The results of immunohistochemistry were assessed by optical density (OD) and apoptosis was quantified by apoptosis index (AI). The methods of statistics adopted were analysis of variance of repeated data and t test.

• 免疫组化结果用生物医学图像分析仪行光密度分析(Optical density OD)，原位凋亡结果用凋亡指数(Apoptosis index AI)计量。