[Experimental data on the effect of chalone on tumor growth]. / Eksperimental'nye dannye o vliianii keilona na opukholevyi rost.

Hepatic chalone produced an inhibitory effect on Zajdela's hepatoma and was followed by a longer survival of the host, adrenaline potentiating that effect.

[Experimental study of chloroprene for carcinogenicity]. / Eksperimental'noe izuchenie khloroprena na kantserogennost'.

Chloroprene (2-chlorobutidiene 1,3) is an intermediate chemical product derived in the process of obtaining synthetic rubber. Chloroprene was shown by the experiments on mice and rats to be not carcinogenic. The application of chloroprene in animals by skin smears, subcutaneous injections, per os and intratracheal administration failed to induce any tumors in the experimental animals. No tumors were observed also in animals after using its combination with very small doses of dimethylbenz (a) anthracene.