Patent Application
20070249651
The present invention relates to the field of cancer treatment and provides an antitumor composition comprising a substituted acryloyl distamycin derivative, more particularly an α-bromo- or α-chloro-acryloyl distamycin derivative, and a topoisomerase inhibitor of type I or II, having a synergistic antineoplastic effect.
Distamycin A and analogues thereof, hereinafter referred to as distamycin and distamycin-like derivatives, are known in the art as cytotoxic agents useful in antitumor therapy.
Distamycin A is an antibiotic substance with antiviral and antiprotozoal activity, having a polypyrrole framework [Nature 203: 1064 (1964); J. Med. Chem. 32: 774-778 (1989)]. The international patent applications WO 90/11277, WO 98/04524, WO 98/21202, WO 99/50265, WO 99/50266 and WO 01/40181 (claiming priority from British patent application No. 9928703.9), all in the name of the applicant itself and herewith incorporated by reference, disclose acryloyl distamycin derivatives wherein the amidino moiety of distamycin is optionally replaced by nitrogen-containing ending groups such as, for instance, cyanamidino, N-methylamidino, guanidino, carbamoyl, amidoxime, cyano and the like, and/or wherein the polypyrrole framework of distamycin, or part of it, is replaced by varying carbocyclic or heterocyclic moieties.
The present invention provides, in a first aspect, a pharmaceutical composition for use in antineoplastic therapy in mammals, including humans, comprising a pharmaceutically acceptable carrier or excipient;
The present invention includes, within its scope, the pharmaceutical compositions comprising any of the possible isomers covered by the compounds of formula (I), both considered separately or in admixture, as well as the metabolites and the pharmaceutically acceptable bio-precursors (otherwise known as pro-drugs) of the compounds of formula (I).
In the present description, unless otherwise specified, with the term distamycin or distamycin-like framework R2 we intend any moiety structurally closely related to distamycin itself, for instance by optionally replacing the ending amidino moiety of distamycin and/or its polypyrrole framework, or part of it.
Topoisomerase I and II inhibitors are known in the art as described in various scientific publications.
The main representatives for topoisomerase I inhibitors are camptothecin derivatives such as, for instance, CPT-11, Topotecan, 9-amino-camptothecin, 9-nitro-camptothecin and 10,11 -methylenedioxy-camptothecin.
Among the topoisomerase II inhibitors are, in particular, the anthracycline derivatives such as doxorubicin, daunorubicin, epirubicin, nemorubicin and idarubicin; the podophyllotoxin compounds etoposide and teniposide; the anthraquinone derivative like mitoxantrone and losoxantrone; the acridine derivatives like amsacrine and actinomaycin D. See, for a reference, Cancer, Principles and Practice of Oncology, Lippincott-Raven Ed. (1997), 452-467.
According to a preferred embodiment of the invention, herewith provided are the above pharmaceutical compositions wherein the topoisomerase inhibitors are topoisomerase II inhibitors, in particular doxorubicin and etoposide.
According to another preferred embodiment of the invention, herewith provided are the above pharmaceutical compositions wherein, within the acryloyl distamycin derivative of formula (I), R1 has the above reported meanings and R2 is a group of formula (II) below:
In the present description, unless otherwise specified, with the term C1-C4 alkyl or alkoxy group we intend a straight or branched group selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy or tert-butoxy.
Even more preferred are the pharmaceutical compositions of the invention comprising the above acryloyl distamycin derivative of formula (I) wherein R1 is bromine or chlorine; R2 is the above group of formula (II) wherein r is 0, m is 0 or 1, n is 4 and B has the above reported meanings.
Still more preferred, within this class, are the pharmaceutical compositions comprising the compounds of formula (I) wherein R1 is bromine or chlorine; R2 is the above group of formula (II) wherein r is 0, m is 0 or 1, n is 4, X and Y are both CH groups and B is selected from:
Pharmaceutically acceptable salts of the compounds of formula (I) are those with pharmaceutically acceptable inorganic or organic acids such as, for instance, hydrochloric, hydrobromic, sulfuric, nitric, acetic, propionic, succinic, malonic, citric, tartaric, methanesulfonic, p-toluenesulfonic acid and the like.
Examples of preferred acryloyl distamycin derivatives of formula (I), within the compositions object of the invention, optionally in the form of pharmaceutically acceptable salts, preferably with hydrochloric acid, are:
10. N-{5-[({5-[({5-[({3-[(aminocarbonyl)amino]propyl}amino)carbonyl]-1-methyl-1H-pyrrol-3-yl}amino)carbonyl]-1-methyl-1H-pyrrol-3-yl}amino)carbonyl]-1-methyl-1H-pyrrol-3-yl}-4-[(2-bromoacryloyl)amino]-1-methyl-1H-pyrrole-2-carboxamide.
The above compounds of formula (I), either specifically identified as such or by means of the general formula, are known or easily prepared according to known methods as reported, for instance, in the aforementioned international patent applications WO 90/11277, WO 98/04524, WO 98/21202, WO 99/50265, WO 99/50266 and WO 01/40181.
