RGS2 and polyostotic fibrous dysplasia: PFD and hUC-MSCs were combined to act on myofibroblasts (MFBs) to observe the effect of their combination on the expression of RGS2, which has antifibrotic effects, to preliminarily explore the possible mechanism of the combined treatment and provide a theoretical basis for the treatment of IPF with hUC-MSCs combined with PFD.