Background: Allogeneic hematopoietic stem cell transplantation (HSCT) is a curative treatment option in both adult and pediatric patients with malignant and non-malignant hematological diseases. Chimerism analysis, which determines the donor or recipient origin of hematopoietic cells in HSCT recipients, is an essential aspect of post-HSCT follow-up. Objectives: To review the current literature and develop Belgian consensus guidelines for the use of chimerism analysis in the standard of care after allogeneic HSCT. Methods: Non-systematic review of the literature in consultancy with the members of the BHS transplantation committee. Results: Clinical application with regards to prediction of graft failure or relapse as well as cell source are reviewed. A consensus guideline on the use of chimerism analysis after HSCT is presented. Conclusion: Monitoring of the dynamics or kinetics of a patient's chimerism status by serial analysis at fixed time points, as well as on suspicion of relapse or graft failure, is needed to monitor engraftment levels, as well as disease control and possible relapse.

The natural history of primary eosinophilia remains highly variable and is characterized by underlying disease heterogeneity. Chronic eosinophilic leukemia, not otherwise specified (CEL-NOS) is a rare and aggressive disease characterized by non-specific cytogenetic abnormalities or elevated blasts, with high risk of transformation to acute leukemia. We describe a case of CEL-NOS with two hierarchically related non-specific cytogenetic rearrangements, associated with an NPM1 mutation and followed by evolution to secondary AML. NPM1 mutations are not previously described in CEL-NOS.

We present a case of cutaneous mucormycosis in a patient with several important risk factors precipitating disease, namely underlying acute myeloid leukaemia and poorly controlled secondary diabetes. Inoculation was most likely caused by repeated minor trauma (insulin injection) at the site of infection. Treatment consisted of surgical debridement and liposomal Amphotericin B (LAmB) during 71 days. Posaconazole had already been initiated prior to infection as primary antifungal prophylaxis but was discontinued during follow-up as susceptibility testing later revealed resistance to posaconazole. Additional treatment with caspofungin and G-CSF was associated because of poor initial result to treatment. Caspofungin was later continued as monotherapy when LAmB had to be interrupted because of renal toxicity. Treatment was completed after closure of the surgical site. The patient was successfully treated and remains infection free for one year after initial diagnosis.

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