title: Serum KL-6 for the evaluation of active pneumonitis in pulmonary sarcoidosis.
abstract: KL-6, a mucinous high-molecular weight glycoprotein, expressed on type II pneumonocytes, is elevated in the serum of patients with active interstitial pneumonia. Forty-seven patients with histologically confirmed sarcoidosis were analyzed by chest radiography, CT, 67Ga scintigraphy, BAL fluid (BALF), and serum KL-6. Serum KL-6 level was significantly elevated in radiographic type II (945 +/- 725 U/mL; n = 13; p < 0.01) and type III (1,179 +/- 1,320 U/mL; n = 9; p < 0.01), as compared with type 0 (333 +/- 173 U/mL; n = 10) and type I (430 +/- 225 U/mL; n = 15). Serum KL-6 level was significantly elevated in patients with CT findings of irregular small opacities, ground-glass opacities, and thickened bronchovascular bundle (p < 0.01), as compared to those without these findings. Serum KL-6 level was significantly elevated in patients with positive pulmonary accumulation in 67Ga scintigraphy (1,108 +/- 1,044; n = 20; p < 0.001) as compared to those without accumulation (390 +/- 206; n = 27). Serum KL-6 level was elevated in patients with a higher CD4+/CD8+ ratio (> or =3) in BALF, as compared to those with lower ratios. These results suggest that serum KL-6 is a useful marker of sarcoidosis activity.
authors.affiliation: Department of Pulmonary Medicine, Jichi Medical School, Tochigi, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Kobayashi
authors.forename: S
authors.initials: S
authors.lastname: Kitamura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000941:Antigens / Q000097:blood*; D000951:Antigens, Neoplasm; D015415:Biomarkers / Q000097:blood; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006023:Glycoproteins / Q000097:blood*; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D018396:Mucin-1; D009077:Mucins; D011014:Pneumonia / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D017565:Sarcoidosis, Pulmonary / Q000150:complications* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed
chemical_list: D000941:Antigens; D000951:Antigens, Neoplasm; D015415:Biomarkers; D006023:Glycoproteins; C060192:MUC1 protein, human; D018396:Mucin-1; D009077:Mucins