Patient characteristics
There were 93 patients (91 men, 2 women), the median age was 65 years (range: 54 to 69 years), and 52 patients (55.9%) had anterior commissure invasion (Table 1). The median post-surgical follow-up time was 82 months (range: 20 to 138 months). Fifty-four patients (58%) were smokers and 49 (53%) drank alcohol. Tumor stage classification indicated that 62 patients (66.7%) had stage T1a and 31 (33.3%) had stage T1b. Sixty-five patients (69.9%) received RFA and 28 (30.1%) patients received open surgery.