To examine the interplay of circHIAT1 and miR-19a-3p on CADM2 expression, BC cells were transfected with empty vector, circHIAT1 expression vector, circHIAT1 expression vector+miR-NC, or circHIAT1 expression vector+miR-19a-3p mimic. This evidence concerns the gene CADM2 and breast cancer.