CXCL12 and carcinoma: Our previous work [16] identified six carcinoma subtypes of prognostic value and we show here that CXCL12 expression is decreased in all subtypes, although to a lesser extent in the subtypes C4 and C6 (p = 4.4e-03 for C4 and p = 1.1e-11 for C6 vs. normal tissue - Figure 1A).