Fig. 2

Apoptosis of tumor cells in primary and recurrent tumor samples. The apoptotic index is shown as the mean ± SD. Detection by TUNEL assay demonstrated a marked appearance of dark brown apoptotic cells in several primary (A) and recurrent (B) tumor samples. The apoptotic index was low in the two types of tumor samples, with no statistically significant difference between the two groups (P > 0.05) (C)