Chunk #14 — Results — ABCB1

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Combined analysis of circulating β-endorphin with gene polymorphisms in OPRM1, CACNAD2 and ABCB1 reveals correlation with pain, opioid sensitivity and opioid-related side effects.

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Among patients with the minor TT allele, there was a trend for sex differences in β-endorphin levels. Men tended to have higher levels than women (p = 0.057; Figure 2).