In order to validate the presence of this peculiar transcript in breast cancer cells with different features and aggressiveness, the expression of CPT1A variant 1 and variant 2 were evaluated, by RT-PCR, also in cell lines representing other breast cancer phenotypes, MDA-MB-231 and SK-BR-3, the former derived from a basal phenotype and the latter luminal B PR/Her2+ expressing breast cancer cells. This evidence concerns the gene ERBB2 and breast cancer.