Exclusion criteria encompassed studies related to sensory neuropathy, multiple sclerosis, diabetic neuropathy, fibromyalgia, post-surgical pain, cancer pain, and other non-cancer pain causes, as well as studies involving cannabinoid mimetic interventions such as palmitoylethanolamide and fatty acid amide hydrolase (FAAH) inhibitors. This evidence concerns the gene FAAH and sensory peripheral neuropathy.