The vast majority of glucocorticoid activity in most mammals is from cortisol, also known as hydrocortisone. Corticosterone, the major glucocorticoid in rodents, is another glucocorticoid.
Men who test negative for a known breast cancer gene abnormality have the same very low risk of developing breast cancer as men in the general population. Whether you are a woman or a man, testing negative also means that you could not have passed the genetic abnormality on to your children.
A positive test result confirms NF1. If the test is positive, your child has NF1. This means a mutation was found in your child's NF1 gene. A positive test result cannot tell you how severe the disease will be.