Hello Bellarte, Welcome. I am not an expert but I am going to guess that your dad has a different kind of cancer on his tongue. Most of the time it is Squamous Cell Carcinoma (SCC). It is possible that the chemo he is getting would not have any effect on SCC. The additional biopsy will provide the pathologist with a larger sample to make a good diagnosis. Sometimes they will remove all of the lesion at the same time. Lets hope this is a very early cancer which means he will be OK.

There are some folks here who keep track of the various cancer centers and locations, hopefuly they will fill you in.

Mark, 21 Year survivor, SCC right tonsil, 3 nodes positive, one with extra-capsular spread. I never asked what stage (would have scared me anyway) Right side tonsillectomy, radical neck dissection right side, maximum radiation to both sides, no chemo, no PEG, age 40 when diagnosed.