Preclinical activity of an i.v. formulation of rubitecan in IDD-P against human solid tumor xenografts.

Abstract:

:An i.v. formulation of rubitecan (9-nitrocamptothecin) was evaluated in five human solid tumor xenograft models. Rubitecan in IDD-P, a particulate suspension of the insoluble analog, produced significant tumor growth delay in athymic nude mice bearing A375 melanoma, and MX-1 breast, SKMES non-small-cell lung, Panc-1 pancreatic and HT29 colon carcinomas. The activity of i.v. rubitecan was similar or somewhat superior to those of i.p. regimens with the reference drugs, irinotecan and topotecan. Tumor sensitivity to rubitecan in IDD-P was MX-1>A375>SKMES >Panc-1>HT29. Some complete regression responses were seen with MX-1, A375 and SKMES tumors treated with 2.5 mg/kg on a schedule of two 5-day dosing cycles separated by 2 drug-free days. In nude mice, the MTD of rubitecan in IDD-P lies between 2 and 2.5 mg/kg on this schedule; antitumor efficacy was achieved with doses between 2.5 and 1.25 mg/kg. Dosing with 6.6 mg/kg rubitecan in IDD-P on intermittent schedules (4- or 7-day intervals) was tolerated, but less efficacious, when tested in the A375 model. The good responses obtained with rubitecan in IDD-P suggest it could be used clinically in circumstances where an i.v. formulation offers advantages to oral or aerosol formulations.

journal_name

Anticancer Drugs

journal_title

Anti-cancer drugs

authors

Sands H,Mishra A,Stoeckler JD,Hollister B,Chen SF

doi

10.1097/00001813-200210000-00009

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

965-75

issue

9

eissn

0959-4973

issn

1473-5741

journal_volume

13

pub_type

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