Major De-escalation to 30 Gy for Select Human Papillomavirus Associated Oropharyngeal Carcinoma

The purpose of this study is to demonstrate that participants with HPV positive and hypoxia negative T1-2, N1-2c (AJCC, 7th ed.) oropharyngeal squamous cell carcinoma receiving a major de-escalated radiation therapy with 2 cycles of standard chemotherapy is not inferior to comparable subjects treated with the current standard chemoradiation. Accrual for Cohort A has been completed. Cohort B is active and continues to enroll participants where surgery is optional and proton is allowed.

This non-randomized non-inferiority study will enroll HPV associated oropharyngeal carcinoma subjects. Subjects who also have no evidence of hypoxia will undergo a major de-escalated radiation therapy concurrent with standard chemotherapy. Hypoxia status will be determined by 1 BF-FMISO PET /CT imaging. If this baseline scan shows no evidence of hypoxia, the subject will receive 30Gy concurrent with 2 cycles of chemotherapy. If this baseline scan shows evidence of hypoxia, a repeat 1 BF-FMISO scan will be done 5-10 treatment days after start of radiation therapy. If the repeat 1 BF-FMISO scan PET /CT demonstrates no evidence of hypoxia, the subject will receive 30Gy concurrent with 2 cycles of chemotherapy. If the repeat 1 BF-FMISO scan PET /CT demonstrates hypoxia, the subject will receive 70Gy concurrent with 2 cycles of chemotherapy. At 4 (+/- 4 weeks) months after chemoradiation, a neck dissection will be done unless the subjects FDG PET /CT scan at that time shows no evidence of disease of which the subject can be observed as per current standard of care.