Does someone go through chemotherapy for a benign tumor?

No: Chemotherapy is not recommended for benign lesions. The major reason is that the chemo is direacted to various regions of the cancer cell to interfer in metabolic pathways by altering gere and nuclear DNA function. Even when optimally functioning because of toxicity and additional side effects use should be limited. Malignant stem cells resistent to chemo regrow to reappear in original field.