RESUMEN
About 4% to 7% of the non-small-cell lung cancer patients have anaplastic lymphoma kinase (ALK) rearrangements, and specific targeted therapies improve patients' outcomes significantly. ALK gene fusions are detected by immunohistochemistry or fluorescent in situ hybridization as gold standards in South America. Next-generation sequencing-based assays are a reliable alternative, able to perform simultaneous detection of multiple events from a single sample. We analyzed 4240 non-small-cell lung cancer samples collected in 37 hospitals from Chile, Brazil, and Peru, where ALK rearrangements were determined as part of their standard of care (SofC) using either immunohistochemistry or fluorescent in situ hybridization. A subset of 1450 samples was sequenced with the Oncomine Focus Assay (OFA), and the concordance with the SofC tests was measured. An orthogonal analysis was performed using a real-time quantitative PCR echinoderm microtubule-associated protein-like 4-ALK fusion detection kit. ALK fusion prevalence is similar for Chile (3.67%; N = 2142), Brazil (4.05%; N = 1013), and Peru (4.59%; N = 675). Although a comparison between OFA and SofC assays showed similar sensitivity, OFA had significantly higher specificity and higher positive predictive value, which opens new opportunities for a more specific determination of ALK gene rearrangements.
Asunto(s)
Quinasa de Linfoma Anaplásico/genética , Carcinoma de Pulmón de Células no Pequeñas/genética , Fusión Génica , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Neoplasias Pulmonares/genética , Proteínas de Fusión Oncogénica/genética , Adulto , Anciano , Anciano de 80 o más Años , Brasil/epidemiología , Carcinoma de Pulmón de Células no Pequeñas/epidemiología , Chile/epidemiología , Femenino , Reordenamiento Génico , Humanos , Inmunohistoquímica/métodos , Hibridación Fluorescente in Situ/métodos , Neoplasias Pulmonares/epidemiología , Masculino , Persona de Mediana Edad , Perú/epidemiología , Estudios Prospectivos , Estudios Retrospectivos , Nivel de Atención , Adulto JovenRESUMEN
HER2 upregulation is related with poor outcome in many tumor types. Whereas anti-HER2 treatment is the standard approach as adjuvant therapy in HER2-overexpressing breast cancer, the frequent relapses reinforce the need for alternative treatments. Here we used next-generation sequencing (NGS) to evaluate miRNAs and circRNAs in the cell-lines HB4a and C5.2, where the latter is a HER2-overexpressing clone of the former, and also from two different populations of their secreted extracellular vesicles. Whereas circRNA-levels were stable, we found at least 16 miRNAs apparently modulated by HER2-expression. The miR223-3p, miR-421 and miR-21-5p were validated in an independent cohort of 431 breast cancer patients from The Cancer Genome Atlas (TCGA). The consistent modulation of these molecules and their possible involvement in the HER2-axis makes them promising new targets to overcome HER2-activation.
