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Protohypericin is a naphthodianthrone that has been found in H. perforatum and has anticancer activity.1,2,3 It induces photocytotoxicity in HeLa cervical cancer cells in the presence of light with a 50% cytotoxic concentration (CC50) value of 0.21 µM.2 In vivo, protohypericin labeled with 131iodine (131I-protohypericin), in combination with combrestatin A4 3'-O-phosphate (Item No. 10007415), increases survival, decreases tumor volume, and induces tumor necrosis in an A549 lung cancer mouse xenograft model.3
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1. Determination of naphthodianthrones in plant extracts from Hypericum perforatum L. by liquid chromatography-
2. Photocytotoxicity of protohypericin after photoconversion to hypericin. Planta Med. 65(8), 719-722 (1999).
3. Tumor necrosis targeted radiotherapy of non-