Masivet treatment for Mast cell tumours

Hello Vets. My friend has a 10yr old American bulldog who has several mast cell tumours. I have included photos taken in October and the more bloody ones taken today. My friend would like to try Masivet (masitinib mesilate). Can anyone advise on whether this is a good idea given the age of the dog and the advanced stage of the tumours please? Also how successful is this treatment when used at such a late stage? Thank you. I appreciate any and all input.

Hello!  I'm afraid that the person responsible for this decision is your friends' vet.  There is insufficient information here for me to contribute very much meaningful:  the fact that you know these to be mast cell tumours suggests that there have already been biopsies or aspirates and staging carried out by a vet.  This means that their vet will have more information than me (eg the lab report) and will have the best idea of how the lumps might behave after and without removal, and with or without chemotherapy, or indeed both. I therefore wonder what has led to you asking here, as I have none of these advantages?  For a true second opinion, clinicians usually send the case to a more specialised vet, working in the specific area of concern, or speak to their laboratory pathologist (pathologists often have a lot to contribute). I would suggest that as a first step, your friend is open with their vet about any concerns that they may have, and takes it from there.