I don’t know if this is any help but I was born with a rare defective heart. I also have MCUS with a precancerous condition, which is progressing into a Non Hodgkin’s Lymphoma. After 3 heart attacks triggered by the defect, I received a stent in my left Atrial Chamber. My problem is this after talking to my Oncologist Hematologist, I could be severely impacted on what treatments could be administered to me once the cancer fully develops. She was honest with me and said any treatment she might give me could kill me. What she did say was that any procedure done on the heart is very hard on it. My only opinion is do nothing and let the cancer kill me or use the safest treatment she can use and hope it doesn’t kill me. I guess my strong will to live will make the final decision. I hope all goes well and he survived the procedure. Good luck, @becky1024