Impact of KIT D816 mutation on salvage therapy in relapsed acute myeloid leukemia with t(8;21) translocation / 中华血液学杂志

Objective@#To evaluate the impact of KIT D816 mutation on the salvage therapy in relapsed acute myeloid leukemia (AML) with t(8;21) translocation. @*Method@#The characteristics of the first relapsed AML with t(8;21) translocation from 10 hospitals were retrospectively collected, complete remission (CR2) rate after one course salvage chemotherapy and the relationship between KIT mutation and CR2 rate was analyzed. @*Results@#68 cases were enrolled in this study, and 30 cases (44.1%) achieved CR2. All patients received KIT mutation detection, and KIT D816 mutation was identified in 26 cases. The KIT D816 positive group had significantly lower CR2 compared with non-KIT D816 group (23.1% vs 57.1%, χ2=7.559, P=0.006), and patients with longer CR1 duration achieved significantly higher CR2 than those with CR1 duration less than 12 months (74.1% vs 31.9%, χ2=9.192, P=0.002). KIT D816 mutation was tightly related to shorter CR1 duration. No significant difference of 2 years post relapse survival was observed between KIT D816 mutation and non-KIT D816 mutation group. @*Conclusion@#KIT D816 mutation at diagnosis was an adverse factor on the salvage therapy in relapsed AML with t(8;21) translocation, significantly related to shorter CR1 duration, and can be used for prediction of salvage therapy response. KIT D816 mutation could guide the decision-making of salvage therapy in relapsed AML with t(8;21) translocation.

Impairment in immunoregulatory capability of mesenchymal stem cells from multiple myeloma patients and role of it in the pathogenesis of myeloma bone disease / 中华微生物学和免疫学杂志

Objective To deplore the immunoregulatory function changes of mesenchymal stem cells(MSCs)from multiple myeloma(MM)patients and its effects on the pathogenesis of myeloma bone disease.Methods MSCs from MM patients and normal controls were isolated and the immunophenotype was detected.Real-time PCR was performed to detect the expressions of TGF-β1,TGF-β2,TGF-β3,IL-6,IL3,TNF-α,FasL and RANKL of MSCs.Transwell coculture systems were performed between MSCs and T cells.Lymphocyte proliferative assay was employed to detect the effect of MSCs on T cell proliferation.The effect of MSCs on T cell cycle and T cell activation markers CD25 and CD69 expression were analyzed by flow cytometry.Cleaved caspase 3 protein by western blot and hoechst 33258 staining were employed to detect the apotosis of T cells.Influence of T cells on the osteogenesis potential of MSCs were detected by Von kossa stain,real-time PCR and Western blot.Results MSCs from both MM patients and normal controls possessed similar morphology and immunophenotypes.MM derived MSCs exhibited increased expressions of TGF-β1,IL-6,IL-3,TNF-α and RANKL and decreased expression of TGF-β2,TGF-β3 and FasL.The inhibitory effect of MM derived MSCs on T cell proliferative ability was attenuated compared to control MSCs.MSCs from normal controls silence more T cells in Go/G1 phase than those from MM patients.The daupening effect of MM derived MSCs on activation-induced T apoptosis seemed to be enhanced.Expression of T cell activation markers were significantly inhibited by MSCs from normal controls.Both T cells cocultured with MM deprived MSCs and T cells directly from MM patients inhibited osteogenesis potential of MSCs from normal controls.Conclusion MSCs from MM patients showed impaired immunoregulatory capability on T cells.The activated T cells,in turn,inhibited the osteogenesis potential of MSCs.This may participate in the pathogenesis of myeloma bone disease.

Clinical Features of 110 Cases of Primary Extranodal Non-Hodgkin's Lymphoma / 中国肿瘤临床

Objective: To evaluate the incidence, clinical features, diagnosis and treatment of primary ex-tranodal non-Hodgkin' s lymphoma (PE-NHL). Methods: The data of 110 patients diagnosed as PE-NHL be-tween January 2001 and May 2008 were reviewed. Results: These PE-NHL patients counted 60.11% of the 183 malignant lymphoma patients at the same period. The primary sites affected were the gastrointestinal tract 21.82% (24/110), Waldeyer ring 10.91% (12/110), nasal cavity 9.10% (10/110), soft tissue 9.10% (10/110), mediastinum 7.27% (8/110) and other unusual sites 41.82% (46/110). Symptoms and signs of PE-NHL were not specific, and 77.27% of these cases had a swelling organ or lump of the primary organ affected. Ac-cording to the International Prognosis Index (IPI), the percentage of patients in low, intermediate, and high group was 41.11%, 44.44% and 14.44%, respectively. Immunophenotype was assayed in 93 cases. The per-centage of B-cell lymphoma was 69.90% while that of T-cell lymphoma was 30.10%. For those 95 cases treat-ed, the effective rate including complete remission (61.05%) and part remission (16.84%) was 77.89%, the median survival was 30 months, and the 5-year overall survival (OS) was 27%. While, for patients with prima-ry gastrointestinal non-Hodgkin' s lymphomas (PGIL), the complete remission rate, part remission rate and the effective rate was 65.21%, 17.39% and 82.80%, respectively. The median survival was 24 months, and the 5-year overall survival (OS) was 30%. Conclusion: PE-NHL is more common than nodal lymphoma. The symptoms and signs of PE-NHL of different sites are quite different. To improve the curative strategies of PE-NHL, it is important to make an allround understanding of PE-NHL and follow reasonable mode of diagno-sis and therapy.

Multipotency of adult stem cells derived from human amnion / 生物工程学报

Adult stem cells are drawing more and more attention due to the potential application in degenerative medicine without posing any moral problem. There is growing evidence showing that the human amnion contains various types of adult stem cell. Since amniotic tissue is readily available, it has the potential to be an important source of regenerative medicine material. In this study we tried to find multipotent adult stem cells in human amnion. We isolated stem cells from amniotic mesenchymal cells by limiting dilution assay. Similar to bone marrow derived mesenchymal stem cells, these cells displayed a fibroblast like appearance. They were positive for CD105, CD29, CD44, negative for haematopoietic (GlyA, CD31, CD34, CD45) and epithelial cell (pan-CK) markers. These stem cells had the potential to differentiate not only into osteogenic, adipogenic and endothelial lineages, but also hepatocyte-like cells and neural cells at the single-cell level depending on the culture conditions. They had the capacity for self-renewal and multilineage differentiation even after being expanded for more than 30 population doublings in vitro. So they may be an ideal stem cell source for inherited or degenerative diseases treatment.