FDA NEWS RELEASEFDA Approves First Intratumoral Injection to Treat Non-Metastatic Mast Cell Tumors in DogsShareTweetEmailFor Immediate Release:November 16, 2020Today, the U.S. Food and Drug Administration approved Stelfonta (tigilanol tiglate injection) to treat dogs with non-metastatic, skin-based (cutaneous) mast cell tumors (MCTs). The FDA is also approving Stelfonta to treat non-metastatic MCTs located under the dog’s skin (subcutaneous), in particular areas of a dog’s leg. Stelfonta is injected directly into the MCT (intratumoral injection). Stelfonta works by activating a protein that spreads throughout the treated tumor, which disintegrates tumor cells. Etc