Induction Chemotherapy With Afatinib, Ribavirin, and Weekly Carboplatin/Paclitaxel for Stage IVA/IVB HPV Associated Oropharynx Squamous Cell Cancer (OPSCC)

Patients will receive oral daily afatinib (days 1 - 21, per dose escalation scheme) plus daily oral ribavirin (days 1- 21) and paclitaxel (80 mg/m2 intravenously, days 1 and 8) + carboplatin (AUC 1.5 intravenously, days 1 and 8) of a 21-day cycle. Ribavirin will be administered according to standard weight-based dosing for this drug (1). Subjects ≤75 kg receive Ribavirin 400 mg PO qAM and 600 mg PO qPM (= 1000 mg/day). Subjects \> 75 kg receive Ribavirin 600 mg PO BID (=1200 mg/day). During the Dose Escalation portion of the study (Part 1), research bloodwork for pharmacokinetics is performed on days 1 and 8 of Cycle 1 only.