GPR55 and cholangiocarcinoma: A similar result was obtained when analysis was performed on the subgroup of CC patients expressing high levels of CXCL17 mRNA (CXCL17 mRNA values higher than 0.0014 mRNA copies/18S rRNA unit; 75th percentile; [14]), again dividing the lymph node values into a GPR55(+) and a GPR55(−) group using the same division as above (Figure 3C).