Inversion 3 Cytogenetic Abnormality in an Allogeneic Hematopoietic Cell Transplant Recipient Representative of a Donor-Derived Constitutional Abnormality

- Transmission of hematologic disorders is a rare complication of allogeneic HCT.
- We report transmission of a constitutional inv (3) balanced chromosome inversion.
- We discuss the uncertain significance of aberrant chromosomal abnormalities in donors.

Allogeneic hematopoietic cell transplantation (HCT) is an important treatment for many severe hematologic disorders; however, HCT can be associated with significant complications, including organ toxicity, graft-versus-host disease, and relapse. Another serious, but rare, complication is the transmission of hematologic and nonhematologic diseases from the donor to the recipient. With older donors, the risk of an abnormality may be increased. Here we describe the transmission of an inversion 3 constitutional cytogenetic abnormality from an unrelated donor to a recipient, and review the clinical implications of the discovery of donor-derived constitutional cytogenetic abnormalities.