Keloid Keloid Keloid, also known as keloid disorder and keloidal scar, is the formation of a type of scar which, depending on its maturity, is composed mainly of either type III (early) or type I (late) collagen. It is a result of an overgrowth of granulation tissue (collagen type 3) at the site of a healed skin injury which is then slowly replaced by collagen type 1. Keloids are firm, rubbery lesions or shiny, fibrous nodules, and can vary from pink to the color of the person's skin or red to dark brown in color. A keloid scar is benign and
PIK3CA-related overgrowth spectrum PIK3CA-related overgrowth spectrum PIK3CA-related overgrowth spectrum (PROS) is an umbrella term for rare syndromes characterized by malformations and tissue overgrowth caused by somatic mutations in PIK3CA gene. In PROS diseases individuals malformations are seen in several different tissues such as skin, vasculature, bones, fat and brain tissue depending on the specific disease. PROS spectrum diseases include: PIK3CA gene codes for p110α protein which is a catalytic subunit of phosphoinositide 3-kinase, a major regulator of several important cellular functions such as cell proliferation, growth and apoptosis.. Mutations in PIK3CA cause over-activity of PI3K which in turn leads to altered growth of