METHODS: The BEL7402 liver tumor cells were divided into the control, hypoxia 24 hours, hypoxia 48 hours, hypoxia plus radiation and radiation alone groups.

• 方法：将贴壁培养的肝癌细胞株BEL7402分成对照组、缺氧24h组、缺氧48h组、缺氧加照射组和单纯照射组。