The study will include consecutive adult patients newly diagnosed with ES-SCLC (patients with the recurrent limited stage disease are also eligible).

This is an observational study; patients will not be exposed to clinical interventions different from those belonging to the standard of care.

This measure encompasses relevant demographic information of the patients included in the cohort, including median age at diagnosis, gender distribution, smoking history, and World Health Organization Performance Status (WHO PS) score. These details will provide a comprehensive understanding of the patient profile within the cohort.

This measure encompasses relevant clinical information of the patients included in the cohort, including presence of hepatic and cerebral metastases, type of platinum used in first-line (1L) treatment, and diagnostic stage (III vs. IV) of CPPC-EE. These details will provide a comprehensive understanding of the patient profile within the cohort.

This measure focuses on comparing patients with recurrent CPPC-EE and those newly diagnosed. The incidence of disease recurrence and distinct demographic and clinical characteristics between these groups, such as age, gender, smoking history, World Health Organization Performance Status (WHO PS) score, presence of hepatic and cerebral metastases, type of platinum used in first-line (1L) treatment, and diagnostic stage, will be analyzed and reported. This will allow for a deeper understanding of differences between recurrent and newly diagnosed patients.