Trafficking circuit of CD8+ T cells between the intestine and bone marrow governs antitumour immunity.

Immunotherapy elicits a systemic antitumour immune response in peripheral circulating T cells. However, the T cell trafficking circuit between organs and their contributions to antitumour immunity remain largely unknown. Here we show in multiple mouse leukaemia models that high infiltration of leukaemic cells in bone marrow (BM) stimulates the transition of CD8+CD44+CD62L+ central memory T cells into CD8+CD44-CD62L- T cells, designated as inter-organ migratory T cells (TIM cells). TIM cells move from the BM to the intestine by upregulating integrin ß7 and downregulating C-X-C motif chemokine receptor 3 during leukaemogenesis. Upon immunogenic chemotherapy, these BM-derived TIM cells return from the intestine to the BM through integrin α4-vascular cell adhesion molecule 1 interaction. Blocking C-X-C motif chemokine receptor 3 function boosts the immune response against leukaemia by enhancing T cell trafficking. This phenomenon can also be observed in patients with leukaemia. In summary, we identify an unrecognized intestine-BM trafficking circuit of T cells that contributes to the antitumour effects of immunogenic chemotherapy.

Allogeneic hematopoietic stem cell transplantation overcomes the poor prognosis in MLL-rearranged solid tumor therapy related-acute myeloid leukemia.

MLL rearrangement is very common in solid tumor therapy-related acute myeloid leukemia (t-AML). To investigated the prognosis of solid tumor MLL t-AML, 157 patients were divided into 3 groups: non-MLL t-AML (n=41), MLL t-AML (n=18) and MLL de novo AML (n=98). Of the 150 patients underwent anti-leukemia therapy, the complete remission (CR) was similar in MLL t-AML, non-MLL t-AML and MLL de novo AML (P=0.251). 3-years overall survival (OS) was 37.5%, 21.5% and 20.4% (P=0.046), and leukemia-free survival (LFS) was 28.0%, 32.2% and 22.7% (P=0.031), and the incidence of relapse was 30.0%, 50.4% and 53.5% (P=0.382), respectively, in the three groups. Multivariate analysis revealed that MLL t-AML was a risk factor while allo-HSCT was a protective factor for OS, LFS, and relapse (P<0.001, P<0.001 and P=0.005) (P=0.002, P<0.001 and P<0.001, respectively). The 3-years OS was 0%, 17.9% and 2.3% (P=0.038), and LFS was 0%, 23.1% and 3.3% (P=0.017), and relapse was 100%, 53.1% and 74.4% (P=0.001), respectively, among three groups in patients undergoing chemotherapy alone, while OS was 64.3%, 52.7% and 40.7% (P=0.713), LFS was 60.0%, 48.8% and 37.0% (P=0.934), and relapse was 25.0%, 47.4% and 47.5% (P=0.872), respectively, among these groups in patients undergoing allo-HSCT. Intriguingly, MLL t-AML was no longer risk factor for relapse and LFS (P=0.882 and P=0.484, respectively), and it became a favorable factor for OS (P=0.011) in patients undergoing allo-HSCT. In conclusion, MLL t-AML had poor prognosis compared with non-MLL t-AML and MLL de novo AML, but allo-HSCT might overcome the poor prognosis of MLL t-AML.

[Influence of FLT3-ITD Mutation and ITD Length on the Outcome on Patients with Acute Myeloid Leukemia].

