Table 4

Mean (SE) concentration of iron in alveolar macrophages (AM) in relation to occupation and lung diseases

μg/106AMnmol/106AMPerls (score 0–300)4-a
Controls0.3 (0.0)7 5.9 (0.5)7 5.5 (1.6)15
0.3 (0.2)6 7.5 (0.6)17
12.8 (1.3)30
Asymptomatic smokers0.6 (0.0)7 10.9 (2.2)7 21.7 (5.6)15
0.5 (0.4)6
Symptomatic smokers1.4 (0.2)7 24.7 (4.3)7 25.8 (9.8)15
2.1 (0.9)6 27.6 (17.9)17
43.0 (7.7)30
Blast furnace workers1.8 (1.5)6
Coke oven workers1.1 (0.9)6
Welders1.7 (0.6)6
Smoker patients with lung carcinoma2.3 (2.7)6
Non-smoker patients with lung carcinoma1.6 (3.0)6
Goodpasture syndrome6.2 (1.5)6
  • Superscript numbers are reference numbers.

  • 4-a Perls staining evaluates haemosiderin content. Score was made on 100 AM (0 = absence of staining; 1 = weak (less than 25% cytoplasm stained); 2 = moderate (25–50% cytoplasm stained); 3 = intense (more than 50% stained).