148 Review Article Selective androgen receptor modulators: the future of androgen therapy? Andrew R. Christiansen1, Larry I. Lipshultz2,3, James M. Hotaling4, Alexander W. Pastuszak4 1University of Utah School of Medicine, Salt Lake City, UT, USA; 2Scott Department of Urology; 3Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX, USA; 4Division of Urology, Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, USA Contributions: (I) Conception and design: AR Christiansen; (II) Administrative support: AW Pastuszak; (III) Provision of study material or patients: AR Christiansen; (IV) Collection and assembly of data: AR Christiansen; (V) Data analysis and interpretation: AR Christiansen; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors. Correspondence to: Alexander W. Pastuszak, MD, PhD. Assistant Professor, Division of Urology, Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, USA. Email:
[email protected]. Abstract: Selective androgen receptor modulators (SARMs) are small molecule drugs that function as either androgen receptor (AR) agonists or antagonists. Variability in AR regulatory proteins in target tissues permits SARMs to selectively elicit anabolic benefits while eschewing the pitfalls of traditional androgen therapy. SARMs have few side effects and excellent oral and transdermal bioavailability and may, therefore, represent viable alternatives to current androgen therapies. SARMs have been studied as possible therapies for many conditions, including osteoporosis, Alzheimer’s disease, breast cancer, stress urinary incontinence (SUI), prostate cancer (PCa), benign prostatic hyperplasia (BPH), male contraception, hypogonadism, Duchenne muscular dystrophy (DMD), and sarcopenia/muscle wasting/cancer cachexia. While there are no indications for SARMs currently approved by the Food and Drug Administration (FDA), many potential applications are still being explored, and results are promising.