ORAI1 and prostate carcinoma: Conversely, an opposite effect has been reported in prostate cancer cells since the downregulation of Orai1 expression, caused by steroid-deprived conditions or by using specific siRNA against Orai1, and the impairment of Orai1 function by the overexpression of two Orai1 mutants, Orai1 R91W and Orai1 L273S, prevented the apoptotic cell death induced by different pharmacological compounds, including thapsigargin, TNFα, cisplatin, and oxaliplatin.