Surgery is the standard care for patients with stage I lung cancer. Despite successful surgery, 20-30% of patients will relapse. Chemotherapy can improve patient survival; however, it is controversial if early stage cancer patients should be treated with chemotherapy since, for many cases, it will harm quality of life with little therapeutic benefit.
Utilizing patient samples, the investigators conducted a retrospective study in eight patient cohorts that validated the gene classifier set. These prognostic methods can guide physicians to select appropriate treatment and follow-up while sparing other patients of unnecessary treatment and negative side-effects of chemotherapy.