Holoprosencephaly 1, also known as arhinencephaly, is related to holoprosencephaly 8 and holoprosencephaly 6. An important gene associated with Holoprosencephaly 1 is FGF8 (Fibroblast Growth Factor 8), and among its related pathways/superpathways are Gastrulation and Mesodermal commitment pathway. The drugs Doxorubicin and Cisplatin have been mentioned in the context of this disorder. Affiliated tissues include brain and eye, and related phenotypes are intellectual disability and seizure