The serum KL-6 levels in untreated idiopathic pulmonary fibrosis can naturally decline in association with disease progression.
Hiroshi IshiiHisako KushimaYoshiaki KinoshitaMasaki FujitaKentaro WatanabePublished in: The clinical respiratory journal (2018)
A reduction in the serum KL-6 levels of patients with untreated IPF may not mean that the disease activity has subsided. Serum KL-6 levels can naturally decline in association with disease progression.