CDKN2A and metastatic malignant neoplasm in the lymph nodes: PKD1 status did not correlate with sex (p = 0.90), smoking (p = 0.68), alcohol consumption (p = 0.75), tumor size (p = 0.52), lymph-node metastasis (p = 0.21), distant metastasis (p = 0.37), p16INK4a status (p = 0.26), HPV infection (p = 0.49) or PKD3 status (p = 0.36).