SULT1A1 and cancer: The results showed that all four cell lines expressing SULT1A1 were sensitive to NSC-743380, with IC50 values between 0.03 and 0.3 μM, whereas the two SULT1A1-negative cell lines were resistant, with IC50 >3 μM (Fig. 4B), demonstrating that SULT1A1 expression can be used to identify sensitive cancer cells in vitro.