CDKN2A and metastatic malignant neoplasm in the lymph nodes: PKD3 status did not correlate with sex (p = 0.31), smoking (p = 0.90), alcohol consumption (p = 0.66), tumor size (p = 0.52), lymph-node metastasis (p = 0.21), distant metastasis (p = 0.37), p16INK4a status (p = 0.61) or HPV infection (p = 0.43).