CA2103708C - Treatment of ovarian cancer - Google Patents

Abstract

A method of treating ovarian cancer in a human afflicted therewith which comprises administering to such human an effective amount of a compound of the water soluble camptothecin analog class.

Description

2 ~ ~ ~ "~ ~ ~ ~ PCT/US92/01028~
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TREATMENT OF OVARIAN CANCER
This invention relates to a method of treating ovarian cancer in a human afflicted therewith which comprises administering to such human an effective amount of a compound of the water soluble camptothecin analog class, such as topotecan.
The structure of the DNA helix within eukaryotic cells imposes certain topological problems that the cellular apparatus must solve in order to use its genetic material as a template. The separation of the DNA strands is fundamental to cellular processes such as DNA replication and transcription. Since 2U eukaryotic DNA is organized into chromatin by chromosomal proteins, the ends are constrained and the strands cannot unwind without the aid of enzymes that alter topology. It has long been recognized that the advancement of the transcription or replication complex along the DNA helix would be facilitated by a swivel point which would relieve the torsional strain generated during these processes.
Topoisomerases are enzymes that are capable o altering DNA topology in eukaryotic cells. They are critical for important cellular functions and cell proliferation. There are two classes of topoisomerases in eukaryotic cells, type I and type II.
Topoisomerase I is a monomeric enzyme of approximately 100,000 molecular weight. The enzyme binds to DNA and introduces a-transient single--strand break, unwinds the double helix (or allows it to unwind), and subseauently reseals the break before SiJBSTITUTE SHEET

dissociating from the DNA strand.
Camptothecin, a water-insoluble alkaloid produced by trees indigenous to China ancL India, and a few other congeners thereof, are the only class of compounds known to inhibit topoisomerase I.
Camptothecin and other topoisom~erase I
inhibiting congeners have not proven to be attractive for clinical drug development as cytalytic agents because of lack of clinical efficacy, unacceptable dose-limiting toxicity, unpredictable toxicity, poor aqueous solubility, and/or unacceptable shelf life stability.
Therefore, there is a need for i:opoisomerase I
inhibiting agents which avoid the aforementioned undesirable features of camptothecin and related topoisomerase I inJzibiting congeners. Topotecan,-or any compound of the water soluble camptothecin analog class, is a specific inhibitor of DNA topo9.somerase I which fulfills such need.
SCT~ARY O~' THE TN~NTTON
This invention relates to a method of treating ovarian cancer in a human afflicted therewith which comprises administering to such human an effective amount of a compound of the water soluble camptothecin analog class.
This invention also relates to a method of treating ovarian c<3ncer in a human afflicted therewith which comprises administering to such human an effective amount of topotecan.
~j,j~~ DESCRTPTION OF THE INV:ENTT_ON
By the term "a compound of the water soluble camptothecin analog class" is meant any compound claimed in U.S. Patent Number 5,004,758, The preparation of any compound of the water soluble camptothecin analog class (including pharmaceutically acceptable salts, hydrates and solvates thereof) as well as the preparation of oral and parenteral pharmaceutical WO 92/14469 ~ PCT/US92/01028 compositions comprising a compound of the water soluble camptothecin analog class and an inert, pharmaceutically acceptable carrier or diluent, is extensively described in U.S. Patent Number 5,004,758. The same extensive S description is found in European Patent Application Number 88311366.9, published on June 21, 1989 as Publication Number EP 0 321 122.
Preferred compounds of the water soluble camptothec:in analog class include those compounds of the formula:
R
O
~B C
p E O
----.a~' s OH O
wherein: ' a) X is hydroxy and R is trimethylammoniumma_thyl;
b) X is hydroxy and R is N-methylpiperazinylmethyl;
c) X is h,ydroxy and R is N-rnethylanilinomethyl;
d) X is r.ydroxy and R is cyclohc~xylaminomethyl;
e) X is r.ydroxy and R is N,N-dimethylaminoethyloxymethyl;
f) X is hydroxy and R is cyclopropylaminome~hyl;
g) X is r.ydroxy and R is morpho:linomethyl;
h) X is r.ydroxy and R is aminomethyl; and i) X .is hydroxy and R is cyanomc~thyl; and j) X is r.ydroxy and R is dimethylaminomethyl or any pharmaceutically acceptable salts, hydrates and solvates thereof.
Topotecan is the most preferred compound of the water soluble campi~othecin analog c:Lass. By the term WO 92/14469 ' ~ ' , ~, ~ ~ ~ J ri ~ ~ PCT/US92/01028 - 9 1_ t ,; t "topotecan~~ as used herein is meant the compound of the formula:
OH
CH3 .
N~CH3 I A B~~~ ,. , N ~D
E O
O
(S)-9-dimethylaminomethyl-10-hydroxycamptothecin and any pharmaceutically acceptable salt, hydrate or solvate thereof. Topotecan's chemical name is (S)-10[(dimethylamino)methyl]-4-ethyl-4,9-dihydroxy-1H-pyrano[3',4':6,7)indolizino[1,2-bJquinolone-3,19(9H,12H)-dione.
Topotecan is water-soluble by virtue of the presence of the basic side-chain at position 9 which forms salts with acids. Preferred salt forms of topotecan include the hydrochloride salt, acetate salt and methanesulfonic acid salt. A alkali metal salt form of the carboxylate formed on alkaline hydrolysis of the E-ring lactone of topotecan would also yield a soluble salt, such as the sodium salt.
The preparation of topotecan (including pharmaceutically acceptable salts, hydrates and solvates thereof) as well as the preparation of oral and parenteral pharmaceutical compositions comprising topotecan and an inert, pharmaceutically acceptable carrier or diluent, is extensively described in U.S.
Patent Number 5,009,758. The same extensive description is found in European Patent Application Number 88311366.4, published on June 21, 1989 as Publication Number EP 0 321 122.
This invention relates to a method of treating SUBSTITUTE SHEET

