John Kwong Siew Shia

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CYP2D6 plays a major role in the metabolism of tamoxifen, and polymorphism of P-glycoprotein has been associated with resistance of many drug therapies. This study investigates the clinical impact of genetic variants of CYP2D6 and ABCB1 in breast cancer patients treated with tamoxifen. Blood samples from 95 breast cancer patients treated with tamoxifen were(More)
BACKGROUND Dihydropyrimidine dehydrogenase (DPD) is a pyrimidine catabolic enzyme involved in the initial and rate-limiting step of the catabolic pathway of toxic metabolites of 5-fluorouracil (5-FU). Several studies have reported that deficiency of DPD and polymorphisms of its gene are related to 5-FU toxicities and death. Association between serum(More)
A series of new 1,3,4-oxadiazole derivatives were synthesized and evaluated for their antioxidant, cytotoxic, and apoptosis activities. Antioxidant activity was determined in vitro using free radical scavenging (2,2-diphenyl-1-picrylhydrazyl) and ferric reducing antioxidant power assays. Most of the synthesized compounds exhibited significant antioxidant(More)
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