This is a Myth! More current research has explored multiple etiologies of Cushing’s. It was once thought that heredity had no influence on the development of Cushing’s Syndrome/Disease and our knowledge was once limited in this sense.
Read more at https://cushieblogger.com/2018/04/18/myths-and-facts-about-cushings-men1-and-men2-are-the-only-genetic-causes-of-cushings/