Routine laboratory test results revealed a white blood cell count of 7400/μL (to convert white blood cell count to ×109/L, multiply by 0.001) (with 81% neutrophils, 18% lymphocytes, and 1% monocytes), a red blood cell count of 3.92 × 106/μL (to convert red blood cell count to × 1012/L, multiply by 1.0), a platelet count of 271 × 103 /μL (to convert platelet count to × 109/L, multiply by 1.0), and a hemoglobin level of 10.8 g/dL (to convert hemoglobin level to grams per liter, multiply by 10.0). Blood chemistry test results showed an elevated serum level of C-reactive protein at 3.4 mg/dL (to convert C-reactive protein level to nanomoles per liter, multiply by 9.524), and a decreased albumin level at 3.37 g/dL (to convert albumin level to grams per liter, multiply by 10). No abnormal findings were observed in the serum lactate dehydrogenase or immunoglobulin levels, anti–human immunodeficiency virus antibody, or CD4/CD8 ratio of peripheral blood lymphocytes. Thymidine uptake by lectin-stimulated lymphocytes was slightly decreased. The following serum cytokine levels were slightly elevated: G-CSF (27 pg/mL [reference range, 4.7-18.1 pg/mL]), interleukin 6 (11.1 pg/mL [reference range, <4 pg/mL]), and interleukin 8 (20.9 pg/mL [reference range, <20 pg/mL]). Computed tomography revealed the presence of mild lung fibrosis, reflecting the increased levels of sialylated carbohydrate antigen KL-6 at 668 U/mL (309 ). No abnormality was found by gastrointestinal or colonic fiberoptic examination. Gallium 67 citrate scintigraphy demonstrated mild accumulation of the isotopes in the elbow joints.