Their cognitive and behavioral effects seem to be mediated by several factors including growth factors, neurotransmitters, and neurotrophins such as the increased level of brain-derived neurotrophic factor (BDNF) in the hippocampus [1, 3, 4]; BDNF induction could also promote diverse biological changes in the metabolism, immunity, and suppression of cancer growth [2]. The gene discussed is BDNF; the disease is cancer.