Objective To report immune-reconstruction in two patients with acute radiation sickness due to 60Co radiation accident after stem cell transplantation.Methods Patient “A” and “B” were diagnosed as intestinal form of acute radiation sickness(ARS)and extremely severe degree bone marrow form of ARS,respectively.Peripheral blood stem cell transplantation was successfully performed in these two patients.During their whole disease course,absolute lymphcyte count,neutrophil leukocyte count,T-lymphocyte subsets,natural killer(NK),and immunoglobulin were sequentially determined.Results Immunoglobulin was decreased after irradiation without any recovery tendency after the transplantation.After irradiation,absolute lymphcyte count decreased rapidly,but recovered partially after the transplantation(maintained at 0.5?109/L).Neutrophilic leukocyte count rose rapidly to normal after the transplantation.NK was lowered obviously after irradiation,and it rapidly recovered to normal level after the transplantation,and maintained at a level higher than normal.After irradiation,the proportion of CD4/CD8 showed a transient rise,followed by an abrupt lowering.After the transplantation,it showed a tendency of elevation,but it did not recover to normal.Conclusions The tendency of lowering of immunoglobulin,lymphocyte count,NK cell count,and CD4/CD8 ratio indicate that there is a rapid deterioration of both cellular and humoral immunity after irradiation.Following the homogeneic peripheral blood transplantation,neutrophil count and NK cell count showed a rapid recovery,lymphocyte count and CD4/CD8 ratio also showed a tendency of slow elevation,but there is no sign of recovery of immunoglobulin.The results indicate that there is a faster recovery of cellular immunity.

Objective To explore the clinical significance of allogeneic peripheral stem cell transplantation in the treatment of acute radiation sickness.Methods Two victims were accidentally irradiated by a 60Co source in a nuclear accident in Jining,Shandong province,China in 2004.They were exposed to more than 20-25 Gy(patient A)and 9-15Gy(patient B)of 60Co-ray,and were diagnosed as having developed intestinal form of acute radiation sickness(ARS)and extremely severe bone marrow form of ARS,respectively.After the treatment with the preparative regimens based on low-doses of fludarabine,antilymphocyte globulin and cyclophosphamide,the two patients successfully received HLA-haploidentical(patient A)and HLA-identical(patient B)peripheral blood stem cell transplantation(PBSCT),respectively,7 days after the exposure.Cyclosporin A combined with mycophenolate mofetil was used for the prevention of graft-versus-host disease(GVHD).In addition,bone marrow mesenchymal stem cells from a donor were administered into patient A by intra-bone marrow injection.Results Both peripheral blood and bone marrow examinations showed the recovery of hemopoiesis after PBSCT,and neither patients displayed obvious clinical signs of GVHD.However,patient A died of septicemia and multi-organ failure on day 33 after the exposure,while patient B died of heart failure dominant multi-organ failure on day 75 after the exposure.Conclusions Allogeneic PBSCT is a feasible and effective treatment for ARS,while infection and multi-organ failure are major causes of death of the patients.

Objective To investigate the significance of HLA haploidentical peripheral blood stem cell transplantation for the treatment of intestinal form of acute radiation sickness. Methods Patient “A” from Shandong province suffered from a 60 Co radiation accident with a dose of 20-25Gy, and was diagnosed as intestinal form of acute radiation sickness. On the 3rd day after irradiation, total environmental protection (TEP), antibiotics treatment and emergency HLA zygosity with his elder sister were done, and HLA haploidentical peripheral blood stem cell transplantation was performed with a preconditioning regimen of “CTX+ATG+Flu”. The regimen for protecting from GVHD was “CsA/FK506+MMF+CD25+MSC”. Results WBC began to increase on the 17th day after treatment, and WBC recovered to 5.1?109/L on the 19th day, platelet to over 30?109/L, and RCT to normal. Bone marrow image showed hematopoietic recovery of the three cell lineages. Continuously detection of the implantation ratio of donor's cells by STR-PCR, sexual chromosome analysis and HLA zygosity showed stable complete donor-derived chimera. No GVHD was observed. On the 19th days after treatment, chest X-ray films and CT suggested that a mixed bacterial and fungous infection existed in the patient's lungs. The severest skin damage occurred on the 25th day which occupied 14% of whole body surface. The functions of lung, kidney and heart were damaged sequentially. The patient died of multiple organ failure (MOF) 33 days after admission. Conclusion It is the first time to report a successful HLA haploidentical peripheral blood stem cell transplantation for the treatment of intestinal form of acute radiation sickness in China. A successful transplantation might be a key for prolonging the survival period of such a patient.

