Kevin Ng, a researcher studying the promotion of immunotherapy of lung cancer by antibodies against endogenous retroviruses, joins Immune and discusses his work. They explore the role of endogenous retroviruses in the immune system and the development of a mouse model for studying lung cancer. They also delve into the functionality of B cells in tumor protection, the role of PD1 and PDL1 in regulating the immune response, and using gene sequencing and baseline data to predict cancer response.