Received: 29 June 2016
Accepted: 12 February 2018
First Online: 17 February 2018
Ethics approval and consent to participate
: The study was approved by Escola Nacional de Saúde Pública, Oswaldo Cruz Foundation’s Research Ethics Committee (reference number 31042514.3.0000), on June 4, 2014; and by José Alencar Gomes da Silva National Cancer Institute’s Research Ethics Committee (reference number 524031042514.3.3001.5274), on June 30, 2014.Regarding consent to participate, the study is in compliance with the Brazilian Research Ethics Resolution 466/12 (CEP/CONEP). According to the resolution, the researcher responsible for the CEP/CONEP system must formally request consent exemption. Therefore, we submitted the official letter of request on the grounds of the study being based on primary and secondary data from a retrospective cohort of patients diagnosed with advanced/metastatic lung cancer (stage IIIB / IV), who had began their treatment between January and December 2011, with the impossibility of contact with the patient. The data were analyzed anonymously and the results presented in aggregate form, not allowing the identification of individuals. Moreover, the use of this retrospective information would not interfere with the subsequent therapeutic or diagnostic measures, in the event of the continuation of treatment. Our request was approved according to Ethics Committee reference numbers 524.031.042.514.3.3001.5274 (INCA) and 31.042.514.3.0000 (ENSP).
: Not applicable.
: The authors declare that they have no competing interests.
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