A 65-year-old man is seen in follow-up for a recent diagnosis of non–small cell lung cancer. He presented 2 weeks ago with a 3-month history of worsening shortness of breath, fatigue, and reduced appetite with a 35-pound weight loss. Medical history is notable for COPD with baseline shortness of breath with exertion, but no supplemental oxygen requirement. Medications are tiotropium and as-needed albuterol metered dose inhalers.
Physical examination at the time of diagnosis revealed decreased breath sounds in the left lung field. Chest radiograph showed near complete obliteration of the left lung field. CT scan of the chest confirmed the presence of a large left-sided pleural effusion and showed evidence of multiple hepatic and osseous metastatic lesions. He underwent left-sided large volume thoracentesis, and cytology confirmed squamous cell carcinoma.
He currently notes that despite fluid drainage, his breathing has not improved significantly and he is now using home oxygen. He remains weak, spending significant time in bed and requiring assistance in performing many of his daily self-care activities.
Chest auscultation reveals a clear improvement in left-sided breath sounds, and a chest radiograph shows a small amount of residual pleural fluid on the left.
Which of the following is the most appropriate management?