Background Recent impressive advances in cancer immunotherapy have been largely derived from cellular immunity. The role of humoral immunity in carcinogenesis has been less understood. Based on our previous observations we hypothesize that an immunoglobulin subtype IgG4 plays an essential role in cancer immune evasion. https://www.roneverhart.com/Cocktail-Shaker-and-V-Rod-Bar-Set-Mermaid-Color-Options/