Using Biomarkers for Diagnosis, Risk Stratification of Post -Treatment Recurrence and Long-Term Surveillance of Lung Cancer

A lung tissue biomarker to risk stratify patients immediately after curative lung cancer resections into groups with low risk versus intermediate-high risk for recurrence of cancer. Intermediate-high risk patients will be advised to undergo adjuvant chemotherapy with the expectation of decreasing their chance of recurrence. The effectiveness and toxicity of the adjuvant chemotherapy itself is considered not part of the study-just the decision to recommend adjuvant chemotherapy is the study intervention. Investigators will then evaluate the long-term survival results of low-risk patients (no adjuvant treatment) and intermediate-high risk patients receiving adjuvant treatment versus intermediate-high risk patients who decline adjuvant therapy.