Quantitative structure-activity relationships of antitumor guanidinothiazolecarboxamides with survival enhancement for therapy in the 3LL Lewis lung carcinoma model.
Schnur RC, Gallaschun RJ, Singleton DH, Grissom M, Sloan DE, Goodwin P, McNiff PA, Fliri AF, Mangano FM, Olson TH.
Guanidinothiazolecarboxamides (GTCs) are a novel class of antitumor agents found to be systemically active against experimental pulmonary metastases of 3LL Lewis lung carcinoma. A series of substituted benzothiazole GTCs were found to produce enhancement of survival in this model by using 8 days of intraperitoneal dosing initiated 2 days after intravenous tumor challenge. Quantitative structure-activity relationships have been discovered in the GTC series with survival enhancement correlated to substituent parameters. Optimal correlations were found between the probit transform of the drug-induced increased lifespan (ILS) and field and pi parameters. Among the most effective analogues in this series was N-(5-fluorobenzothiazol-2-yl)-2-guanidinothiazole-4-carboxam ide.