NRP1 and head and neck squamous cell carcinoma: Generally speaking, the mRNA expression of NRP1 was significantly up-regulated in seven cancer types, including kidney renal clear cell carcinoma (KIRC), stomach adenocarcinoma (STAD), cholangiocarcinoma (CHOL), head and neck squamous cell carcinoma (HNSC), liver hepatocellular carcinoma (LIHC), thyroid carcinoma (THCA), and esophageal carcinoma (ESCA).