CD1A and Langerhans cell histiocytosis: For LCH lesions, Mann-Whitney tests were conducted to compare the median percentage of CD1a+ TH cells (n = 5, 60.1±26.6) with CD1a− TH cells (n = 5, 50.2±17.9), and the percentage of CD1a+ TC cells (n = 5, 12.9±11.4) with CD1a− TC cells (n = 5, 19.5±10.6).