Liz Buchanan BVSc MRCVS
Hello! Stelfonta is still a relatively new treatment for Mast Cell Tumour that can not be resected surgically. I am not the best person to advise you on it as I have never used it. However, reports do sound encouraging, with 3/4 cases doing very well (obviously 1 in 4 don't). In order to understand fully what is involved, perhaps have your vet take you through the data-sheet / literature in order to make up your minds together about whether it is worth trying in this particular case.