Hi Char Cook It’s not unusual for myeloma to affect the kidneys. Renal damage is one of the key symptoms, along with bone damage, high calcium and/or anaemia.
Your dad’s kidney issues are more severe than mine were (are) but I’ve seen a number of myeloma patients say that they needed dialysis until their myeloma was got under control. Some of those have been alive for over a decade since they were diagnosed. Your dad’s age and previous good health will really help him. Im not medically qualified but I suspect that he will need a different myeloma treatment, that the one he has been on has stopped working. This is not what any of us want to hear, but it isn’t unusual. There are a number of different drugs, some of which work in different ways, and hopefully one, or a combination of these, will get his light chains down again, and his kidneys will start working reasonably again. Its a very stressful situation for you all to be in, but his team will have encountered this problem before.