ctDNALung-Detect is an investigator-initiated single arm, multi-institution study designed to assess the ctDNA detection rate and its association with Relapse Free Survival (RFS) in operable stage T1-T4 (T3,T4 multifocal) N0M0 non-small cell lung cancer (NSCLC) patients.

Inclusion Criteria:

1. Age ≥ 18 years;
2. Ability to provide written informed consent;
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1;
4. T1-T4 (T3,T4 multifocal) N0M0 NSCLC who are planned for complete surgical resection;
5. Tumour size must be at least 1 cm (unidimensional) and have at least some solid component on imaging;
6. Surgical tumour formalin-fixed, paraffin-embedded (FFPE) specimens for ctDNA studies are required.

Exclusion Criteria:

1. Prior radiation, surgery or chemotherapy for the current diagnosis of NSCLC is not permitted.
2. Incomplete surgical resection. Participants who had pre-operative ctDNA samples taken but subsequently do not have a complete surgical resection would not qualify for post-operative ctDNA testing.
3. Concurrent enrolment in a therapeutic study using drug or radiation therapy. Enrolment in observational, diagnostic or studies of novel surgical techniques will be allowed.
4. Concurrent active malignancy or other invasive malignancy within previous 2 years. Non-invasive malignancies (i.e., cervical carcinoma in situ, in situ prostate cancer, non-melanomatous carcinoma of the skin, ductal carcinoma in situ of the breast that has been surgically cured) are excluded from this definition.
5. Pregnancy.

Early stage (T1-T4 (T3,T4 multifocal) N0M0) non-small cell lung cancer, with planned complete surgical resection.