Survival study of 86 bitches with mammary tumors treated at the Veterinary Hospital of the University Anhembi Morumbi, São Paulo, Brazil

Results Among the 154 tumors analyzed, 149 (96.7%) were neoplasms (benign and malignant) and 5 (3.3%) were nonneoplastic lesions. For statistical analysis, mongrel (30.2%) and Poodles (26.7%) were a lot more affected breeds, age between 9 and 12 years (62.8%) was the most frequent of all, 60,4% (90/149) of neoplastic formations were benign and 39,6% (59/149) were malignant. 24,4% (12/49) of all malignant tumors patients had metastasis. Dogs whose tumors were less than 4 cm had no significantly increased duration of survival with a median of 15,3 month versus 17,4 months for dogs with tumors greater than 4 centimeters (p=0,327). Dogs with metastasis lived a median of 10,7 months versus 18,3 months for dogs without them (p<0,01). Patients treated with surgery had 17,3 months of median survival rate versus surgery plus chemotherapy submitted dogs had 13,8 months (p=0,319). Dogs with malignant tumors in stage I, II, III, IV and V had, respectively, 21, 18,4 , 14,9 , 17,2 and 8,8 months of survival (p<0,01).