A 65-year-old man with H/O 30 pack years of smoking presents with weight loss, cough with expectoration and hemoptysis for 40 days. Serum Na was found to be 124 mEq/L. Serum Ca -10 mg/dl. Chest X ray showed a hilar mass. Brush cytology and sputum was positive for tumor cells. What of the following subtypes of lung carcinoma does this this patient most likely have?
Squamous cell carcinoma Adenocarcinoma Small cell carcinoma Large cell carcinoma