To clarify - Donor CD34+ cells went from 86% to 0%.

Clarification: Donor CD34+ Chimerism at 0% — This Changes the Picture

Thank you for that critical clarification. This is a notably different finding than I initially interpreted, and it warrants prompt attention from your transplant team.

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What This Actually Means

If donor CD34+ went from 86% to 0%, this indicates:

• Loss of donor-derived stem cells in your bone marrow
• Return of recipient (your own) CD34+ cells to detectable/dominant levels
• Potential graft failure or graft loss in the stem cell compartment

This is materially different from successful engraftment and represents a concerning pattern that needs immediate evaluation.

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Why This Matters for Your tMDS

You're 15 months post-allo-HSCT (transplant on 2/27/25). At this timepoint:

According to NCCN MDS Guidelines, persistent or recurrent recipient chimerism in the CD34+ compartment can indicate:

1. Secondary graft failure — loss of donor engraftment after initial success
2. Disease relapse risk — your own MDS cells re-establishing themselves
3. Need for intervention — your transplant team may consider:
   • Donor lymphocyte infusion (DLI)
   • Second transplant
   • Other salvage strategies

Even though your TP53 is mutation-negative (favorable prognostic marker) and you have IPSS-M moderate-low risk disease, loss of donor chimerism in CD34+ is not a pattern to monitor passively.

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Critical Context: Your Recent Health Events

Your medical profile notes you've had:

• Recent myocardial infarction (MI) — a serious cardiac event
• Mouth sores at 15 months post-transplant — could indicate chronic GVHD, infection, or other post-transplant complications
• Common variable immunodeficiency (CVID) diagnosis — this affects your immune reconstitution post-transplant

These factors together suggest your post-transplant course has been complicated, and the CD34+ chimerism loss may be part of a broader pattern your team needs to address.

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Questions to Ask Your Transplant Team URGENTLY

1. "My CD34+ donor chimerism dropped from 86% to 0%. What does this indicate about my graft status?"

2. "Do my myeloid and T-cell chimerism results show similar loss of donor cells, or is this isolated to the CD34+ compartment?" (This distinction matters — isolated CD34+ loss is different from complete graft failure)

3. "Given my recent MI and mouth sores, are these related to the chimerism change, or separate complications?"

4. "What are my options if this represents graft failure? Am I a candidate for DLI, a second transplant, or other interventions?"

5. "How does my CVID diagnosis affect my immune reconstitution and my ability to maintain a graft?" (CVID can complicate post-transplant immune recovery)

6. "What is my relapse risk given this chimerism pattern, and what monitoring should we do?"

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Why Timing Matters

At 15 months post-transplant:

• Early graft failure (weeks 1-3) is different from secondary graft failure (what this may represent)
• Your immune system should be reconstituting, but CVID complicates this
• Intervention options exist, but timing is important

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Bottom Line

This is not a "wait and see" result. The loss of donor CD34+ chimerism from 86% to 0% represents a significant change that requires:

1. Immediate discussion with your transplant team — don't wait for other lineage results
2. Complete chimerism panel interpretation — to understand if this is isolated to CD34+ or broader
3. Assessment of your overall post-transplant status — given your MI, mouth sores, and CVID diagnosis
4. Discussion of next steps — whether that's close monitoring, DLI, or other interventions

Your transplant team has your complete clinical picture and can contextualize this finding properly. This warrants a phone call or urgent appointment, not just waiting for the next scheduled visit.

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This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.