HPV DNA-Guided Radiotherapy De-intensification of Head and Neck Squamous Cell Carcinoma

Inclusion Criteria:

1. Provision of signed and dated informed consent form

2. Stated willingness to comply with all study procedures and availability for theduration of the study

3. Male or female, ≥ 18 years of age

4. Pathologically proven diagnosis of squamous cell carcinoma of the oropharynx of anyAJCC 8th edition stage.

5. Eligible for and planning to receive definitive treatment or adjuvant treatment withradiotherapy.

6. Participants who are receiving concurrent systemic anticancer therapy (e.g.chemotherapy or immunotherapy) for oropharyngeal cancer are eligible.

7. For participants with T1-2 and N0 disease, chemotherapy is not required foreligibility. Participants may or may not receive chemotherapy per physiciandiscretion.

8. For participants with T3-4 and/or N+ disease, chemotherapy is required foreligibility.

9. Participants may receive investigational agents with prior approval from thePrincipal Investigator.

10. ECOG Performance Status of 0-2.

11. p16 positive HPV as determined by NavDx and immunohistochemistry

12. For females of reproductive potential: agreement to use adequate contraceptionduring radiation treatment and for 6 months (or more if applicable based on othermedications) after the end of radiation treatment.

Exclusion Criteria:

1. Evidence of distant metastatic disease

2. Prior history of radiotherapy to the head and/or neck

3. Had surgery for oropharyngeal cancer within 8 months of enrollment unless it was anincomplete oncologic surgery. Participant is eligible if the gross tumor was notcompletely removed.

4. Diagnosis of T3-4 and/or N+ disease with no plans to receive concurrentchemotherapy.

5. Diagnosis of a current or prior invasive malignancy (except non-melanoma skincancer) unless the participant has been disease free for at least 3 years.

6. Participant is a prisoner

7. Known contraindications to head and neck radiation therapy such as ataxiatelangiectasia or scleroderma.

8. Pregnancy or lactation

9. Active or severe co-morbidities as defined by the following:

10. Unstable angina and/or congestive heart failure requiring hospitalization up to 180 days before registration

11. Transmural myocardial infarction up to 180 days before registration

12. Acute bacterial or fungal infection requiring intravenous antibiotics at thetime of registration

13. Chronic obstructive pulmonary disease exacerbation or other respiratory illnessrequiring hospitalization or precluding study therapy at the time ofregistration

14. Hepatic insufficiency as determined by the treating clinician resulting inclinical jaundice and/or coagulation effects or severe liver dysfunction.

15. Acquired immune deficiency syndrome (AIDS) based upon current CDC definition.The need to exclude patients with AIDS from this protocol is necessary becausethe treatments involved in this protocol may be slightly immunosuppressive.Protocol-specific requirements may also exclude immuno-compromised patients.

16. Tobacco smoking history of 10 pack years or greater, or ≥ 20 pack years if smokingcessation occurred at least 1 year prior to enrollment

17. Current use of antineoplastic drugs for other malignancies.