Provided herein are methods of treatment of an individual having amyotrophic lateral sclerosis, comprising administering to the individual a therapeutically effective amount of placental stem cells, e.g., tissue culture surface-adherent placental stem cells (PDACs). In one aspect, provided herein is a method of treating amyotrophic lateral sclerosis (ALS) comprising administering to an individual having ALS a therapeutically effective amount of placental stem cells. In certain embodiments, “therapeutically effective” means an amount effective to reduce or ameliorate one or more symptoms of ALS.