The doctor who did the biopsy asked if she had been tested for HPV, but he didn't identify that as the cause. As far as I know she doesn't have HPV, but I'm just now learning that she had never been required to have Pap Smear so I doubt she's been tested.

Sister, 18yr old, diagnosed with oral tongue cancer 10/08/13
Total Glossectomy and neck dissection 11/18/13 (saved the back left portion of her tongue base only)
Forearm flap reconstruction
Trache and NG feeding tube after surgery (both removed now)
Tumor 6.7 cm
All lymph nodes tested came back negative for cancer
Radiation- 30 treatments (ending 2/18/14)
3/20/14 Recurrence- tumors in both lungs; likely metastasis