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Background and objectiveSerum markers, including Krebs von den Lungen (KL‐6), surfactant protein (SP)‐D, SP‐A and carcinoembryonic antigen (CEA), are reported to reflect autoimmune pulmonary alveolar proteinosis (APAP) disease severity. We evaluated serum CYFRA21‐1 levels as a marker of APAP.
MethodsIn addition to KL‐6, SP‐D and CEA, we prospectively measured serum CYFRA 21‐1 levels in 48 patients...
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