PTPRR and idiopathic pulmonary fibrosis: Interestingly, while not significant in our analysis, several SNPs identified (Figure 1) reside within genes which exhibit biologic plausibility for an association with sarcoidosis severity and susceptibility including PTPRR, a MAPK phosphorylation regulator, down-regulated gene in lung fibrosis and IPF [52] and whose expression we have shown to be prominently dysregulated in PBMCs from sarcoidosis subjects [53].