Overexpression of VEGFR2 has been associated with increased metastasis in several malignancies [174, 175], and VEGFR2 expression has also been shown on squamous cell carcinomas of the head and neck [176], colorectal cancer [177, 178], breast cancer [179, 180], and NSCLC [181–183]. Here, KDR is linked to squamous cell carcinoma.