The early cancer rate of EMR samples and that of routine biopsy samples were 52%(16/31) and 26%(8/31), respectively( P =0.001).

• EMR标本与普通活检标本对早期癌的检出率分别是52%25和 2 6%25 (P<0 .；0 0 1 )；而且普通活检的漏检率达 50%25 (8/ 1 6病变 )。