In microarray data sets GSE6135 (Ji et al., 2007), GSE21581 (Carretero et al., 2010), and GSE54353 (Xu et al., 2014) deposited in the Gene Expression Omnibus (GEO; http://www.ncbi.nlm.nih.gov/geo/) from genetically engineered mouse models of lung cancer, Cxcl13 was increased in KrasG12DStk11-/- mice (especially in metastatic tumors), as compared with KrasG12DStk11wt mice (Figure 1J). Here, CXCL13 is linked to metastatic neoplasm.