LRP6 and gastric cancer: Interestingly, an immunoprecipitation assay with a PD4 antibody against the p37 protein detected a complex containing p37 and two upstream regulators of β‐catenin signaling, including GSK3β and the Wnt receptor LRP6,16, 17, 18 in M hyorhinis‐infected gastric cancer cells (Figure 4A).