Table 1.

Patients characteristics

	Male	Female
Mass	309	149
Lymph Nodes	188	393
Both sites	368	495
Stage IIIB	152	197
Stage IV	813	840
Mean Age	60.8	60
Mean PY	60.5	60.2

Mass: biopsy only at the tumor; Lymph nodes: biopsy only in lymph nodes next to the tumor site; Both: biopsy in central mass and lymphnodes