PRLR and Burkitt lymphoma: Because expression of individual PRLR isoforms in these samples was unavailable, we compared overall survival after separating patients into PRLRhigh and PRLRlow groups based on their median mRNA expression of total PRLR. Total PRLR levels did not correlate with survival of DLBCL/BL patients (Supplementary Fig. 9), suggesting either that local production of autocrine PRL was more important than levels of PRLR expression and/or that some tumors still express some level of SFPRLRs.