Recent research highlights a role for CD44 in fibrotic processes (37–40): the role of CD44 in mesenchymal progenitor cells and their differentiation into fibroblasts in IPF, as well as its involvement in the acquisition of a motile phenotype by IPF fibroblasts (in patients fulfilling diagnostic criteria for IPF) and their invasive capabilities, has already been discussed in previous studies. Here, CD44 is linked to idiopathic pulmonary fibrosis.