Nab-Paclitaxel in Combination With Nivolumab to Treat Recurrent or Metastatic Head and Neck Squamous-Cell Carcinoma That Progressed on a PD-1 or PD-L1 Inhibitor

Inclusion Criteria: * Histologically or cytologically confirmed recurrent or metastatic HNSCC of the oral cavity, larynx, hypopharynx, oropharynx, or p16 positive neck node with unknown primary (but clinically thought to be oropharynx). * Known p16 status (positive or negative) if oropharynx or unknown primary of the neck. * Measurable disease per RECIST. Measurable disease defined as lesions that can be accurately measured in at least one dimension (longest diameter to be recorded) as ≥ 10 mm with CT scan, as ≥ 20 mm by chest x-ray, or ≥ 10 mm with calipers by clinical exam. * Progression of disease, as assessed by RECIST, that occurred on a PD-1 or PD-L1 inhibitor (given alone or with other therapy) to treat recurrent or metastatic disease. Progression of disease that occurred on a PD-1 or PD-L1 inhibitor given as a component of a curative-intent regimen is excluded. * PD-L1 CPS by IHC (22C3 antibody) on tumor tissue is strongly encouraged to be available or performed, although the test result is not required to enroll onto the trial. Patients with tumor PD-L1 TPS (but not CPS) available are also eligible; but, PD-L1 CPS should be performed in these cases. Fresh tumor tissue (obtained after progression on prior PD-1 or PD-L1 inhibitor given for recurrent or metastatic disease) is strongly preferred, but archived tumor tissue from recurrence or initial diagnosis is also acceptable. * At least 18 years of age. * ECOG performance status \< 1 * Normal bone marrow and organ fun…