The goal of this study is to find the maximum tolerable dose of radiation that can be delivered combined with chemotherapy (carboplatin & paclitaxel) in patients with stage III non-small cell lung cancer (NSCLC).

Concurrent chemoradiotherapy is the standard of care for unresectable stage III NSCLC based on the results of phase III randomised trials. The current standard radiation therapy dose has remained 60- Gy at -2 Gy/fraction for nearly four decades (60Gy), with local disease control rates of approximately 50% and a median overall survival of only 18 months.These results are suboptimal and more effective treatment regimens are needed.

We hypothesize that hyperfractionated radiation dose escalation to residual tumor volumes after standard chemoradiotherapy as defined by positron emission tomography (PET) /computed tomography (CT) would improve local control and overall survival while reducing the acute and late normal tissue toxicity.

Inclusion Criteria:

1. Patients must have FDG-avid and histologically or cytologically proven non-small cell lung cancer.
2. Age 1 8-75.
3. Zubrod performance status 0-2.
4. Stage III ( American Joint Committee on Cancer AJCC, 7th ed.).
5. No prior radiation to the thorax that would overlap with the current treatment field.
6. Adequate bone marrow, renal and hepatic functions as assessed by the following: Hemoglobin >/= 10.0 g/dl, Platelet count >/= 1 00,000/mm^3,absolute granulocyte count (AGC) ≥2 × 10^9 cells/L,bilirubin and Aspartate transaminase ≤1.5 ×upper limit of normal (ULN), Creatinine \