A study of tunica albuginea plaque fibroblasts from 36 people (mean age, 56 years) with stable Peyronie's disease (mean, 2.3 years) confirmed the importance of the MMP and TGF‐β pathways in the fibrotic process of Peyronie's disease via use of protein microarrays and Western immunoblotting.37 The gene discussed is TGFB1; the disease is Penile Fibromatosis.