Hello there, first time posting but have used this forum several times in the past and found it very helpful. Looking for other patient’s experiences of reducing Chimerism after transplant. My 15 year old son had his transplant in January for refractory T cell ALL. Initially (day 33) his peripheral blood chimerism was 100% donor, this has dropped to 90% at day 118, T cells 100% donor. His only bone marrow was at 69 days and was 94% donor (97% T cells). I’m really worried that this leaves him vulnerable to relapse. The medical team plan to do a CD34 lymphocyte ‘boost’ from his donor. Just wondering if anyone has had a similar experience and what the outcome was. I like to be prepared for the worst so appreciate good and poor outcome experiences.