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Is 90% reduction in Kappa FLC a sign of remission in Multiple Myeloma
Since my Kappa Free Light Chain has gone from 21,893.83 to 491.98, my Kappa/Lambda ratio has gone from 3,959.10 to 58.57 and my M-Spike has gone from .25 to .10 in the four months I have been on my Multiple Myeloma Infusion therapy, does this mean I am going into remission? Are these extraordinary drops in my blood work a sign that these drops can possibly continue at this reduction rate and can my MM eventually go into complete remission? My MM only presents as bone lesions that appeared after a bone trauma injury in the site of the injury that did not heal, without Calcium, Renal failure or Anemia present. Does the fact the my MM is only bone lesion present increase the odds that my MM can result in full remission? I understand that there is no cure for MM, but can full remission continue long term?
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This is the response from the Claude app based on your first sentence:
Those numbers are moving in a very good direction — this is the kind of trend oncologists like to see. Let me put it in context.
What's happening:
Kappa free light chain: down ~98% (21,893.83 → 491.98)
Kappa/Lambda ratio: down ~98.5% (3,959.10 → 58.57), though still elevated above the normal range (roughly 0.26–1.65)
M-spike: down 60% (0.25 → 0.10 g/dL)
This pattern — sharp, consistent drops across all three markers — is consistent with a strong response to treatment.
But "remission" is a specific clinical term. Myeloma response is staged using the International Myeloma Working Group (IMWG) criteria, with categories like:
Partial response (PR): ≥50% reduction in M-protein
Very good partial response (VGPR): ≥90% reduction in M-protein, or M-spike below detection with a positive immunofixation
Complete response (CR): negative immunofixation, no M-spike, <5% plasma cells in a bone marrow biopsy
Stringent CR / remission: CR plus normal free light chain ratio and no abnormal plasma cell clones (often confirmed by biopsy or flow cytometry)
Based on the M-spike drop alone, your numbers land you in VGPR territory. But your K/L ratio, while dramatically improved, is still above normal — so a formal "remission" or CR designation would need that ratio (and likely a bone marrow biopsy) to normalize too.
Bottom line: this is genuinely excellent progress and a strong sign the infusion therapy is working. Whether it meets the formal definition of remission is something your hematologist/oncologist will determine, usually with a bone marrow biopsy alongside these labs. Worth asking them directly at your next visit what response category they'd classify this as — they'll have the full picture including your baseline staging and any imaging.
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Hug
2 Reactions@captdon , the numbers do indicate your therapy is working. Great that you have seen such a large decrease in 40 mo. Make sure you get a complete writeup from your care team on your progress, including all your bloodwork results and additional tests needed (timing for BMB, PET scan, others). What treatment are you receiving, and what brand of MM and genetic markers do you have? I have had high risk IgA Kappa free light chain smouldering MM with the 1q21 gain mutation for 2 years (Kappa 1,300, K/L 95, M spike 1.4). I'm lucky in that I'm the about 4% of people that are diagnosed before symptoms/damage ramps up. I signed up for a bispecific antibody clinical trial, to see if SMM can be stopped/remission before it becomes MM.
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Hug
5 Reactions@captdon, you're asking great questions. Have you been able to discuss the results with your hematologist? What did you find out?