Sorry to hear this, I can sense your pain and deep frustration I had father who had simple tumor and was ignored for years, he died because of ignorant doctors. I googled days before (searching cure for leukoplakia) about complex case of oral cancer treated succesfully (for time being) with Immiquimod. The patient in this case was too fragile due to advanced age for conventional treatment and doctors went with Immiquimod therapy.

[Topical imiquimod for the palliative treatment of recurrent oral squamous cell carcinoma]

https://pmc.ncbi.nlm.nih.gov/articles/PMC5517834/