Any Simpson-Golabi-Behmel syndrome in which the cause of the disease is a mutation in the GPC3 gene. The disease is Monarch Disease Ontology id MONDO_0020602 (Simpson-Golabi-Behmel syndrome type 1). Also known as: DGSX Golabi-Rosen syndrome, GPC3 Simpson-Golabi-Behmel syndrome, SGBS1, Simpson dysmorphia syndrome, Simpson-Golabi-Behmel syndrome caused by mutation in GPC3, Simpson-Golabi-Behmel syndrome, type 1, X-linked recessive, bulldog syndrome.