Primary Objective: To determine if six (6) cycles of pembrolizumab with weekly carboplatin and paclitaxel for the 1st line treatment of metastatic head/neck squamous cell carcinoma patients increases the radiographic response rate as compared to the historical rate for pembrolizumab alone.~Secondary Objective(s):~To determine if six (6) cycles of pembrolizumab with weekly carboplatin and paclitaxel for the 1st line treatment of metastatic head/neck squamous cell carcinoma patients increases median overall survival (OS) as compared to the historical rate reported for pembrolizumab alone.~To determine if six (6) cycles of pembrolizumab with weekly carboplatin and paclitaxel followed by pembrolizumab alone for the 1st line treatment of metastatic head/neck squamous cell carcinoma patients increases the median progression-free survival (PFS) as compared to the historical rate reported for pembrolizumab alone.~To determine the toxicity profile of six (6) cycles of pembrolizumab with weekly carboplatin/paclitaxel/pembrolizumab alone for the 1st line treatment of metastatic head/neck squamous cell carcinoma patients, measured as the proportion of patients with discontinuation of any study drug due to any adverse event of any cause, as compared to the historical proportion reported for platinum/5FU/ pembrolizumab (33%).
The purpose of this research is to see what effects the treatment regimen chemotherapy (carboplatin and paclitaxel) plus immunotherapy (pembrolizumab), has on patients who have been diagnosed with head/neck squamous cell carcinoma and are unable to take the drug 5-fluorouracil