My husband was diagnosed with mucosal melanoma in his right sinus cavity. He had two surgeries to remove the tumor and part of the tumor was embedded in his skull base. He is now having proton radiation treatments (33) that are targeted into the sinus cavity and his neck lymph nodes. After he completes the proton treatment, he will have immunotherapy infusions for a long period of time. We have nothing solid yet on what drug will be used or the length of treatment. It is essential that you have an accurate diagnosis of your tumor and a doctor who is experienced in the sinus area. We have found it difficult to find research dealing with rare sinus tumors. I believe the key is to find a doctor to help with that. Someone who has experience with sinus tumors.