Testing What Happens When an Immunotherapy Drug (Pembrolizumab) is Added to Radiation or Given by Itself Compared to the Usual Treatment of Chemotherapy With Radiation After Surgery for Recurrent Head and Neck Squamous Cell Carcinoma

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PRIMARY OBJECTIVES: I. To evaluate overall survival (OS) of adjuvant reirradiation plus concurrent pembrolizumab followed by pembrolizumab to complete 12 months total of pembrolizumab to adjuvant reirradiation plus concurrent platinum chemotherapy in high risk head and neck squamous cell carcinoma (...

PRIMARY OBJECTIVES: I. To evaluate overall survival (OS) of adjuvant reirradiation plus concurrent pembrolizumab followed by pembrolizumab to complete 12 months total of pembrolizumab to adjuvant reirradiation plus concurrent platinum chemotherapy in high risk head and neck squamous cell carcinoma (HNSCC) patients. II. To evaluate OS of adjuvant pembrolizumab for 12 months compared to adjuvant reirradiation plus concurrent platinum chemotherapy in high risk HNSCC patients. SECONDARY OBJECTIVES: I. To evaluate the following endpoints in all arms: disease free survival (DFS), locoregional control, rates of distant metastasis, toxicity. II. To evaluate whether high PD-L1 expression (defined as Combined Positive Score [CPS] >= 20) is predictive of increased efficacy in the experimental groups compared to control. OUTLINE: Patients are randomized to 1 of 3 arms. ARM A: Patients receive pembrolizumab intravenously (IV) over 30 minutes on day 1. Treatment repeats every 6 weeks for 9 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo intensity modulated radiation therapy (IMRT) or proton beam radiation therapy (PBRT) once daily (QD) for a total of 30 fractions in the absence of disease progression or unacceptable toxicity. ARM B: Patients receive cisplatin or carboplatin IV on day 1. Treatment repeats every 7 days for 6 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo IMRT or PBRT QD for a total of 30 fractions in the absence of disease progression or unacceptable toxicity. ARM C: Patients receive pembrolizumab IV over 30 minutes on day 1. Treatment repeats every 6 weeks for 9 cycles in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up at 30 days, and then every 6 months for up to 5 years from the date of registration

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