Spontaneous tumors, including gastrointestinal neoplasms and malignant melanomas, in the syrian hamster

Abstract

HE gastrointestinal tract of experimental T animals is rarely the site oE spontaneous cancer and, with few exceptions, is quite resistant to cancer induction by various experimental methods.0T h e probable spontaneous origin of gastrointestinal cancers as well as malignant melanomas and adrenal, ovarian, and other tumors in a colony of Syrian hamsters is therefore of considerable interest. MATERIALS ASD METHODSObservations were made on 301 hamsters maintained under ordinary laboratory conditions for twenty to twenty-three and one half months.T h e animals were divided into sev-From the Andre and