['In benign prostatic hyperplasia, increased prostate smooth muscle tone and prostate volume may contribute alone or together to urethral obstruction and voiding symptoms. Consequently, it is assumed there is a connection between smooth muscle tone and growth in the prostate, but any molecular basis for this is poorly understood. Here, we examined effects of Src family kinase (SFK) inhibitors on prostate contraction and growth of stromal cells.', 'SFK inhibitors, AZM475271 and PP2, were applied to human prostate tissues to assess effects on smooth muscle contraction, and to cultured stromal (WPMY-1) and c-Src-deficient cells to examine effects on proliferation, actin organization and viability.', 'SFKs were detected by real time PCR, western blot and immunofluorescence in human prostate tissues, some being located to smooth muscle cells. AZM475271 (10\xa0μM) and PP2 (10\xa0μM) inhibited SFK in prostate tissues and WPMY-1 cells. Both inhibitors reduced α'] Are smooth muscle contraction and growth of stromal cells in the human prostate both inhibited by the Src family kinase inhibitors , AZM475271 and PP2?