Anticancer Activity of Purine Antagonists and Their Ribosides. I. Comparative Studies with 6-Mercaptopurine and 6-Mercaptopurine Riboside.

Abstract
6-Mercaptopurine riboside was assayed for inhibitory activity against adenocarcinoma 755 in mice and was found to be of approximately the same activity as 6-mercaptopurine. Lines of S. faecalis resistant to 6-mercaptopurine were cross-resistant to 6-mercaptopurine riboside. A line of adenocarcinoma 755 selected for resistance to 6-mercaptopurine showed cross-resistance to 6-mercaptopurine riboside.

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