Morphine and other opioids are used to manage cancer-related pain; however, the role of these drugs in cancer progression remains controversial. Emerging evidence indicates that morphine can activate Toll-like receptor 4 (TLR4) and its signaling pathways, by the way the activation and expression of TLR4 can promote melanoma. In this study, we investigated the effects of morphine on the expression of TLR4 and promotion of melanoma in mice.
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