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Promising novel drug for canine lymphoma
Lymphomas belong to the most common malignant multicentric neoplasias. A variety of chemotherapeutic protocols is currently recommended. In this study, 9-aminocamptothecin was used as a 72-h infusion with promising results.

A colloidal dispersion formulation of 9-aminocamptothecin (9-AC) was administered intravenously to 10 dogs with previously untreated, spontaneously occurring, multicentric lymphoma. The dogs received a 72-h infusion of 9-AC at a rate of 46.5-51.25 Āµg m2 h1 (total dose range 3.35-3.69 mg m2). This dose range was associated with myelosuppression, consisting principally of neutropenia with a nadir at 7 days following the start of infusion.

Neutropenia and thrombocytopenia were the most common toxicoses and are most likely to be dose-limiting toxicities; low-grade gastrointestinal signs were rarely seen. Concentrations of 9-AC lactone, as well as clinical toxicities, compare favourably with those found in humans.

Tumour responses were seen in all treated dogs. Response to other chemotherapy, following cessation of 9-AC treatment, was not obviously compromised even in dogs clinically resistant to 9-AC. 9-AC is a novel treatment drug for canine lymphoma, which appears to show great promise.

Source: Moore, A. S., Imondi, A. R., de Souza, P. L. & Wood, C. A. (2003): Intravenous administration of 9-aminocamptothecin to dogs with lymphoma. In: Veterinary and Comparative Oncology 1 (2), 86-93.




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SMALL ANIMAL PRACTICE

Proteasome inhibitors for canine and human osteosarcomamembers
Osteosarcoma, a common malignancy in large dog breeds, typically metastasises from long bones to lungs and is usually fatal within 1 to 2ā€‰years of diagnosis. Better therapies are needed for canine patients and their human counterparts, a third of whom die within 5 years of diagnosis. The authors compared the in vitro sensitivity of canine osteosarcoma cells derived from 4 tumours to the currently used chemotherapy drugs doxorubicin and carboplatin, and 4 new antiā€cancer drugs.

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