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In animal models and humans, mutations in voltage-dependent calcium channel gamma-2 subunit gene (CACNG2) have been associated with neuronal hyperexcitability, including neuropathic pain. The objective of this study was to determine the allelic and genotypic frequencies of CACNG2 polymorphisms (rs4820242, rs2284015 and rs2284017) and their association with the risk of chronic peripheral neuropathic pain (CPNP) in the Mexican population.