Kaposi sarcoma is a multicentric angioproliferative neoplasm of lymphatic endothelium-derived cells. Although this malignancy is relatively frequent after solid-organ transplant, it is extremely rare after bone marrow transplantation. Allogeneic stem cell transplantation is associated with severe prolonged immunosuppression; however, a few cases of Kaposi sarcoma after hematopoietic stem cell transplant were previously reported. Here, we report a case of Kaposi sarcoma after haploidentical allogeneic hematopoietic stem cell transplant. The patient was a known case of acute myelogenous leukemia and underwent transplant after relapse. Four months posttransplant, she presented with 3 dark blue or purplish small nodules on her face above the upper lip. Histopathologic study confirmed Kaposi sarcoma. Serum antibody against human herpes virus type 8 was positive. After discontinuation of immunosuppressive medication and cryotherapy for local control, Kaposi sarcoma skin nodules healed with residual pigmented skin lesions. The patient is currently in complete remission for Kaposi sarcoma and cured from acute myelogenous leukemia 36 months after stem cell transplant. Only 14 cases of Kaposi sarcoma after hematopoietic cell transplant have been previously reported in the literature (11 after allogeneic and 3 after autologous hematopoietic stem cell transplant). According to our knowledge from literature review, this case is the first report of Kaposi sarcoma after a haploidentical HLA match transplant.
Key words: Acute myelogenous leukemia, HLA haploidentical match
IntroductionHematopoietic stem cell transplant (HSCT) is an established treatment for many acquired and congenital disorders of the hematopoietic system. Kaposi sarcoma was first described in 1872 by Kaposi as a progressive sarcoma. 1 It is a multicentric angioproliferative neoplasm of lymphatic endotheliumderived cells. Kaposi sarcoma is classified into 4 types based on the clinical condition in which it develops: (1) sporadic or classic subtype, (2) endemic, (3) AIDS associated or epidemic Kaposi sarcoma, and (4) iatrogenic subtype in patients treated with immunosuppressive therapy medications, particularly in organ transplant recipients (typically seen with renal allografts).Kaposi sarcoma, which is shown relatively frequently after solid-organ transplant, is extremely rare after bone marrow transplant. Allogeneic stem cell transplant is associated with severe prolonged immunosuppression; however, a few cases of Kaposi sarcoma after HSCT were previously reported. [2][3][4][5][6][7][8][9][10] The cause of Kaposi sarcoma is complex but is almost certainly dependent on a gamma herpes virus, human herpes virus type 8 (HHV-8), as causal agent. 11,12 After allogeneic stem cell transplant, Kaposi sarcoma can develop when a patient is positive for HHV-8.Here, we report a case of Kaposi sarcoma after haploidentical allogeneic HSCT. The patient was a known case of acute myelogenous leukemia (AML) and underwent transplant after relapse. According to our knowle...