WO 92/14469 ~ °'' ~ ~ r~ ~ ~ PCT/US92/01028 ;, -5-ovarian cancer in a human afflicted therewith which comprises administering to such human ari~effective amount of a compound of the water soluble camptothecin analog class. One preferred aspect of this invention relates to a method of treating ovarian cancer in a human afflicted therewith which comprises administering to such human an effective amount of topotecan.
By the term "ovarian cancer" as used herein is meant adenocarcinoma of the ovary.
By the term "treating ovarian cancer" as used herein is meant the inhibition of the growth of ovarian cancer cells. Preferably such treatment also leads to the regression of tumor growth, i.e., the decrease in size of a measurable tumor. Most preferably" such treatment leads to the complete regression of the-tumor.
By the term "administering" is meant parenteral or oral administration. By "parenteral" is meant intravenous, subcutaneous and intramuscular administration.
By the term "effective amount of a compound of the water soluble camptothecin analog class" and "effective amount of topotecan" as used herein is meant a course of therapy which will result in treating ovarian cancer. It will be appreciated that the actual preferred course of therapy will vary according to, lriter 3lis~~ the mode of administration, the particular formulation of a compound of the water soluble camptothecin analog class (such as topotecan) being utilized, the mode of administration and the particular host being treated. The optimal course of therapy for a given set of conditions can be ascertained by those skilled in the art using conventional course of therapy determination tests in view of the information set out herein, as well as the information outlined in U.S.
Patent Number 5,004,758. The same information is found in European Patent Application Number 88311366.4, published on June 21, 1989 as Publication Number EP 0 SUBSTITUTE SHEET

4~t69 210 ~ rl U. ~ ~ PCT/US92/01028 321 122.
For parenteral administration of a compound of the water soluble camptothecin analog class, the course of therapy generally employed is from about 0.5 to about 25.0 mg/m2 of body surface area per day for about one to about five consecutive days. More preferably, the course of therapy employed is from about 1.0 to about 2.5 mg/m2 of body surface area per day for about five consecutive days. Most preferably, the course of therapy employed is from about 1.5 to about 2 mg/m2 of body surface area per day for about five consecutive days. Preferably, the course of therapy is repeated at least once at about a seven day to about a twenty=eight day interval (from the date of initiation of, therapy) depending upon the initial dosing schedule and the patient's recovery of normal tissues. Most preferably, the course of therapy continues to be repeated based on tumor response.
Preferably, the parenteral administration will be by short (e.g., 30 minute) or prolonged (e.g., 24 hour) intravenous infusion. More preferably, the topotecan will be administered by a 30 minute intravenous infusion.
At this time, it is believed that the most preferred course of parenteral therapy to be employed with topotecan for a previously non-treated or lightly pretreated patient is an initial course of therapy of 1.5 mg of topotecan/m2 of body surface area per day administered by short intravenous infusion for five consecutive days.. When the patient has recovered sufficiently from the drug.-related effects of this initial course, an additional course of therapy of 2.0 mg of topotecan/m2 of body surface area per day is administered by short intravenous infusion for five consecutive days, to be repeated based on tumor response.
At this time, it is believed that the most SUBS T iTUTE SHEET

