Idiopathic Pulmonary Fibrosis — GAP Index Stratification

A 68-year-old male non-smoker presents with 9 months of progressive exertional dyspnea and dry cough. HRCT shows basal, subpleural honeycombing with traction bronchiectasis in a usual interstitial pneumonia (UIP) pattern. Spirometry reveals FVC 62% predicted and FEV₁/FVC 0.85; DLCO is 38% predicted. IPF is diagnosed and the GAP Index is calculated: Gender (Male = 1) + Age 68 years (1 point) + FVC 62% (1 point) + DLCO 38% (1 point) = 4 points total. The patient is stratified into the category marked **B** in the diagram. Which of the following best describes the prognostic significance and recommended management approach for a patient in this GAP stage?