Developmental and Epileptic Encephalopathy 12, also known as epileptic encephalopathy, early infantile, 12, is related to central nervous system sarcoma and botryoid rhabdomyosarcoma, and has symptoms including muscle spasticity An important gene associated with Developmental and Epileptic Encephalopathy 12 is PLCB1 (Phospholipase C Beta 1). Affiliated tissues include eye and brain, and related phenotypes are spasticity and developmental regression