Evaluation of Clostridium novyi-NT spores in dogs with naturally occurring tumors
2012
Objective—To establish the maximum tolerated dose of Clostridium novyi–NT spores in tumor-bearing dogs and evaluate spore germination within tumors and tumor response. Animals—6 client-owned dogs. Procedures—A standard dose-escalation study was planned, with maximum tolerated dose defined as the highest dose at which 0 or 1 of 6 dogs had dose-limiting toxicoses (DLT). Dogs received 1 dose of C novyi–NT spores IV. Toxicoses were graded and interventions performed according to specific guidelines. Grade 3 or higher toxicosis or any toxicosis combination that substantially affected patient status was considered DLT. Clinical response was measured by use of response evaluation criteria in solid tumors at 28 days. Results—The first 2 dogs had DLT. The dose was decreased. Two of the next 4 dogs had DLT; therefore, dose administration was stopped because the study endpoint had been reached. The most common toxicosis was fever (n = 6 dogs). Two dogs developed abscesses (1 within a nasal carcinoma and 1 splenic ab...
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