[Age-related changes of 6-sulphatoxymelatonin excretion in stomach and colorectal cancer patients].

Circadian rhythm of 6-sulphatoxymelatonin (aMT6s) excretion has been studied in stomach cancer (n = 89) and colorectal cancer (n = 86) patients. The excretion of aMT6s was decreased in cancer patients. The disturbances of the circadian rhythm of aMT6s excretion have been observed in the cancer patients as well.