Objective To investigate the effects of hematoporphyrin derivative(HPD) in different concentrations on photodynamic therapy for human esophageal cancer cell line Eca-109 in vitro at various time points.

• 目的:探讨血卟啉衍生物(hematoporphyrin derivative,HPD)孵育浓度和孵育时间对人食管癌细胞Eca-109体外光动力疗法(photodynamic therapy,PDT)效应的影响。