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229 2 Fernandes JC, Correia TM, Azevedo F, Mesquita-Guimaraes J. Tufted hair folliculitis after scalp injury. Cutis 2001; 67: 243-245. 3 Smith NP, Sandersn KV. Tufted folliculits of the scalp. J R Soc Med 1978: 606-608. 4 Pujol RM, Garcia-Patos V, Ravella-Mateu A, Casanova JM, de Moragas JM. Tufted hair folliculitis: a specific disease? Br J Dermatol 1994; 130: 259-260. 5 Powell JJ, Dawber RP, Gatter K. Folliculitis decalvans including tufted folliculitis: clinical, histological and therapeutic findings. Br J Dermatol 1999; 140: 328-333. 6 Pujol RM, Matias-Guiu X, Garcia-Patos V, de Moragas JM.Tufted-hair folliculitis.

Treatment targeting CD19 by a chimeric antigen receptor expressed on T cells (anti-CD19 CAR-T) has led to a breakthrough in the management and treatment of relapsed and refractory B- cell acute lymphoblastic leukemia (B-ALL). After infusion, the efficacy of anti-CD19 CAR-T is monitored by bone marrow negative minimal residual disease and the absence of peripheral CD19+ B lymphocytes (B-cell aplasia). In patients who have received an allogenic Hematopoietic Stem Cell Transplantation (HSCT) prior to treatment with anti-CD19 CAR-T, monitoring lineage-specific chimerism could be helpful. We found that on 4 patients who received anti-CD19 CAR-T cells after HSCT and achieved early complete response, CD19+ lineage mixed chimerism but not CD3+ lineage mixed chimerism monitored by molecular techniques anticipated earlier than B-cell aplasia determined by flow cytometry, lack of effectiveness of anti-CD19 CAR-T and leukemia relapse. Donor lymphocyte infusions (DLIs) did not prevent relapse but recovered CD3+ full donor chimerism. We suggest that continuous lineage chimerism analysis should be done routinely in patients who receive anti-CD19 CAR-T cells after HSCT and achieve complete remission because it can support early treatment intervention. However, the role of DLI in this setting is unclear, so further prospective studies should be developed.

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