SSTR1 and neoplasm: Further analysis using multiple linear regression confirmed that both ARSI exposure status (exposed vs. naive) and AR mutation status (mutated vs. WT) independently predicted SSTR1 expression (β = –1.62, P = 5.88 × 10–5 and β = 2.53, P = 3.84 × 10–5, respectively), with a trend toward significant statistical interaction (P = 0.067), whereas tumor purity had no effect (P = 0.82).