CIP2A and head and neck squamous cell carcinoma: CIP2A is expressed in only very few normal tissues but it is overexpressed with very high incidence (40–80%) in various human cancer types such as head and neck squamous cell carcinomas (HNSCC), colon carcinomas, gastric carcinomas, breast carcinomas and non-small cell lung cancer [20], [22], [23],[24],[25].