6cm
3.In 15 cases,the tumor were≤0. 5 cm in diameter, 43 tumors were 0. 6cm-1. 0cm and 195 tumors were 1. 1cm-2.0cm.
10.The NED rate of the primary carcinoma ≤0. 5cm,0. 6cm-l. 0cm,and 1. 1cm-2. 0cm were 93. 3% ,81. 4% and 77. 9% respectively.