OBJECTIVE: To explore the influence of FLT3-ITD mutation and ITD length on the overall survival (OS) and relapse free survival(RFS) in patients with non-M3 acute myeloid leukemia. METHODS: Clinical features and therapeutic effect were retrospectively analyzed in 75 AML patients with FLT3-ITD mutation and 76 FLT3-ITD- AML patients with a normal karotype from June 2011 to April 2016. Genomic DNA was amplified by PCR, and FLT3-ITD mutation length was analyzed by DNA sequencing in 40 patients. RESULTS: AML patients with FLT3-ITD mutation had higher WBC count and the ratio of BM blast cells at initial diagnosis was also higher than those in AML patients without FLT3-ITD mutation (95.13 vs 10.85)(P<0.01); 72% vs 59%(P<0.01). The CR rates in AML patients with FLT3-ITD mutation less than those in AML patients without FLT3-ITD mutation(70.42% vs 94.7%)(P<0.01). OS (P<0.01) and RFS (P<0.01) were significantly increased in patients with AML who received allo-HSCT as compared with the patients who received consolidation chemotherapy and similar to AML patients without FLT3-ITD mutation who received HSCT. Patients with maintenance sorafenib after HSCT had longer OS (P<0.05) and RFS (P<0.05) than controls. ITDs exceeding 60 bp in length were associated with decreasing OS as compared with shorter ITD in AML patients with FLT3-ITD mutation (P<0.05). OS and RFS were similar among the 2 groups receiving consolidation chemotherapy. Besides, the patients with allo-HSCT had shorter ITDs and longer OS than ITDs exceeding 60 bp (P<0.05) and similar to AML patients without FLT3-ITD mutation. CONCLUSION: AML patients with FLT3-ITD mutation has poorer outcome, among which the prognosis was worse in patients with ITD exceeding 60 bp, and the chemotherapy alone can not improve the prognosis of FLT3-ITD+. Allo-HSCT is an effective treatment for AML patients with FLT3-ITD mutation; Sorafenib appears to be an effective maintenance therapy after allo-HSCT in FLT3-ITD AML.

Human erythrocyte lifespan measured by Levitt's CO breath test with newly developed automatic instrument.

Existing standard techniques for erythrocyte (RBC) lifespan measurement, such as quantitation of labeling with isotopes or biotin, are cumbersome and time-consuming. Given that endogenous CO originates mainly from degraded RBCs, a team lead by Levitt developed a CO breath test to enable more efficient RBC lifespan estimation. The purpose of this study was to evaluate the reliability of Levitt's CO breath test method with our newly developed automatic instrument. RBC lifespan measurements conducted by Levitt's CO breath test method were conducted in 109 healthy subjects and 91 patients with chronic hemolytic anemia. In healthy subjects, the RBC lifespan was 126 ± 26 days, similar to values obtained with classical standard labeling methods. RBC lifespan did not differ significantly between males and females or between juveniles and adults, and did not correlate with age. To our knowledge, this datum represents an RBC lifespan average for the largest sample to date. In subjects with hemolytic anemia, RBC lifespan was 29 ± 14 days, which is significantly shorter than that of the healthy subjects (p = 0.001). Using 75 days as a cut-off, diagnostic accuracy for hemolytic anemia in the present study sample was 100%. In conclusion, the present results indicate that Levitt's CO breath test is an ideal method for human RBC lifespan measurement, and the newly developed automatic instrument is reliable and convenient for clinical practice.

Allo-HSCT for acute leukemia of ambiguous lineage in adults: the comparison between standard conditioning and intensified conditioning regimens.

Knowledge concerning the clinical and biological characteristics of acute leukemia of ambiguous lineage (ALAL) is limited so that there has been a lack of uniformity in treatment. In this report, we retrospectively investigated the effect of intensified conditioning on adult ALAL undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT). A total of 59 patients with ALAL (male in 37 cases and female in 22 cases) were consecutively enrolled in the data analyses. Twenty-four patients received the standard conditioning (total body irradiation (TBI) + cyclophosphamide (CY) or busulfan + CY protocol) and 35 received the intensified conditioning (TBI + CY + etoposide or fludarabine + cytarabine plus TBI + CY + etoposide protocol). Five-year transplant-related mortality was 17.6 ± 9.6 % and 25.5 ± 8.0 %, the 5-year overall survival (OS) post-transplantation was 23.8 ± 8.9 % and 64.0 ± 8.4 %, disease-free survival was 16.7 ± 7.6 % and 55.8 ± 9.4 %, the 5-year cumulative incidence of relapse was 80.8 ± 8.5 % and 28.8 ± 9.9 %, respectively, in the standard and the intensified group (P = 0.380, P = 0.029, P = 0.005, and P < 0.001). Both univariate and multivariate analysis indicated that the intensified conditioning regimen and acute graft-versus-host disease were favorable factors to reduce the relapse. The younger patients, patients with CR at the time of transplantation, and the intensified conditioning regimen were favorable factors to elevate the survival. In conclusion, intensified conditioning regimens followed by allo-HSCT might improve long-term survival and decrease relapse of leukemia in adult ALAL compared to the standard conditioning regimens.

[The outcome and safety of mesenchymal stem cells from bone marrow of a third party donor in treatment of secondary poor graft function following allogeneic hematopoietic stem cell transplantation].

