Tumor growth of intramuscular hybridomas. Hybridomas were excised on day 11 of treatment and weighed. Solid circles represent the hybridoma weight from each animal. The open circles with error bars are mean ± SEM; n = 9 and n = 5, respectively, for mAb 2B5 and mAb C11C1 (P = .015). An additional 15 animals treated with mAb C11C1 had no apparent tumor growth and were not killed until day 22, at which time no tumors were found.