Hi, Thanks for writing in. Your boyfriend has been completely treated for bone cancer. Bone cancer is of many types, some are aggressive and some are responsive to treatment. If he has got the right treatment and his cancer has been treated 25 years back then it is possible that he will not get any recurrence. Regarding marriage, it is the unity of two people and their emotions. If you choose, you can request him to get a sperm count analysis done and know his fertility status. This is because he might have taken chemotherapy that might have affected his fertility. This is not a serious concern and I have seen many cancer patients who have had children after getting treated for cancer during childhood. There are many tablets with imprint NVR in the market and having different medications. It will help to identify the medication based on the imprint on both side of the tablet.