CA9 and metastatic malignant neoplasm in the lymph nodes: Although angiogenic and hypoxic properties of the primary tumour and the lymph node metastases seem to correlate, multiple linear regression analysis withheld only size of the lymph node metastasis, TCP% of the lymph node metastasis and CA9 expression in the lymph node metastasis as factors independently determining the ECP% of the lymph node metastasis.