PRIMARY RIB TUMORS IN 54 DOGS

Fifty-four dogs with primary tumors of the rib were evaluated. Thirty- four dogs had osteosarcomas, 15 dogs had chondrosarcomas, three dogs h ad hemangiosarcomas, and two dogs had fibrosarcomas. Forty-nine dogs h ad en bloc excision. Within the osteosarcoma group, nine animals recei ved postoperative adjuvant chemotherapy These animals had significantl y longer median disease-free intervals (225 days) and median survival times (240 days) than dogs with osteosarcoma treated by surgery alone (median disease-free interval, 60 days; median survival, 90 days). Cho ndrosarcoma had a better prognosis (median disease-free interval, 1,08 0 days, median survival, 1,080 days) than osteosarcoma, hemangiosarcom a, or fibrosarcoma of the rib. Age, weight, sex, number of ribs resect ed, tumor volume, and total cisplatin dose did not influence survival nor disease-free interval.