Fan, K. F., Hopper, C., Speight, P. M., Buonaccorsi, G., MacRobert, A. J., & Bown, S. G. (1996). Photodynamic therapy using 5-aminolevulinic acid for premalignant and malignant lesions of the oral cavity. Cancer, 78(7), 1374–1383. doi: 10.1002/(SICI)1097-0142(19961001)78:7<1374::AID-CNCR2>3.0.CO;2-L. Here, AICDA is linked to cancer.