Influence of radiotherapy on 6-sulphatoxymelatonin levels in the urine of brain cancer patients. Vijayalaxmi , Selva M, Reiter R, Meltz M, Prihoda T, Barnes J, Leal B, Dahiya R, Herman T. Journal Article 2000; 21(3): 203-207 PubMed PMID: 11455350 Citation : OBJECTIVES: The synthesis of melatonin, an endogenous compound synthesized by the pineal gland in the brain, is reported to be depressed..... Read abstract Full text PDF