ICD-9, ICD-10, and CPT codes were used to search the Loma Linda University Health Cancer Registry to find patients diagnosed with HNSCC between 2006 and 2018. This study was approved by Loma Linda University Medical Center Institutional Review Board (IRB Approval #: 5180298). The following data were obtained for each patient: age, sex, smoking status, primary malignancy site, pathology report, staging, type of radiation and number of radiation treatments, chemotherapy regimen, and number of chemotherapy cycles completed. Radiation dose ranged between 48 and 72 Gy.
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