On the other hand, the proportion of Th2 cells (CCR6−CXCR3−CD4+ T cells) among conventional CD4+ T cells in BALF, but not in peripheral blood, was significantly higher in PF-ILDs than in non-PF-ILDs (42.0% vs 9.0%, p = 0.001, Table 3, Fig. 2E). This evidence concerns the gene CD4 and pemphigus foliaceus.