RT Journal Article T1 Identification of ALK-positive patients with advanced NSCLC and real-world clinical experience with crizotinib in Spain (IDEALK study). A1 Aguado de la Rosa, Carlos A1 Cruz Castellanos, Patricia A1 Lázaro-Quintela, Martín A1 Dómine, Manuel A1 Vázquez Estévez, Sergio A1 López-Vivanco, Guillermo A1 Fírvida Pérez, José Luis A1 Alonso Romero, José Luis A1 Ferrera Delgado, Lioba A1 García Girón, Carlos A1 Diz Taín, Pilar A1 Álvarez Álvarez, Rosa A1 Mut Sanchís, Pilar A1 Fernández Cantón, Inmaculada A1 Manrique Abós, Isabel A1 Martínez Aguillo, Maite A1 Gómez-Aldaraví Gutiérrez, Lorenzo A1 Ortega Granados, Ana Laura A1 Álvarez Cabellos, Ruth A1 García Sebastián, Arancha A1 García Sifuentes, Luis Fernando A1 Reguart, Noemí K1 ALK-positive non-small cell lung cancer (NSCLC) K1 Anaplastic lymphoma kinase K1 Crizotinib K1 Incidence K1 Real-world K1 Tyrosine kinase inhibitors AB To determine the incidence of ALK translocations in patients with advanced/metastatic NSCLC in Spain, to describe the clinical characteristics of these patients, and to evaluate the effectiveness and safety of treatment with crizotinib in a real-world setting. This is an observational prospective and retrospective cohort study to determine the incidence of ALK translocations and to analyze the effectiveness and safety of crizotinib in a real-world setting. Patient characteristics, treatment patterns, time to best overall response, duration of treatment, objective response rates (ORR), rates of adverse events (AE), progression free survival (PFS) and overall survival (OS) were evaluated in the ALK study cohort of patients treated with crizotinib (prospective and retrospective). ALK incidence and quality of life (QoL) questionnaires were measured from patients included in the prospective cohort. The incidence of ALK translocations was 5.5 % (31 of 559 patients). Compared with ALK-negative patients, ALK-positive patients were significantly younger, predominantly female, and non-smokers. In the crizotinib effectiveness and safety study, 91 patients (42 prospective, 49 retrospective) with ALK-positive NSCLC (43.9 % in first-line, 56.1 % in second or more lines) were included. The ORR was 59.3 % and the median duration of response was 13.5 months (IQR, 5.3-26.2). The median PFS was 15.8 months (95 % CI, 11.8-22.3) and the median OS was 46.5 months, with 53 patients (58.2 %) still alive at data cut-off date. Frequently reported AEs included elevated transaminases, gastrointestinal disorders, and asthenia. Most patients (76.5 %) reported improved or stable scores for global QoL during treatment. The observed incidence of ALK translocations in NSCLC patients is aligned with published reports. This analysis of the real-world clinical experience in Spain confirms the therapeutic benefit and safety of crizotinib in advanced/metastatic ALK-positive NSCLC. gov: NCT02679170. YR 2022 FD 2022-09-19 LK http://hdl.handle.net/10668/22355 UL http://hdl.handle.net/10668/22355 LA en DS RISalud RD May 10, 2025