EGFR and neoplasm: First, there was no information about the use of different surgical procedures (neck dissection or other) in the SEER database, or certain important clinical pathological parameters related to prognosis including vascular invasion and the surgical margin.14 Second, information about some prognostic factors such as chemotherapy and tumor markers such as EGFR, HPV, and P5333, 34, 35 is also not available.