Here’s a non secretory study.
https://pubmed.ncbi.nlm.nih.gov/25382589/

It’s a little old from 2015. It seems to conclude it has more favorable longevity vs standard MM.

Looking for current studies should provide info based on the latest treatments.

I cannot remember his name but a man posted in the last day that he is nonsecretory. Annecares husband is also nonsecretory. I have a friend who is nonsecretory and she was diagnosed about 11 years ago

I don't have non secretory, but my immunoglobulins are all very low. They aren't giving me IgG because I haven't had major infections since my transplant. I too try to stay safe. I had all my baby shots over. Covid shots and boosters. I also got Evusheld in April. I get it again this month. I'm thinking of having titers drawn to see if the baby shots have given me any immunity. Trying to do all I can to stay healthy. Emory does bone marrow biopsies on all myeloma patients yearly. I get mine in November. Thank goodness they knock me out. How often will you get a biopsy?

Probably at 6 months post st em cell transplant.