A Study of Reduced Radiation Therapy and Standard-of-Care Chemotherapy in People With HPV-Positive Throat Cancer

DIAGNOSTIC_TEST

18 F-FMISO PET/CT

The 18F-FMISO PET/CT Scan Protocol consists first of an IV bolus injection of approximately 5-10 mCi of the radiotracer. At between 150-180 mins post injection, 18F-FMISO images will be acquired.

RADIATION

Radiation

Total Radiation Dose (over 3 weeks) 30Gy\*\* in 2 Gy per fraction

DRUG

Cisplatin

Concurrent chemotherapy (2 cycles) will be given. At the start of week 1 of radiation, subjects will receive cisplatin 100 mg/m2 intravenously. They may be given for 2 consecutive days (50 mg/m2 each day for a total dose 100 mg/m2 ), typically on days 1 and 2, or as a single dose, typically on day 1.

DRUG

Carboplatin

If cisplatin cannot be given at 100 mg/m2 for either cycle 1 or cycle 2, the investigator may use a regimen with carboplatin and 5-Fluorouracil in its place. Carboplatin will be given at a dose of AUC 1.25 intravenously daily x 4 days starting on day 1 of the cycle (total dose of AUC 5). 5-Fluorouracil will be given at a dose of 600 mg/m2 intravenous infusion over 24 hours daily x 4 days (total dose of 2400 mg/m2 intravenous infusion over 96 hours). (Cohort B to start carboplatin (AUC 1.5) and paclitaxel 45 mg/m2 at the start of RT)

DRUG

5-fluorouracil

If cisplatin cannot be given at 100 mg/m2 for either cycle 1 or cycle 2, the investigator may use a regimen with carboplatin and 5-Fluorouracil in its place. Carboplatin will be given at a dose of AUC 1.25 intravenously daily x 4 days starting on day 1 of the cycle (total dose of AUC 5). 5-Fluorouracil will be given at a dose of 600 mg/m2 intravenous infusion over 24 hours daily x 4 days (total dose of 2400 mg/m2 intravenous infusion over 96 hours).

Number of participants with any locoregional recurrences

Time frame: 2 years

The primary objective of this protocol is to demonstrate that the 2 year locoregional control for these subjects treated with a major de-escalated radiation dose of 30Gy is acceptable as compared to historical locoregional control rate for subjects treated with the current standard chemoradiation at 70Gy. To examine if subjects receiving 30Gy have an acceptable treatment outcome when compared to the radiation of 70Gy both in the setting of concurrent chemotherapy, we will test the hypothesis that H0: P\<=85% vs H1: P\>85%, where P represents the 2-year locoregional control rate.

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