Collagen Disease, also known as collagen disorder, is related to mixed connective tissue disease and systemic scleroderma. An important gene associated with Collagen Disease is COL1A1 (Collagen Type I Alpha 1 Chain), and among its related pathways/superpathways are ERK Signaling and Integrin Pathway. The drugs Hydrocortisone and Hydrocortisone acetate have been mentioned in the context of this disorder. Affiliated tissues include bone and skin, and related phenotypes are homeostasis/metabolism and growth/size/body region