w WO 92/14409 ? ~ ~ ~ ~~~ PCT/US92/Oi028 i~;:<, - 7 -preferred course of parenteral therapy to be employed with topotecan for a heavily pretreated patient is an initial course of therapy of 1.0 mg of topotecan/m2 of body surface area per day~administered by short intravenous infusion for five consecutive days. When the patient has recovered sufficiently from the drug-related effects of this initial course, an additional course of therapy of 1.5 mg of topotecan/m2 of body surface area per day is administered by short intravenous infusion for five consecutive days, such course of therapy to be repeated based on tumor response.
For oral administration of a compound of the water soluble camptothecin analog class, the~course of therapy generally employed is from about 1.0 to about 50.0 mg/m2 of body surface area per day for about one to five consecutive days. More preferably, the course of therapy employed is from about 1.5 to about 5.0 mg/m2 of body surface area per day for about five consecutive days, Preferably, the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval (from the date of initiation of therapy) depending upon the initial dosing schedule and the patient's recovery of normal tissues. Most preferably, the course of therapy continues to be repeated based on tumor response.
Clin;ca? pharma ~t~ ca? Tnfo mar;nn Topotecan is currently undergoing Phase I
clinical investigation. The following pharmaceutical information is being supplied to the clinicians:
How ~pp?~d_ - As a vial containing 5 mg (of the base) with 100 mg mannitol. The pH is adjusted to 3.0 with HC1/NaOH. Lyophilized powder is light yellow in color. Intact vials should be stored under refrigeration (2-8 degrees Centigrade).
So ~ ion parar;nn -When t~e 5 mg vial is reconstituted with 2 ml of Sterile Water for Injection, SUBSTITUTE SHE~~

WO 92/14469 .
~..~~:1~ ~r ~ ~ PCT/US92/01028 _ . 8 _ :;
USP, each ml will contain 2.5 mg of topotecan as the base and 50 mg of mannitol, USP. Topotecan must not be diluted or mixed with buffered solutions because of solubility and stability considerations.
Stab,'_1_,'_r,~ - Shelf life surveillance of the intact vials is ongoing. Because the single-use lyophilized dosage form contains no antibacterial preservatives, it is advised that the reconstituted solution be discarded eight hours after initial entry into the vial. Futher dilutions of the reconstituted solution to concentrations of 0.02 mg/ml and 0.1 mg. ml in 5% Dextrose Injection, USP, ("D5W") or 0.9o Sodium Chloride Injection, USP, ("NS") in plastic bags stored at room temperature yielded the following stability results: -C.oncent_rat,_' on Diluent Tim (h ~) 0.02 mcr/m1 0.1 mq/ml D5w 0 100.00 100.00 6 99.29 99.68 29 102.30 98.16 48 101.98 97.91 NS 0 100.00 100.00 6 98.58 97.71 24 96.01 98.30 48 102.03 98.35 Topotecan diluted in saline (10 ug/ml or 500 ug/ml) or dextrose (6.7 ug/ml or 330 ug/ml) is stable in a hang-bag for 24 hours with at least 95o recovery.
Srea~mept dog - The treatment dose is to be diluted in a final volume of 150 ml of Sodium Chloride Injection, USP (without preservatives) and administered over a 30 minute period. The treatment dose is to be kept under refrigeration and protected from light and it is to be used within 24 hours.
L~t~'~; v One human patient with ovarian cancer, who was SUgSTSTUTE SMEET

wo 9zilaa69 H ~ ~ '° .~ ~ ~ PCT/US92/0102&
_ g -refractory to two previous platinum-containing regimens (i.e., cisplatin-cyclophosphamide combination regimen and treatment with single agent carboplatin), received a course of therapy comprising intravenous administration of 1.5 mg of topotecan/m2 of body surface area per day for five consecutive days. This course of therapy was repeated weekly nine more times to date at twenty-one day intervals (from the date of initiation of therapy) for a total of ten treatments. Tumor size regression was evaluated by CAT (computerized axial tomography) scan. Tumor size regression was observed following two courses of therapy of the above-outined treatment regimen. An even greater response was observed following four courses. At least until the tenth treatment, this clinically significant response was sustained, i.e., a greater than fifty percent (50%) tumor size regression was obtained.
SUBSTITUTE SMEET

