the incidence of rats developing one or more mammary carcinomas in each treated group was compared to that ovserved in simultaneously treated groups receiving only the carcinogen , steroid , or no treatment whatsoever , with weekly observation of all rats until palpably growing tumors were biopsied and proven carcinomatous or until death occurred from other causes determined by autopsy .
C0678222
mammary
C0006826
carcinomatous