Mutational spectrum and its prognostic significance in childhood acute lymphoblastic leukemia based on next-generation sequencing technology / 中华血液学杂志

Objective: This study analyzed the correlation between genetic mutation and prognostic significance in childhood acute lymphoblastic leukemia (ALL) . Methods: Targeted exome by next-generation sequencing (NGS) technology was used to carry out molecular profiling of untreated 141 children with ALL in Fujian Medical University Union Hospital from November 2016 to December 2019. Correlation of genetic features and clinical features and outcomes was analyzed. Results: Among the 141 pediatric patients with ALL, 160 somatic mutations were detected in 83 patients (58.9% ) , including 37 grade Ⅰ mutations and 123 grade Ⅱ mutations. Single nucleotide variation was the most common type of mutation. KRAS was the most common mutant gene (12.5% ) , followed by NOTCH1 (11.9% ) , and NRAS (10.6% ) . RAS pathway (KRAS, FLT3, PTPN11) , PAX5 and TP53 mutations were only detected, and NRAS mutations was mainly found in B-ALL while FBXW7 and PTEN mutations were only found, and NOTCH1 mutation was mainly detected in T-ALL. The average number of mutations detected in each child with T-ALL was significantly higher than in children with B-ALL (4.16±1.33 vs 2.04±0.92, P=0.004) . The children were divided into mutation and non-mutation groups according to the presence or absence of genetic variation. There were no statistically significant differences in sex, age, newly diagnosed white blood cell count, minimal or measurable residual disease monitoring results, expected 3-year event-free survival (EFS) and overall survival (OS) between the two groups (P>0.05) . On the other hand, the proportion of T-ALL and fusion gene negative children in the mutant group was significantly higher than the non-mutation group (P=0.021 and 0.000, respectively) . Among the patients without fusion gene, the EFS of children with grade I mutation was significantly lower than children without grade I mutation (85.5% vs 100.0% , P=0.039) . Among children with B-ALL, the EFS of those with TP53 mutation was significantly lower than those without TP53 mutation (37.5% vs 91.2% , P<0.001) . Conclusion: Genetic variation is more common in childhood ALL and has a certain correlation with clinical phenotype and prognosis. Therefore, targeted exome by NGS can be used as an important supplement to the traditional morphology, immunology, cytogenetics, and molecular biology classification.

Clinical Features and Prognosis of Acute Lymphoblastic Leukemia Children with P2RY8-CRLF2 Gene Rearrangement / 中国实验血液学杂志

OBJECTIVE@#To investigate the clinical features and prognostic factors of acute lymphoblastic leukemia (ALL) children with P2RY8-CRLF2 gene rearrangement.@*METHODS@#A total of 108 children with B-cell ALL (B-ALL) were diagnosed and systematically treated according to Chinese Children's Leukemia Group (CCLG) -ALL 2008 in our hospital from January 2016 to December 2016. The 108 patients were divided into two groups according to the result of mutiplex polymerase chain reaction: group with P2RY8-CRLF2 gene rearrangement and group without P2RY8-CRLF2 gene rearrangement. The ALL children with P2RY8-CRLF2 gene rearrangement were all treated by CCLG-ALL 2008 high-risk group (HR) regimens, and the ALL children in group without P2RY8-CRLF2 gene rearrangement received different intensity chemotherapy according to clinical risk classification.@*RESULTS@#Five (4 male and 1 female) out of 108 patients with B-ALL had P2RY8-CRLF2 gene rearrangement. In the 5 B-ALL patients with P2RY8-CRLF2 gene rearrangement, the median age of the was 4 (2-6) years old and the median WBC count was 26.2 (2.46-525.1)×10@*CONCLUSION@#The early treatment response and prognosis of ALL children with P2RY8-CRLF2 gene rearrangement are worse, and more effective protocol is needed for this subtype patients.