Claims (25)

What is claimed is :

1. The use of a compound of the formula:
wherein:
a) X is hydroxy and R is trimethylammoniummethyl;
b) X is hydroxy and R is N-methylpiperazinylmethyl;
c) X is hydroxy and R is N-methylanilinomethyl;
d) X is hydroxy and R is cyclohexylaminomethyl;
e) X is hydroxy and R is N, N-dimethylaminoethyloxymethyl;
f) X is hydroxy and R is cyclopropylaminomethyl;
g) X is hydroxy and R is morpholinomethyl;
h) X is hydroxy and R is aminomethyl;
i) X is hydroxy and R is cyanomethyl; or j) X is hydroxy and R is dimethylaminomethyl or any pharmaceutically acceptable salts, hydrates and solvates thereof, to treat ovarian cancer.

2. The use of a compound of the formula:
wherein:
a) X is hydroxy and R is trimethylammoniummethyl;
b) X is hydroxy and R is N-methylpiperazinylmethyl;
c) X is hydroxy and R is N-methylanilinomethyl;
d) X is hydroxy and R is cyclohexylaminomethyl;

e) X is hydroxy and R is N,N-dimethylaminoethyloxymethyl;
f) X is hydroxy and R is cyclopropylaminomethyl;
g) X is hydroxy and R is morpholinomethyl;
h) X is hydroxy and R is aminomethyl;
i) X is hydroxy and R is cyanomethyl; or j) X is hydroxy and R is dimethylaminomethyl or any pharmaceutically acceptable salts, hydrates and solvates cancer.

3. The use of claim 1 or 2 wherein the use is oral.

4. The use of claim 1 or 2 wherein the use is parenteral.

5. The use of Claim 4 wherein the course of therapy employed is from about 0.5 to about 25.0 mg/m2 of body surface area per day for about ones to about five consecutive days.

6. The use of Claim 5 wherein the course of therapy employed is from about 1.0 to about 2.5 mg/m2 of body surface area per day for about five consecutive days.

7. The use of Claim 6 wherein the course of therapy employed is from about 1.5. to about 2mg/m2 of body surface area per day for about five consecutive days.

8. The use of Claim 5 wherein the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval.

9. The use of Claim 6 wherein the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval.

10. The use of Claim 7 wherein the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval.

11. The use of Claim 4 wherein the administration is via short or long intravenous infusion.

12. The use of Claim 11 wherein the administration is via a 30 minute intravenous infusion.

13. The use of Claim 11 wherein the administration is via a 24 hour intravenous infusion.

14. The use of Claim 4 wherein the course of therapy employed is from about 1.0 to about 50.0 mg/m2 of body surface area per day for about one to about five consecutive days.

15. The use of claim 14 wherein the course of therapy employed is from about 1.5 to about 5.0 mg/m2 of body surface area per day for about five consecutive days.

16. The use of claim 14 wherein the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval.

17. The use of Claim 15 wherein the course of therapy is repeated at least once at about a seven day to about a twenty-eight day interval.

18. The use of Claim 1 wherein the compound is topotecan.

19. The use of claim 11 wherein the compound is topotecan.

20. A pharmaceutical composition for use in the treatment of ovarian cancer in a human afflicted therewith comprising a compound of the formula:
a) X is hydroxy and R is trimethylammoniummethyl;
b) X is hydroxy and R is N-methylpiperazinylmethyl;
c) X is hydroxy and R is N-methylanilinomethyl;
d) X is hydroxy and R is cyclohexylaminomethyl;
e) X is hydroxy and R is N,N-dimethylaminoethyloxymethyl;
f) X is hydroxy and R is cyclopropylaminomethyl;
g) X is hydroxy and R is morpholinomethyl;
h) X is hydroxy and R is aminomethyl;
i) X is hydroxy and R is cyanomethyl; or j) X is hydroxy and R is dimethylaminomethyl or any pharmaceuticaly acceptable salts, hydrates and solvates thereof and a suitable pharmaceutical carrier thereof.

21. The composition of Claim 20 which is adapted for oral use.

22. The composition of Claim 20 which is adapted for parenteral use.

23. The composition of Claim 20 wherein the compound is topotecan.

24. The composition of Claim 21 wherein the compound is topotecan.

25. The composition of Claim 22 wherein the compound is topotecan.