BECN1 and cancer: MDA-MB231 was chosen to ectopically express the BECN1 isoforms because analysis with COSMIC database (Catalogue Of Somatic Mutations In Cancer; https://cancer.sanger.ac.uk/cosmic, accessed on 24 June 2021) shows that this cell line is genetically categorized for its nonmutant status of the autophagy proteins investigated in our study.