Until the work of Stewart and Lorenz in 1942 (7), attempts at producing adenocarcinomas of the stomach by means of the carcinogens had failed. Klein and Palmer reviewed these efforts in 1941 (3). Carcinogens had been administered with the diet mixed with roughage, placed in the mouth by dropper and kept within the lumen of the stomach for some time by means of paraffin pellets. Squamous-cell ca...
