Assessing the Efficacy and Safety of Selective Metabolically Adaptive Radiation Dose Escalation in Locally Advanced Non-Small Cell Lung Cancer Receiving Definitive Chemoradiotherapy

Inclusion Criteria:

* Patients who are at least 18 years old and are able to consent
* Patients who will undergo Chemo-RT as primarily modality of treatment
* Patients with a primary tumor or node measuring at least 10mm on CT scan
* Patients with a PET avid tumor having Standardized Uptake Values (SUV) \> 4
* Patients with Eastern Cooperative Oncology Group (ECOG) status 0-2 within 4 weeks of randomization

Exclusion Criteria:

* Trimodality patients who have surgery as part of curative treatment
* Previous radiotherapy to intended treatment volumes
* Active invasive malignancy other than lung cancer
* Active pregnancy
* Poor respiratory function (Forced Expiratory Volume \< 1.0 or Diffusing Capacity \< 50% age-adjusted normal)
* ECOG status \> 2
* Pre-treatment complete blood count/differential showing inadequate bone marrow reserve (absolute neutrophil count \< 1800 cells/mm3 or platelets \< 100 000 cells/mm3 or hemoglobin \< 90g/L), measured within 4 weeks of registration
* AST, ALT or total bilirubin \> 2.5 times the upper limit of normal, measured within 4 weeks of registration
* Unintentional weight loss \>10% over 3 months within 4 weeks of registration
* Severe active co-morbidity defined by:
* Significant history of uncontrolled cardiac disease; i.e. uncontrolled hypertension, unstable angina, myocardial infarction within the last 6 months, uncontrolled congestive heart failure, cardiomyopathy with decreased ejection fraction
* Transmural myocardial infection requiring intravenous antibiotics at the time of registration
* Chronic Obstructive Pulmonary Disease exacerbation or other respiratory illness requiring hospitalization or precluding study therapy within 30 days before randomization
* Acquired immune deficiency syndrome (AIDS) based on the current Centre for Disease Control definition; note, however, that HIV testing is not required for entry into this protocol