What Is in the Literature.

This issue of What Is in the Literature focuses on articles over the past year on clinical aspects of motor neuron disease, including amyotrophic lateral sclerosis (ALS) and primary lateral sclerosis (PLS). Disease-modifying treatment for ALS remains a challenge as 2 formal drug trials did not hold up to retesting. There are new thoughts based on a multistep model to partially explain why ALS develops relatively late in life. New information on fluid biomarkers, sex differences, efficacy of medical marijuana for common symptoms, and cognitive dysfunction are discussed. For the clinic, there are updated guidelines for multidisciplinary management. Other articles address how frequently the topic of sexual health is brought up in the clinic, and insights into how patients view end-of-life issues and quality of life when using tracheal ventilation. PLS has diagnostic challenges and practical aspects, which are reviewed.