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cml with grade 1 fibrosis
Fibrosis of the marrow is often checked for at the start of treatment via a trephine done at the same time as a bone marrow biopsy. I guess you had that? It's not fun.
Grade 1 is obviously better than later grades. Basically it means your bone marrow is a little scarred and lost a little "sponginess". It might mean it's a little less effective than a "normal" person. There is some evidence that imatinib (and perhaps other TKIs) reverse BM fibrosis.
Has your doctor said anything more?