Abnormal expression of p15INK4b has been linked to unfavorable outcome in univariate [19] and multivariate [20] analysis in patients with ovarian cancers, whereas Endo et al. [18] found that in patients with malignant peripheral nerve sheath tumors a decreased expression of p15INK4b was associated with an unfavorable prognosis. This evidence concerns the gene CDKN2B and ovarian carcinoma.