Clinical Effect and Safety of CCLG-ALL 2008 (high risk group) Protocol in the Treatment of Childhood Mixed Phenotype Acute Leukemia / 中国实验血液学杂志

OBJECTIVE@#To investigate the clinical effect and safety of Chinese Children's Leukemia Group (CCLG)-ALL 2008 (high risk group) protocol in the treatment with childhood Mixed phenotype acute leukemia (MPAL).@*METHODS@#The clinical data of 15 new diagnosed patients with MPAL treated in our hospital from January 2013 to December 2017 were retrospectively analyzed, and received CCLG-ALL 2008 (high risk group) protocol chemotherapy.@*RESULTS@#One patient gave up treatment after diagnosed, and 14 children with MPAL after induction remission chemotherapy, 3 patients gave up, and 5 patients received consolidation chemotherapy, and 6 patients received allogeneic hematopoietic stem cell transplantation (allo-HSCT). The complete remission (CR) rate was 85.7% at d33 of induction remission chemotherapy. The serious adverse event and treatment-related mortality (TRM) rate was 71.4% and 14.3%, respectively. The recurrence rate was 21.4% and the median time of relapse was 12(9.7-18.4) months. Except for 4 patients who gave up treatment, the 5-year event-free survival (EFS) rate in the other 11 patients was (54.5±15.0)%. The 5 years EFS of 4 patients who received consolidation chemotherapy was significantly lower than the 6 patients who received allo-HSCT after CR (25.0%±21.7% vs 83.3%±15.2%, P=0.033).@*CONCLUSION@#The CCLG-ALL2008 (for high-risk group) protocol in treatment of children with MPAL can get a high CR rate, but also with a high incidence of SAE. The patients received allo-HSCT after CR may have a good prognosis.

Effect of increasing the intensity of chemotherapy on the prognosis of acute lymphoblastic leukemia in children with IKZF1 deletion / 中国当代儿科杂志

OBJECTIVE@#To study the clinical features of acute lymphoblastic leukemia (ALL) in children with IKAROS family zinc finger 1 (IKZF1) deletion, and to observe the effect of increasing the intensity of chemotherapy on the prognosis of this disease.@*METHODS@#A total of 278 children diagnosed with ALL between December 2015 and February 2018 were systematically treated according to the Chinese Children's Leukemia Group-ALL 2008 protocol (CCLG-ALL 2008). The patients were divided into an IKZF1-deleted group and a control group according to the presence or absence of IKZF1. The IKZF1-deleted group was treated with the regimen for high-risk group (HR) in the CCLG-ALL 2008 protocol, while the control group received different intensities of chemotherapy according to clinical risk classification. The clinical features and event-free survival rate (EFS) were compared between the two groups.@*RESULTS@#A total of 24 (8.6%) cases of 278 children were found to have large deletions of exons of the IKZF1 gene. The IKZF1-deleted group had significantly higher proportions of cases with white blood cell count ≥50×10/L at initial diagnosis, BCR-ABL1 fusion gene positive, minimal residual disease ≥10% on the 15th day of induction remission treatment, minimal residual disease-high risk and clinical risk classification-high risk compared with the control group (P<0.05). The 3-year EFS rate (76%±10%) in the IKZF1-deleted group was lower than that in the control group (84%±4%), but with no significant difference between the two groups (P=0.282). The estimated 3-year EFS rate in the IKZF1-deleted-non-HR group (actually treated with the chemotherapy regimen for HR in the CCLG-ALL 2008 protocol) was 82%±12%, which was lower than that in the control-non-HR group (86%±5%), but there was no significant difference (P=0.436).@*CONCLUSIONS@#ALL children with IKZF1 deletion have worse early treatment response, and increasing the intensity of chemotherapy might improve the prognosis.

Clinical Features and Prognostic Factors of 18 Children with Anaplastic Large Cell Lymphoma / 中国实验血液学杂志

