CNR1 and triple-negative breast carcinoma: CB2R is clearly involved in hepatocellular carcinoma (Xu et al., 2015), myeloma (Barbado et al., 2017), and renal carcinoma (Khan et al., 2018), whereas both CB1R and CB2R contribute to the antiproliferative activity in triple-negative breast cancer (Qamri et al., 2009).