PTGDR2 and asthma: The number of DP2+CD3+ cells was significantly increased in biopsy specimens from patients with mild, moderate, and severe asthma compared with that seen in specimens from healthy control subjects (mean [SEM]: 25 [5] vs 14 [2] mm2 submucosa, P = .011; 33 [3] vs 14 [2] mm2 submucosa, P < .001; and 47 [4] vs 14 [2] mm2 submucosa, respectively; P < .001) and in biopsy specimens from patients with severe asthma compared with those from patients with mild and moderate asthma (mean [SEM]: 47 [4] vs 25 [5] mm2 submucosa, P < .001; 47 [4] vs 33 [3] mm2 submucosa, P = .030).