There were statistically significant differences in cCR rates among the following groups: tumor stage T2 - 3 (43.3%) versus T4 (0%), nodal stage N0 (100%) versus N1 (40%) and N2 (22.7%), scarbrous tumor (66.7%) versus ulcerated - scabrous tumor (20.8%), and tumor length ≤ 4 cm (72.2%) versus > 4 cm (0%) (p<0.05).