KDR and squamous cell carcinoma: This is also in contrast to a prior study from our laboratory on non-small cell lung carcinoma tissues, in which VEGFR2 expression was a more frequent finding both in pulmonary adenocarcinomas and squamous cell carcinomas [14] and far more frequent tumor cell expression of VEGFR2 protein in squamous cell carcinomas from other sites like cervix and head and neck (unpublished observations).