We assessed LRP5 or LRP6 mRNA levels in the different tumor subtypes: TNBC (n=41), HER2+/ER- (n=30), luminal A (n=29) and luminal B (n=30). Total RNA was extracted from frozen tumor samples with the RNeasy Mini Kit (Qiagen, Courtaboeuf, France) and was then processed with an RNA clean-up kit (Qiagen). The quality of the RNA was checked, and samples were then hybridized with U133 Plus 2.0 Affymetrix chips and processed in accordance with the manufacturer's instructions. The data were analyzed as described elsewhere [46 (link), 47 (link)].
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