Histologically or cytologically documented non-small cell carcinoma of the lung diagnosed within 16 weeks prior to study enrollment.

Patient must be at least 18 years old at the time of consent.

Stage III A or III B disease.

Patients must be able to start study treatment within 6 weeks of study enrollment.

Induction chemotherapy is allowed.

Marginally resectable or unresectable at presentation.

If the patient had exploratory thoracotomy, it must be done at least 3 weeks prior to enrollment.

Proton Therapy With Chemotherapy for Stage III Non-Small Cell Lung Cancer (LU02)