Chlorin e6 (Ce6) is a photosensitizer. It is active against S. aureus, P. aeruginosa, E. coli, and S. typhimurium when used at a concentration of 20 µM in combination with photodynamic therapy (PDT). Ce6 (5 and 10 mg/kg) induces tumor regression when combined with PDT in several sarcoma rat xenograft models.