Potent and Highly Selective Hypoxia-Activated Achiral Phosphoramidate Mustards as Anticancer Drugs
摘要:
A series of achiral hypoxia-activated prodrugs were synthesized on the basis of the DNA cross-linking toxin of the prodrug, ifosfamide. The hypoxia-selective cytotoxicity of several of the compounds was improved over previously reported racemic mixtures of chiral bioreductive phosphorami date prodrugs. Prodrugs activated by 2-nitroimidazole reduction demonstrated up to 400-fold enhanced cytotoxicity toward H460 cells in culture under hypoxia versus their potency under aerobic conditions. Compounds were further assessed for their stability to cytochrome P450 metabolism using a liver microsome assay. The 2-nitroimidazole containing lead compound 3b (TH-302) was selectively potent under hypoxia and stable to liver microsomes. It was active in an in vivo MIA PaCa-2 pancreatic cancer orthotopic xenograft model as a monotherapy and demonstrated dramatic efficacy when used in combination with gemcitabine, extending survival with one of eight animals tumor free at day-44. Compound 3b has emerged as a promising antitumor agent that shows excellent in vivo efficacy and is currently being evaluated in the clinic.
Phosphoramidate alkylator prodrugs can be used to treat cancer when administered alone or in combination with one or more other anti-neoplastic agents.
ADMINISTRATION OF HYPOXIA ACTIVATED PRODRUGS AND ANTIANGIOGENIC AGENTS FOR THE TREATMENT OF CANCER
申请人:Threshold Pharmaceuticals, Inc.
公开号:EP2593139B1
公开(公告)日:2017-08-23
TREATMENT OF BLOOD CANCER
申请人:Curd Karen
公开号:US20130296273A1
公开(公告)日:2013-11-07
Hypoxia activated prodrugs, such as, e.g., TH-281, TH-302, and TH-308, are useful for the treatment of various blood cancers, such as acute leukemias, chronic leukemias, MDS, MF, and multiple myeloma.