I was diagnosed with 6% MGUS last year May after bone marrow biopsy. Doctor Hematologist/Oncologist said watch it may never change. 6 months blood work and annual biopsy. At 6 months my blood work showed dramatic jump in lambda light chain. He decided another biopsy and came back MM. In treatment now and numbers in bloodwork changed for good. He said rarely do they find it early. 2 more months then biopsy to see.