IntroductionGraft-versus-host disease (GVHD) is a potentially serious complication of allogenic stem cell transplantation (allo-SCT), but patients who develop GVHD also have a low incidence rate of leukemia recurrence, suggesting a graft-versus-leukemia effect due to the donor lymphocytes.1 This effect has also been suggested in solid tumors. In the case here, cervical cytology transformed from squamous cell carcinoma to negative for intraepithelial lesion or malignancy (NILM), possibly due to a graft-versus-tumor (GVT) effect following allo-SCT. The cervical cytology has continued changing, although the dose of immunosuppressant likely also has an effect. Here we describe our experience in this case and review the literature.