Cutaneous busulfan effect in patients receiving bone-marrow transplantation

Area of Science:

• Oncology
• Hematology
• Dermatopathology

Background:

• Bone-marrow transplantation (BMT) is a crucial treatment for hematological malignancies.
• Preparatory regimens for BMT can induce significant systemic side effects.
• Cutaneous manifestations of chemotherapy require careful histological evaluation.

Purpose of the Study:

• To investigate the cutaneous effects of high-dose busulfan and cyclophosphamide conditioning regimens in BMT recipients.
• To compare these effects with those induced by cyclophosphamide and total-body irradiation.
• To determine the relationship between these histological changes and graft-versus-host disease.

Main Methods:

• Histopathological examination of skin biopsies from BMT patients.
• Analysis of patients receiving different pre-BMT conditioning regimens (busulfan/cyclophosphamide vs. cyclophosphamide/total-body irradiation).
• Correlation of histological findings with clinical data, including graft-versus-host reaction.

Main Results:

• Abnormal epidermal keratinocyte nuclei (enlarged) were observed in 12 of 13 patients treated with busulfan and cyclophosphamide.
• Similar nuclear abnormalities were previously noted in lung, cervix, and bladder tissues with long-term busulfan exposure.
• No significant keratinocyte nuclear abnormalities were found in patients receiving cyclophosphamide and total-body irradiation.
• The observed histologic effect was transient and independent of graft-versus-host reaction.

Conclusions:

• High-dose busulfan, in combination with cyclophosphamide, induces a transient, specific histological change in epidermal keratinocytes.
• This cutaneous busulfan effect is distinct from the effects of cyclophosphamide/total-body irradiation and graft-versus-host disease.
• Recognition of this transient histological finding is important for accurate dermatopathological interpretation in BMT patients.