Lung cancer is the second most common cancer in both sexes worldwide. Small-cell lung cancer (SCLC) is a form of neuroendocrine tumor, which is classified into limited and extensive-stage disease and shows excellent initial response to chemotherapy; however, almost all patients relapse later. During the past few years, several clinical trials have evaluated the effect of addition of immunotherapy to conventional chemotherapy in patients with extensive SCLC. Checkpoint inhibitors are currently under investigation, especially the CTLA-4 and PD-1/PD-L1 inhibitors. Nowadays, evidence show a statistically significant survival benefit of adding atezolizumab, an IgG1 monoclonal antibody targeting against PD-L1, to platinum-based chemotherapy plus etoposide in patients who have not received any previous systemic therapy. Furthermore, the role of nivolumab, an IgG4 anti-PD-1 monoclonal antibody, is significant for the treatment of relapsed SCLC cases. Recently, pembrolizumab was the first immunotherapeutic agent to be approved by the FDA for patients with metastatic SCLC with disease progression on or after platinum-based chemotherapy and at least one other prior line of chemotherapy. Nevertheless, prognostic biomarkers to immunotherapy response remain to be discovered.

Pulmonary hypertension (PH) is a progressive, multifactorial syndrome characterized by elevated pulmonary arterial pressure and right heart dysfunction, associated with significant morbidity, impaired quality of life, and poor prognosis. Advances in classification, hemodynamic definitions, and targeted pharmacotherapies have improved understanding and management, yet therapeutic challenges persist across the five World Health Organization groups of PH. Historically, exercise was discouraged due to concerns about adverse hemodynamic effects, but growing evidence has suggested that structured, supervised training is safe and beneficial. Randomized trials and meta-analyses show improvements in six-minute walk distance, peak oxygen uptake, right ventricular function, ventilatory efficiency, and health-related quality of life, with a low incidence of adverse events. Physiological adaptations include favorable cardiac remodeling, enhanced endothelial function, improved skeletal and respiratory muscle performance, and improved neurohormonal activity. Despite this evidence, barriers such as patient fears, limited clinical expertise, and restricted access to specialized rehabilitation programs hinder widespread implementation. Current guidelines recommend supervised exercise as part of pulmonary rehabilitation for patients with stable PH, supporting its role as an adjunct to pharmacotherapy. This descriptive review briefly summarizes the pathophysiology of PH, phenotype-related differences and current therapeutic approaches, and the beneficial adaptations to exercise training, with the aim of informing exercise specialists and supporting safer, more effective integration of exercise-based rehabilitation into patient care.