Objective To report the diagnosis and treatment of an extremely severe bone marrow form of acute radiation sickness complicated with disseminated Trichosporon Asahii in Jining,Shandong province, China.Methods An extremely severe bone marrow form of acute radiation sickness was transfered to our hospital 3 days after the accident on October 24,2004.The patient was performed allogeneic stem cell transplantion from his brother and soon acquired hematogenesis recovery, however, refractory disseminated Trichosporonosis(mainly lung) then occured in the patient.after the hemato-reconstitusion,and gradually aggravate.Result Strong support treatment and high dosage combination of drug therapy were used to combat fungi ,the accumulative dose of Ampghotec (amphotericin B) was 2965mg, the accumulative dose of itraconazole was 4000mg, and the accumulative dose of Caspofungin(concidas) was 3020mg. The refractory disseminated Trichosporon Asahii was once partially controlled, but the radiation injury and infection were still becoming worse even after many kinds of antiinfection drugs, the patient then died of multiple organ failure on d75 after the accident. Conclution The combination of Ampghotec with Caspofungin and Itraconazole in the treatment of disseminated Trichosporon Asahii was effective, no related toxicity occured, which has not been reported before. However, with continuously injury of radiation, we couldn’t cure the Trichosporonosis thoroughly, and the patient finally died of multiple organs failure related with radiation and infection.According to the clinical treatment of the patient, we also acquired the experience that when we resolve the hematogenesis, to promote the immunologic reconstitution and the tissue damage repair, control the whole body radiation damage and infection will be the key point for this kind of patient to survive.

Objective To observe the changes of serum high-sensitivity C-reactive protein (hs-CRP) in 2 patients diagnosed as acute radiation sickness, and to evaluate its clinical significance. Methods Two victims from Shandong province, China were accidentally received a 60 Co irradiation from a dropped 60 Co source in 2004. They were exposed to more than 20Gy (patient A) and 9Gy (patient B) of X-ray irradiation respectively. The patient A was diagnosed as extremely severe bone marrow form of acute radiation sickness (ARS), and patient B was diagnosed as having developed intestinal form of ARS. The two patients successfully got HLA-haploidentical (patient A) and HLA-identical (patient B) peripheral blood stem cell transplantation, and their hematopoiesis recovered, but they cached serious bacterial infection in whole clinical course. Hs-CRP was quantitatively detected by automatically immunoturbidimetric assay. Result The serum level of hs-CRP in the two patients elevated quickly when they suffered from serious bacterial infection, and declined markedly when the infection was controlled effectively. The serum level of hs-CRP also increased slightly when the patients suffered from severe damage on organs or skin function. There existed 3 peak values of hs-CRP level in patient A when kept in the hospital, with a highest value of 188.8mg/L; there existed 4 peak values of hs-CRP level in patient B when kept in the hospital, with the highest value of 377.2mg/L. Conclusion The present results suggested that hs-CRP may be a good indicator to acute radiation sickness complicated with serious bacterial infection, for the hs-CRP levels may fluctuate following the bacterial infection and effectively controlling.

