Abstract

Severe keratinocyte dysplasia (SKD) has been reported in the early post‐transplant period of hematopoietic stem cell transplant (HCST) patients, with a frequency as high as 47.4%. In the period less than 3 weeks post‐transplant it was associated with cyclophosphamide conditioning. The purpose of our study was to determine the prevalence of SKD in a later post‐transplant period, from 28 days to 84 days, and study the possible causes. The 2003 slide file (227 slides) of Seattle Cancer Care Alliance was examined for skin biopsies from patients who had undergone HCST. Twenty‐two cases (9.7%) showed SKD. A control group of 22 biopsies matched for days post‐transplant and age were selected from the remaining 205 biopsies. SKD was associated with a busulfan conditioning regimen, 72.7% in the SKD group and 36.3% in the control group (p = 0.016). SKD was not associated with cyclophosphamide (p = 0.174), fludarabin (p = 0.263) or total body irradiation (p = 0.50). Although active GVHD (grade 2 or 3) was more commonly seen in SKD group (45.5%) than the control group (22.2%), it did not show significant difference (p = 0.052). Our study showed that SKD developed in 9.7% of the skin biopsies from days 28 to 84 post‐transplant, and was associated with busulfan conditioning regimen.

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