Multi-Omic Assessment of Squamous Cell Cancers Receiving Systemic Therapy

This is prospective research study which will include patients with recurrent or metastatic squamous cell carcinoma of the head and neck, esophagus and anal canal starting on first-line platinum based chemotherapy or any line of immunotherapy treatment.This study aims to characterize the dynamic changes in genomic, epigenetic, immune profiling and imaging data during treatment with systemic therapy. Patients will have archived tumor samples requested as well as blood samples collected at up to four time points to analyze these changes. Imaging data will be derived from patients' routine CT scans before and after treatment.