Caspase 3-activation and PARP cleavage were observed after mTHPC-PDT under comparable conditions by other groups, e.g., in human breast carcinoma cell line MCF-7 (1.5 μM, 0.01–0.06 J/cm2) [16] and HT29 adenocarcinoma cells (1.5–4.5 μM, 0.3–1.9 J/cm2) [48,49]. Here, CASP3 is linked to adenocarcinoma.