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In our BMT Unit, we have observed a high frequency of skin rash associated with fever and other clinical findings during engraftment of autologous BM and/or PBSC. Thirty patients with breast cancer and 12 patients with Hodgkin’s or non-Hodgkin’s lymphoma, treated with the same regimen, were analyzed retrospectively or prospectively to characterize the clinical syndrome, its frequency, and its clinical course, as well as to define the factors affecting its incidence. In patients developing skin rash, the median and range for time to onset of skin rash and for time to increase in WBC after reinfusion of stem cells were identical (8 days, range 5–13) and did not differ significantly (P = 0.533). Twenty-three patients (55%) had skin rash, 18 patients had fever. Other, less frequent manifestations include platelet transfusion refractoriness (PTR), diarrhea, diffuse alveolar hemorrhage, and autoimmune thrombocytopenia or hemolytic anemia. A higher proportion of breast cancer patients developed the syndrome in comparison to lymphoma patients (67% vs 25%, P = 0.051). Acute GVHD grade I–II was established histologically in six patients with the syndrome. Comparison of the incidence of the syndrome by different variables using Fisher’s exact test revealed significance for disease category (P = 0.02) and number of previous treatment regimens (P = 0.002) as predictive factors for developing the autoaggression syndrome. In other words, patients with breast cancer and those with only one previous treatment regimen were more likely to develop the syndrome. This study suggests that an autoaggression GVHD-like syndrome accompanies the early phase of autologous engraftment and that a higher frequency of the syndrome might be seen in breast cancer patients undergoing high-dose chemotherapy and autologous stem cell transplantation. [ABSTRACT FROM AUTHOR]