The present invention further provides a product comprising an acryloyl distamycin derivative of formula (I), as defined above, and an antineoplastic topoisomerase I or II inhibitor, as a combined preparation for simultaneous, separate or sequential use in antitumor therapy.
A further aspect of the present invention is to provide a method of treating a mammal, including humans, suffering from a neoplastic disease state, which method comprises administering to said mammal the above acryloyl distamycin derivative of formula (I) and an antineoplastic topoisomerase I or II inhibitor, in amounts effective to produce a synergistic antineoplastic effect.
The present invention also provides a method for lowering the side effects caused by antineoplastic therapy with an antineoplastic agent in a mammal in need thereof, including humans, the method comprising administering to said mammal a combined preparation comprising an antineoplastic topoisomerase I or II inhibitor and an acryloyl distamycin derivative of formula (I), as defined above, in amounts effective to produce a synergistic antineoplastic effect.
By the term “synergistic antineoplastic effect”, as used herein, it is meant the inhibition of the growth tumor, preferably the complete regression of the tumor, by administering an effective amount of the combination comprising an acryloyl distamycin derivative of formula (I) and a topoisomerase I or II inhibitor to mammals, including humans. By the term “administered” or “administering”, as used herein, it is meant parenteral and/or oral administration; the term “parenteral” means intravenous, subcutaneous and intramuscular administration.
In the method of the present invention, the acryloyl distamycin derivative may be administered simultaneously with the compound having topoisomerase I or II inhibitory activity, for example with a compound of the camptothecin, anthracycline, mitoxantrone, epipodophyllotoxin, or acridine class. Alternatively, both compounds may be administered sequentially in either order.
In this respect, it will be appreciated that the actual preferred method and order of administration will vary according to, inter alia, the particular formulation of the acryloyl distamycin of formula (I) being used, the particular formulation of the topoisomerase I or II inhibitor being used, for instance the camptothecins such as CPT-11, topotecan, 9-AC; the anthracyclines such as doxorubicin, daunorubicin, epirubicin, idarubicin, nemorubicin; the anthraquinones such as mitoxantrone and losoxantrone; the epipodophyllotoxins such as etoposide, teniposide; the acridine derivatives such as amsacrine and actinomycin D , the particular tumor model being treated as well as the particular host being treated.
To administer the acryloyl distamycin derivative of formula (I), according to the method of the invention, the course of therapy generally employed comprises doses varying from about 0.05 to about 100 mg/m2 of body surface area and, more preferably, from about 0.1 to about 50 mg/m2 of body surface area.
For the administration of the topoisomerase I or II inhibitor, according to the method of the invention, the course of therapy generally employed comprises
The antineoplastic therapy of the present invention is particularly suitable for treating breast, ovary, lung, colon, kidney, stomach, pancreas, liver, melanoma, leukemia and brain tumors in mammals, including humans.
In a further aspect, the present invention is directed to the preparation of a pharmaceutical composition comprising an effective amount of an acryloyl distamycin derivative of formula (I), as defined above, and an antineoplastic topoisomerase I or II inhibitor, in the preparation of a medicament for use in the prevention or treatment of metatasis or in the treatment of tumors by inhibition of angiogenesis.
As stated above, the effect of an acryloyl distamycin derivative of formula (I) and a topoisomerase I or II inhibitor, such as an anthracycline or etoposide derivative, is significantly increased without a parallel increase of toxicity. In other words, the combined therapy of the present invention enhances the antitumoral effects of the acryloyl distamycin derivative and of the topoisomerase I or II inhibitor and, hence, provides the most effective and least toxic treatment for tumors.
The superadditive effects of the combined preparations of the invention are shown, for instance, by the following in vivo tests, which are intended to illustrate the present invention without posing any limitation to it.
Table 1 shows the antileukemic activity on disseminated L1210 murine leukemia obtained by combining N-(5-{[(5-{([(5-{([(2-{[amino(imino)methyl]amino}ethyl)amino]carbonyl}-1-methyl-1H-pyrrol-3-yl)amino]carbonyl}-1-methyl-1H-pyrrol-3-yl)amino]carbonyl}-1-methyl-1H-pyrrol-3-yl)-4-[(2-bromoacryloyl)amino]-1-methyl-1H-pyrrole-2-carboxamide hydrochloride, as a representative compound of formula (I)—internal code PNU 166196, with doxorubicin. At the dose of 10 mg/kg of doxorubicin alone (day+1 after tumor injection and 2 hours after PNU 166196 administration) and at the dose of 0.52 mg/kg of PNU 166196 alone (days+1) were associated, without toxicity, ILS % values of 58 and 33, respectively. Combining doxorubicin and PNU 166196 at the same doses with the same schedule, an increase of activity with ILS % value of 100 was observed, thus indicating a synergistic effect.
1L1210 leukemia cells (105/mouse CD2F1) are injected IV on Day 0.
2Treatment is given IV.
3Increase in life span: [(median survival time of treated mice/median survival time of controls) × 100] − 100.
4Number of toxic deaths/number of mice.
(*)doxorubicin was administered 2 h after PNU 166196 administration.
For these experiments, PNU 166196 and doxorubicin were solubilized in water for injection.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10297915 | Dec 2002 | US |
| Child | 11821333 | Jun 2007 | US |
