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Effect of 1,3-Diallylurea and Related Compounds on Growth of Transplanted Animal Tumors¹

Sloan-Kettering Institute for Cancer Research and Sloan-Kettering Division, Graduate School of Medical Sciences, Cornell University Medical College, New York, New York 10021

The antitumor activity of a group of N-substituted derivatives of urea was investigated in a spectrum of 1 rat and 8 mouse tumors. Repeated i.p. injections of 1,3-diallylurea significantly retarded Carcinoma C1025 and Ridgway osteogenic sarcoma and produced borderline, antitumor effects in 2 other mouse tumors. 1,1-Diallylurea inhibited 2 tumors, but monoallylurea and 1,3-diallylthiourea were inactive. 1,3-Diallylurea against susceptible tumors was characterized by activity over a wide range of nontoxic doses and was independent of the route of administration. Incubation of fragments of susceptible tumors in solutions of 1,3-diallylurea diminished their ability to grow following s.c. implantation.

Comparison of the 13 substituted ureas revealed that antitumor activity was limited to those compounds having a molecular structure with 2 allyl groups.

¹ Supported in part by Contract SA-43-ph-2445 from the Cancer Chemotherapy National Service Center, National Cancer Institute, USPHS and in part by Grant CA-08748 from the National Cancer Institute.

Received 10/14/66. Accepted 2/ 2/67.