PKD2 and metastatic malignant neoplasm in the lymph nodes: PKD2 status did not correlate with sex (p = 0.07), smoking (p = 0.76), alcohol consumption (p = 0.61), tumor size (p = 0.47), lymph-node metastasis (p = 0.26), distant metastasis (p = 0.12), HPV infection (p = 1.00) or PKD3 status (p = 0.61).