The primary delay in diagnosing mesothelioma isn't lab work, but repeated, non-diagnostic pleural fluid taps. Educating pulmonologists and thoracic surgeons to proceed to a pleural biopsy faster when suspicion is high can significantly shorten the time to diagnosis and treatment.
Contrary to its role in lung cancer, PD-L1 expression does not predict benefit from immunotherapy in mesothelioma. Data from major trials shows similar outcomes regardless of PD-L1 status, leading clinicians to omit this test entirely and streamline treatment decisions.
Frontline treatment selection hinges on histology. Non-epithelioid mesothelioma responds poorly to chemotherapy, making dual immunotherapy (Nivo/Ipi) the clear choice. For epithelioid cases, chemo-immunotherapy is a strong option, especially for symptomatic patients, due to its higher and faster response rate.
Data from the Checkmate 743 trial shows that patients who stopped dual immunotherapy (Nivo/Ipi) due to toxicity can still achieve long-term benefits. A third of these patients had an ongoing response at three years, despite stopping treatment after only four months on average, providing confidence in the regimen.
For patients with very high-burden or symptomatic mesothelioma, clinicians may deviate from standard guidelines. They may choose chemo-immunotherapy to maximize the chance of a rapid response, viewing it as their single best opportunity to control the disease, especially if the patient's condition is precarious.
Immediate therapy is not always required for mesothelioma. For older patients with incidentally discovered, asymptomatic, and slow-growing disease, active observation is a reasonable clinical strategy. This approach avoids treatment-related toxicity while keeping a close watch on disease progression.