PTGDR2 and airway hyperresponsiveness: The number of DP2+ inflammatory cells and DP2+ epithelial cells had reciprocal correlations with total sputum cell counts (r = 0.54, P = .003; r = −0.42, P = .028), FEV1 percentage bronchodilator response (r = 0.36, P = .048; r = −0.43, P = .002), and airway hyperresponsiveness (r = −0.586, P = .004; r = 0.55, P = .009), respectively, but not with FEV1 percent predicted, FEV1/forced vital capacity ratio, or sputum differential cell counts.