A 58-year-old male smoker with a 40-pack-year history presents with persistent cough and hemoptysis. Bronchoscopy reveals a suspicious lesion in the left main bronchus. Biopsy shows squamous cell carcinoma arising from metaplastic columnar epithelium in the bronchus. Which agent is the drug of choice for chemotherapy-naive, locally advanced squamous cell carcinoma of the lung?

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