The role of LMW HA in the pathogenesis of inflammatory interstitial lung diseases leading to pulmonary fibrosis is still emerging; however, given that LFA-1 has been associated with the HA receptors CD44 and TLR2, we hypothesized that inhibition of LFA-1 could be exploited to treat inflammatory interstitial lung diseases leading to pulmonary fibrosis. This evidence concerns the gene CD44 and interstitial lung disease.