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Holtermann, N.; Kiupel, M.; Kessler, M.; Teske, E.; Betz, D. and Hirschberger, J. (2016): Masitinib monotherapy in canine epitheliotropic lymphoma. In: Veterinary and Comparative Oncology, Vol. 14: pp. 127-135

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This study evaluated efficacy and side effects of masitinib in canine epitheliotropic lymphoma. Complete remission occurred in 2 of 10 dogs and lasted for median 85 days. Five dogs went into partial remission for median 60.5 days. Three pretreated dogs did not respond to therapy. Side effects occurred in six dogs and were mostly mild to moderate. Immunohistochemistry was available for eight dogs. KIT receptor was negative in all of them, six of eight lymphomas stained strongly positive for stem cell factor (SCF). platelet-derived growth factor (PDGF)-AA was weakly positive in two and negative in six. PDGF-BB was negative in four tumours, weakly positive in one and strongly positive in three. One was strongly positive for PDGF receptor (PDGFR)-beta, seven were negative for that receptor. Five showed strong expression of PDGFR-alpha, two showed weak expression, one was negative. In conclusion, masitinib is effective in treating canine epitheliotropic lymphoma. But its effects are most likely not generated through the KIT receptor.

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