Q. A 52-year-old female with no history of smoking presents to the clinic with a persistent cough and shortness of breath for the past 2 months. She reports unintentional weight loss and occasional chest pain. Her vital signs are as follows: temperature 37°C (98.6°F), heart rate 85 beats/min, respiratory rate 18 breaths/min, blood pressure 125/80 mm Hg, and oxygen saturation 95% on room air. A chest CT scan reveals a peripheral lung mass. A biopsy of the mass is performed, and the pathology report indicates the presence of columnar cells surrounding a fibroblastic core. What is the most likely diagnosis for this patient?