Overexpression of p14ARF and p16INK4a has also been found in invasive areas of head and neck squamous cell carcinoma (Natarajan et al., 2003), colorectal carcinoma (Jung et al., 2001) and endometrial carcinoma (Horrée et al., 2007). This evidence concerns the gene CDKN2A and endometrial carcinoma.