OBJECTIVE: To evaluate the efficacy and safety of bone marrow-derived mesenchymal stem cells (MSC) from a third party donor for secondary poor graft function (PGF) following allogeneic hematopoietic stem cell transplantation(allo-HSCT). METHODS: Five patients with secondary PGF were treated with MSC at a dose of 1 x 10(6)/kg body weight at a median of 47 days (35 to 61) after secondary PGF. MSC were derived from bone marrow (BM) of HLA-disparate third party donors, cultured in vitro and infused without HSC. If absolute neutrophil cell (ANC) and platelet counts (PLT) did not reach the standardization of > 1.5 x 10(9)/L and > 50.0 x 10(9)/L, respectively, within 28-30 days after the first MSC treatment, a second MSC treatment was required. RESULTS: MSC were infused once in one patient and twice in four patients with an interval of 28 to 30 days. All patients obtained ANC and PLT recovery at a median of 34 (25 to 49) days and 47 (26 to 54) days, respectively, without toxic side effects within follow-up periods of median 761 (204-1491) days. Three patients developed Epstein-Barr virus (EBV) reactivation at 42, 48, 108 days after MSC infusion, respectively and two of the three coverted to posttransplant lymphoproliferative disorders (PTLD). CONCLUSION: MSC from a third party donor are effective to patients with secondary PGF following allo-HSCT, whether it might increase the risk of EBV reactivation and EBV-associated PTLD need further observation.

[Clinical significance of monitoring BK polyomavirus in patients after hematopoietic stem cell transplantation].

This study was aimed to establish a method for rapid detecting BK polyomavirus (BKV) and to investigate the feasibility and value used in leukemia patients undergoing hematopoietic stem cell transplantation. Primers were designed according to BKV gene sequence; the quantitative standards for BKV and a real-time fluorescent quantitative PCR for BKV were established. The BKV level in urine samples from 36 patients after hematopoietic stem cell transplantation were detected by established method. The results showed that the standard of reconstructed plasmid and real time fluorescent quantitative PCR method were successfully established, its good specificity, sensitivity and stability were confirmed by experiments. BKV was found in 55.56% of urine samples, and the BKV load in urine was 2.46 × 10(4) - 7.8 × 10(9) copy/ml. It is concluded that the establishment of real-time fluorescent quantitative PCR for BKV detection provides a method for early diagnosis of the patients with hemorrhagic cystitis after hematopoietic stem cell transplantation.

[A comparison of toxicity and efficacy between busulfan plus fludarabine and busulfan plus cyclophosphamide for allogeneic hematopoietic stem cell transplantation in acute myeloid leukemia].

OBJECTIVE: To compare the transplant-related toxicity and the efficacy of busulfan/fludarabine (Bu/Flu) and busulfan/cyclophosphamide (Bu/Cy) as conditioning regimen in allogeneic hematopoietic stem cell transplantation (allo-HSCT) for acute myeloid leukemia(AML) in the first complete remission (CR1). METHODS: Totally 32 AML-CR1 patients underwent allo-HSCT were divided into Bu/Cy (Bu 3.2 mg×kg(-1)×d(-1), 7 - 4 days before transplantation; Cy 60 mg×kg(-1)×d(-1), 3 - 2 days before transplantation) and Bu/Flu (Bu 3.2 mg×kg(-1)×d(-1), 5 - 2 days before transplantation; Flu 30 mg×m(-2)×d(-1), 6 - 2 days before transplantation) groups. The regimen-related toxicity (RRT), incidence and severity of graft-versus-host disease (GVHD), 3-year cumulative relapse rate, non-relapse mortality (NRM), 3-year event-free survival (EFS) rate and overall survival (OS) rate were compared between the two groups. RESULTS: The median follow-up duration was 617.5 (6 - 1261) days. All patients achieved successful engraftment on 30 day after transplantation. There were no significant differences in the median time to neutrophil engraftment (P = 0.121) and platelet engraftment (P = 0.171) between the two groups. The median duration of neutrophil count under 0.1×10(9)/L and platelet count under 20×10(9)/L in the Bu/Cy group were significantly longer than those in the Bu/Flu group (P = 0.000 and P = 0.047). The incidence of grades II-IV RRT were 68.8% and 25.0% (P = 0.032) in the Bu/Cy and the Bu/Flu groups, respectively. There were no significant differences in the incidence of acute GVHD (P = 0.149), chronic GVHD (P = 0.149), incidence of NRM (P = 0.333), 3-year cumulative relapse rates (P = 0.834), 3-year EFS rate (P = 0.362) and OS rate (P = 0.111) between the two groups. CONCLUSION: Compared with Bu/Cy, Bu/Flu is a myeloablative condition regimen with milder bone marrow suppression and lower RRT incidence rate in allogeneic HSCT for AML-CR1 patients without compromising the efficacy.

