MGUS is considered asymptomatic and is not a cancerous condition, which is why the "US" stands for unknown significance. That said, there is a 1%/year chance of it progressing to multiple myeloma or other cancer. I'm 70 and have had MGUS for 8 years; I have IgA Kappa light chain MGUS and my Kappa is ~300 and Kappa/Lambda is 29. It is good with MGUS, and life in general, to follow a healthy diet, get enough exercise and sleep, and manage stresses. MGUS doesn't limit me; I can still volunteer, exercise, and have fun. It is hard getting a diagnosis of MGUS, and good that you are doing background research.