ABCG2 and non-small cell lung carcinoma: Interestingly, α2δ1 is functionally sufficient and indispensable to promote TIC properties by mediating Ca2+ influx into cells, which subsequently activate Calcineurin/NFATc2 signaling that directly activates the expression of NOTCH3, ABCG2. Importantly, a specific antibody against α2δ1 has remarkably therapeutic effects on NSCLC xenografts by eradicating TICs.