FOXP1 and cancer: Haploinsufficiency of forkhead box protein P1 (FOXP1) causes a rare neurodevelopmental disorder that is characterized by a vast array of symptoms that include developmental delay, motor coordination deficits, specific language impairment, autistic features, intellectual disabilities, dysmorphic features, various cancers, and congenital defects of the heart, kidneys and urinary tract1,2 (MIM 605515 (gene); MIM 613670 (disorder)).