[Allogeneic hematopoietic stem cell transplantation for acute leukemias of ambiguous lineage in adults: a comparison between the conditioning of different intensities].

OBJECTIVE: To evaluate the efficacy of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in the conditioning of different intensities for acute leukemias of ambiguous lineage (ALAL). METHODS: A total of 38 ALAL patients were treated with two conditioning of different intensities in our hospital from March 2002 to August 2010. The standard conditioning included TBI + Cy or Bu + Cy, intensified conditioning included Fludarabine + Ara-C + TBI + Cy. Cyclosporine A (CsA) and methotrexate (MTX) were administered in patients with human leukocyte antigen-matched sibling donor. And CsA, MTX plus antihuman thymocyte globulin and/or mycophenolate were used in all patients with HLA-mismatched related donor and unrelated donors transplants for graft-versus-host disease (GVHD) prophylaxis. COX regression was used to evaluate the prognostic factors of ALAL. RESULTS: Among 38 ALAL patients, 19 received the standard conditioning while another 19 the intensified conditioning. All patients achieved hematopoietic reconstitution. The 5-year overall survival (OS) and the disease-free survival (DFS) were 35.5% and 25.7% respectively. The 5-year OS rates were 20.2% and 48.1% (P = 0.233) and DFS 6.5% and 43.1% (P = 0.031) in the standard and intensified conditioning groups respectively. The 5-year cumulative relapsing incidence was 58.9% in all patients and 87.6% vs 30.4% in the standard and intensified conditioning groups respectively (P = 0.003). Through a COX regression model for univariate analysis, the intensified conditioning and chronic GVHD were protective factors for DFS (P = 0.001, 0.031). CONCLUSION: The intensified conditioning in ALAL patients undergoing allo-HSCT may improve the long-term patient survival and decrease the relapse of leukemia. The graft versus leukemic effect has some efficacy in ALAL patients undergoing allo-HSCT.

Allogeneic hematopoietic stem cell transplantation for acute leukemia with Gilbert's syndrome.

Acute leukemia with coexisting Gilbert's syndrome treated by allogeneic hematopoietic stem cell transplantation (allo-HSCT) is rarely reported. Here we described a case whose transaminase levels were almost normal, although transient hyperbilirubinemia repeatedly happened during chemotherapy.

[Clinical features and prognosis in 49 patients with Castleman's disease].

OBJECTIVE: To analyze the clinical features and prognosis of patients with Castleman's disease (CD). METHODS: Clinical and pathological data of 49 patients with CD diagnosed in Peking Union Medical College Hospital from January 1990 to December 2007 were retrospectively analyzed. RESULTS: In patients with uni-centric CD (UCD), hyaline vascular type had the highest percentage (88.2%, 15/17), which was significantly higher than that of either plasma cell type (5.9%, 1/17) or mixed cell type (5.9%, 1/17) (P < 0.05). In patients with multicentric CD (MCD), there were no significant differences among the percentages of different histopathologic types. In contrast to patients with UCD, patients with MCD were relatively older and had more typical clinical features, more frequent complications, and more frequent abnormal laboratory results. Twenty patients with UCD achieved complete remission (CR) after surgery, and their complications also disappeared one month later. Twenty-three out of 29 patients with MCD were treated with chemotherapy; only 6 patients achieved CR and 9 achieved partial remission (PR), and the overall response rate was 65.2%. Two patients who initially did not responded to chemotherapy achieved CR after the addition of rituximab. CONCLUSIONS: The clinical features of CD are multifarious and nonspecific, and diagnosis is exclusively depended on histopathology. UCD has a good prognosis after surgery, while MCD often poorly responds to chemotherapy and has a relatively poor prognosis. New drugs and clinical trials are needed to improve the outcome of MCD.