Objective To practice the prevention and treatment of severe bone marrow form and intestine form of acute radiation sickness complicated by bacteria infection for providing an effective method on the treatment of acute radiation sickness. Methods Two patients with severe acute radiation sickness suffered from different infection during treatment. Based on their clinical symptoms, image analysis and the findings of microbiological culture, the patients underwent different anti-bacteria and anti-fungi treatment, and the results were evaluated. Result Repeated multiple bacterial infection companied with fungi infection occurred in the two patients with severe acute radiation sickness during the period of treatment. The bacterial infection was controlled temporarily by an intensively antibacterial and antimycotic treatment, but the fungi infection was uncontrolled. In patient A, acute peritonitis occurred 14 days after exposure, and pulmonary infection occurred 19 days after exposure. The pulmonary infection in patient A was controlled by using antibacterial drugs Tienam and Vancocin, while the patient died of multiple organ failure and fungi infection 33 days after exposure. In patient B, pulmonary infection occurred 17 days after exposure, and the septicemia occurred twice with Gram-negative bacteria at 55th day and 71st day after exposure. The pulmonary infection was controlled provisionally by using antibacterial drugs Tienam and Vancocin, while the patient died of multiple organ failure 75 days after exposure. Conclusion The bacterial infection companied with severe acute radiation sickness is phased occurrence. The generalized and phased application of intensive antibiotics might be an effective treatment.

To evaluate the effects of donor stem cell infusion (DSI) in patients after nonmyeloablative allogeneic peripheral blood stem cell transplantation( NAPBSCT),6 patients were infused donor stem cell in+7d～+90d consisting of MNC (0.6～7.6)?10 8 /kg, CD34 + cells (0.3～3.4)?10 6 /kg,CD3 + cells (0.3～5.1)?10 8 /kg.The results showed that 5/6 patients had definite effects in promoting donor chimeras after DSI,of these 3 achieved full donor chimeras following mixed chimeras ;4/6 have graft versus leukemia(GVL)effects.No hematopoiesis aplasia was found, and only one Ⅳdegree aGVHD developed related with DSI. It was concluded that DSI have definite GVL effects and can convert mixed chimeras to full chimeras without causing GVHD and severe hematopoietic aplasia.

To explore the risk factors of graft rejection in non-myeloablative transplantation between HLA-identical siblings and to evaluate methods to increase donor cell engraftment, 8 patients with graft rejection were studied . The results showed that the usage of immunosup-pressive agents, low early engraft rate, and the kind of disease being CML were closely related with graft rejectioa For patients with graft rejection, second non-myeloablative transplantation is a useful way.

Objective To compare the results of mobilization of peripheral stem cells of two different G-CSF dosage schedules in 30 healthy donors. Methods In one group 15 healthy subjects received 5?g/kg filgrastim once daily subcutaneously (SC), while in the other group another 15 individuals received 2.5?g/kg of filgrastim twice daily SC. Peripheral blood stem cells were collected after five days of filgrastim administration, and flow cytometric immunophenotyping was performed for the first harvest. Results The MNC count was 2.93?10 8/kg donor body weight in the 5?g/kg Qd group compared with 4.42?10 8/kg in the 2.5?g/kg bid group (P0.05). Conclusion Administration of filgrastim twice a day at 2.5?g/kg instead of once a day at 5?g/kg is more efficient in mobilizing stem cells without obvious side effect.

Objective To explore the clinical effects of second non-myeloablative stem cell transplantation (NAST). Methods Six cases of malignant hematological diseases receiving second NAST were retrospectively analyzed. Of them, 3 were suffered from transplant rejection after 1st NAST and the remaining 3 were stable mixed chimerism. Results Five of the patients achieved complete donor's chimerism and have been in disease-free-survival for 6～27 months. 1 GVHD occurred in only one of the 6 patients, and no transplant-related death happened. Conclusion Second NAST is effective for the treatment of patients with transplant rejection,and is also rational choice for those patients with refractory or relapse malignant hematological diseases.