R18 (PHCVPRDLSWLDLEANMCLP) is a peptide studied and utilized in biomedical research, particularly for cancer treatment, due to its potential to inhibit cancer cell growth and effectively stimulate the immune system to combat abnormal cells. Additionally, research indicates that this peptide can serve as a drug delivery vehicle to enhance treatment efficacy, especially by precisely targeting and delivering drugs to specific cells. Preliminary studies also highlight its potential in treating other conditions, such as infectious diseases and neurological disorders. However, its applications remain in the experimental and research phases to ensure safety and efficacy prior to human use.