, preferred dosages will range from about 0.1 to 0.5 mCi/kg. Appropriate dosages for any particular antibody may be determined through routine optimization by the skilled practitioner. The methods of the present invention will benefit patients with any type of cancer which may involve the penetration of malignant cells into the bone marrow, i.e.
• the targeted tumor cells may include any cells which have the capability of infiltrating the bone marrow, including T cells and B cells.
• the clinical parameters disclosed herein would likely also indicate the extent of bone marrow toxicity experienced by antibodies labeled with other cytotoxic moieties, e.g. toxins.
• the parameters disclosed herein may also be used to predict and deter toxicity and bone marrow ablation due to administration of cytotoxic antibodies.
• the methods of the present invention may be used to treat a variety of cancers, particularly B cell lymphomas and leukemias, but are particularly useful wherein said B cell lymphoma is non-Hodgkin's lymphoma (NHL).
• the lymphomas which are treatable by the methods of the present invention include low grade/ follicular non-Hodgkin's lymphoma (NHL), small lymphocytic (SL) NHL, intermediate grade/ follicular NHL, intermediate grade diffuse NHL, chronic lymphocytic leukemia (CLL), high grade immunoblastic NHL, high grade lymphoblastic NHL, high grade small noncleaved cell NHL, bulky disease NHL, mantle cell lymphoma, AIDS-related lymphoma and Waldenstrom's Macroglobulinemia, or any type of lymphoma that is potentially accompanied by bone marrow involvement which could complicate the efficacy of radioimmunotherapy.
• NHL low grade/ follicular non-Hodgkin's lymphoma
• SL small lymphocytic
• NHL intermediate grade/ follicular NHL
• intermediate grade diffuse NHL intermediate grade diffuse NHL
• CLL chronic lymphocytic leukemia
• high grade immunoblastic NHL high grade lymphoblastic NHL
• a phase I/II study was performed with Y2B8 involving fifty-eight relapsed or refractory non-Hodgkins lymphoma (NHL) patients (6% small lymphocytic, 65 % follicular, 24% DLC & DMC, 6% mantle cell). All patients underwent imaging and dosimetry with ⁇ 'In-labeled antibody (In2B8) (also disclosed in applications 08/475,813, 08/475,815 and 08/478,967, herein incorporated by reference) one week prior to therapy.
• Rituximab ® 250 mg/m 2 was given prior to both imaging and therapeutic radiolabeled antibodies.
• Treatment was given to 50 Group 2 and 3 patients as outpatient single-dose 0.2, 0.3 or 0.4 mCi/kg.
• Phase II doses of 0.4 mCi/kg and 0.3 mCi/kg for patients with mild thrombocytopenia (platelets 100-150/mm 3 ) were chosen.
• Analysis of bone marrow dosimetry including whole blood Tl/2 and AUC, blood- and sacral-derived bone marrow dosimetry) versus grade hematologic toxicity for Phase II patients receiving 0.4 mCi/kg or 0.3 mCi/kg did not demonstrate a significant correlation.

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