Inventors:
William W. Lee - Palo Alto CA
J. Martin Brown - Stanford CA
Edward W. Grange - Palo Alto CA
Abelardo P. Martinez - San Jose CA
Michael Tracy - Palo Alto CA
Daniel J. Pollart - Menlo Park CA
Assignee:
SRI International - Menlo Park CA
International Classification:
A61K 3153
US Classification:
514243, 5142325, 5142342, 514 84
Abstract:
A method of using 1,2,4-benzotriazine oxides, some of which are novel compounds, as radiosensitizers and selective cytotoxic agents is disclosed. These compounds are shown to specifically radiosensitive hypoxic tumor cells. Some are additionally disclosed to be useful as specific cytotoxic agents for these cells. They also show an unexpected ability to radiosensitize aerobic cells following or preceding a hypoxic incubation of the cells with the drug. This provides a basis for selective radiosensitization of tumors compared to normal cells. A novel method for preparing the 1,2,4-benzotriazine oxides is also disclosed.