Adoption and new cancer diagnosis

I unfortunately just found out that I have breast cancer. We are in the process of adopting our daughter and I am wondering if anyone knows if I need to disclose this to our AW. I just got my medical clearance a few weeks ago, but am unsure if I am required to give them an update if my health has changed. Has anyone experienced this before? If I don't tell them could it cause them to stop the adoption if they were to find out?