CDKN2A and thyroid gland undifferentiated (anaplastic) carcinoma: The expression of the CDKN2A (cyclin-dependent kinase inhibitor 2A, which is associated with anaplastic thyroid cancer [33]) gene was twice higher in patients with cervical lymph node metastases (p = 0.00014) and 3.3-fold higher in patients having a high recurrence risk than those having a low risk (p = 0.0012).