Summary:We describe an allogeneic bone marrow (BM) recipient who developed aggressive, metastasizing squamous cell cancer (SCC) of the skin, and discuss possible risk factors in the development of this secondary solid tumor. The patient had been treated with cyclosporine (CsA), methyl-prednisolone and thalidomide for 3 years because of extensive de novo chronic cutaneous GVHD occurring 1 year after BMT. Ten years after BMT a locally invasive and metastasizing SCC occurred on the patient's neck, and diagnosis was confirmed by H&E histopathology and cytokeratin-immunohistochemistry. Analysis of genomic DNA did not reveal p53 mutations nor were HPV sequences detectable. Risk factors included conditioning for BMT with total body irradiation (TBI) and cyclophosphamide (Cy), immunosuppressive treatment for GVHD, and extensive exposure to UV radiation before and after BMT. Despite surgery and adjuvant chemotherapy with 5-fluorouracil (5-FU) the patient died 1 year after the diagnosis of SCC. Keywords: secondary malignancy; squamous cell carcinoma; GVHD; immunosuppression With numbers of BM transplants from related and unrelated donors increasing recently the frequency of secondary neoplasms which impair long-term outcome and survival of the BM recipients has also been increasing. The risk of developing secondary cancer after allogeneic BMT has been reported to be increased 6.69-to 11-fold over that of an age-matched population. 1,2 Whereas lymphoproliferative cancers, myelodysplastic syndrome, acute leukemia and non-Hodgkin's lymphoma predominate in the first years after BMT, solid cancers including neoplasms of the central nervous system, bone, inner organs, skin and mucosal sur- faces occur progressively 10-15 years thereafter. 1-3 The largest cohort study on nearly 20 000 allogeneic BM recipients showed the cumulative incidence for secondary solid tumors to be 6.7%.
Case reportSCC was diagnosed in a previously healthy 26-year-old Caucasian male patient in January 1985 who subsequently received 8 units of packed red blood cells and 4 units of platelets. Five months later, after conditioning with 200 mg Cy/kg body weight (b.w.) over 4 days and TBI of 3 Gy, he received 2.7 ϫ 10 8 nucleated cells (NC)/kg b.w. from his HLA class I and II identical brother. Methotrexate (MTX) according to the Seattle protocol was used as GVHD prophylaxis. Neutrophil counts of more than 0.5 ϫ 10 9 /l and 1 ϫ 10 9 /l were reached on days ϩ35 and ϩ53, respectively, after BMT. Unsupported platelets Ͼ20 ϫ 10 9 /l, hematocrit Ͼ30% and reticulocytes Ͼ20 000/ml without the need for further transfusion were reached on days ϩ24 and ϩ12, respectively. Donor cell engraftment was documented by the presence of donor ABO blood group. Because of poor marrow function MTX was stopped on day ϩ39. The patient showed no signs of acute GVHD and was discharged on day ϩ49 post BMT.One year after BMT, he developed de novo onset chronic cutaneous GVHD with lichenoid lesions on the lips and oral mucosa. We initiated systemic immunosuppression with 1.5 mg prednisolo...