COTC trial in soft tissue sarcomas, oral melanomas, head and neck carcinomas, and mammary carcinomas: This trial is to investigate the use of iniparib, a drug used to treat various cancers in humans, in dogs. Multiple visits to the hospital are required for drug administration and serial blood and tumor samples over the course of 15-22 days. At the end of the study, $1000 is credited to your pet's account in order to further treat the tumor.