Alyssa Ettinger

CONFLICT OF INTEREST STATEMENT The authors declare no conflicts of interest. Cell lines were not used in this study and so no validation was necessary. As this was a retrospective study, approval through a regulatory agency was not necessary. REFERENCES 1. Tumors of the skin and subcutaneous tissues. In: SJ Withrow, DM Vail, RL Page, eds. Withrow and Macewen's Small Animal Clinical Oncology. 5th ed. Saunders; 2013: 305-320. 2, . Mast cell tumors. In: SJ Withrow, DM Vail, RL Page, eds.