AR and bulbospinal muscular atrophy: Spinal bulbar muscular atrophy (SBMA), also known as Kennedy's disease, is an X-linked recessive motor neuron disorder associated with >38 CAG repeats in the androgen receptor (AR) gene [1], that affects approximately 1/40,000 men (although prevalence is greater in certain locations, such as the Vaasa region of Finland) [2].