OBJECTIVE@#To analyze the clinical features and to explore the therapeutic efficacy and prognostic factors of children with anaplastic large cell lymphoma (ALCL).@*METHODS@#The clinical data of 18 children with ALCL admitted in Department of Pediatric Hematology, Union Hospital of Fujian Medical University from April 2011 to November 2017 was collected and analyzed.@*RESULTS@#The male to female ratio was 2∶1, the median age of onset was 6 (0.9-11.3) years old, and the B symptom was positive in 13 cases. The most common initial symptom was lymphadenopathy (in 17 cases). All patients were manifested with multiple organ involvements. 4 cases were classified as clinical stage Ⅱ, 11 cases as stage Ⅲ, and 3 cases as stage Ⅳ. Laboratory tests revealed 9 cases with leukocytosis and 8 cases with CRP＞20 mg/L. The pathological results showed all ALK-positive anaplastic large cell lymphoma with Ki-67 rate between 40%-90%. The median follow-up time was 41 months. 2 patients died before treatment, 1 patient was lost to follow-up. 15 patients accepted chemotherapy protocol of CCCG-BNHL-2011. 2 patients relapsed early, the 3 year event-free survival rate was (76.7±10.2)%. Kaplan-Meier survival analysis showed leukocytosis, increased CRP level, bone involvement and clinical stage were factors affecting prognosis.@*CONCLUSION@#ALCL is a relatively rare subtype of childhood non-Hodgkin's lymphoma with high invasiveness. Leukocytosis, increased CRP level, bone involvement and clinical stage are poor factors affecting the prognosis of patients.

Clinical Features and Prognosis of 35 Children with Burkitt Lymphoma/Leukemia / 中国实验血液学杂志

OBJECTIVE@#To investigate the clinical features and prognostic factors of childhood Burkitt Lymphoma/leukemia.@*METHODS@#The clinical data of 35 patients with newly-diagnosed childhood Burkitt lymphoma/leukemia from March 2011 to September 2017 in Fujian Medical University Union Hospital were retrospectively analyzed and summarized. Among 35 patients, 5 gave up treatment and one patient died of multiple organ failure before treatment, and 29 patients received CCCG-BNHL-2010 protocol chemotherapy.@*RESULTS@#The 35 cases of BL/L includsd 31 males and 4 females (M∶F=7.75∶1) with the median age of 5(2.0-11) years. Clinically, the common infiltration sites were as follows: abdominal organs (especially ileocecus, 21/35, 60%), bone marrow (21/35, 60%), faciomaxillary (10/35, 28.57%), and central nervous system (8/35, 22.85%). According to St. Jude staging system, 6 patients were grouped into stage Ⅱ, and 8 into stage Ⅲ and 21 into stage Ⅳ, among which the bone marrow blasts of 17 patients were more than 25%. The analysis of therapeutic efficacy and prognosis showed that in median follow up of 23.4 (5.3-86.4) months, 5 patients relapsed (5/29, 17.24%), the median relapsed time was 5.7 (3.9-7.2) months; tow-year overall survival (OS) rate and progression-free survival (PFS) rate was 79.2%±7.6% and 78.3%±7.9%, respectively. Univariate analysis showed that the 2-year OS and PFS in patients with LDH＞2N, stage Ⅳ (bone marrow infiltration), central nervous system infiltration and no-CR after 2 courses of treatnent all were significantly lower than those in patients with LDH≤2N, stageⅡ-Ⅲ, without central nervous system infiltration as well as CR after 2 course of treatment (P values were 0.015, 0.015, 0.019 and 0.000, respectively). Cox regression analysis showed that no-CR after 2 course was an independent unfavorable prognostic factor (HR 0.34, 95%CI: 0.03-0.407).@*CONCLUSION@#The childhood Buruitts lymphoma/leukemia is more freguently seen in males and school-age children, Advanced stage, bone marrow and contral nervous system infitration are common at the first visit to doctor, moreover the Burkitt's lymphoma/leykemia present repid progression and dangerous feature. The current intensive chemotherapy (high dose of drugs and short course) possess the significant therapeutic efficacy for this disease, but the patients should have very poor prognosis if they can not achieve CR after 2 course of chemotherapy.

Clinical features and prognosis of children with mature B-cell non-Hodgkin's lymphoma: an analysis of 28 cases / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the clinical features and treatment outcome of children with mature B-cell non-Hodgkin's lymphoma (B-NHL).</p><p><b>METHODS</b>A total of 28 previously untreated children with mature B-NHL were enrolled and given the chemotherapy regimen of CCCG-B-NHL-2010. Among them, 20 were given rituximab in addition to chemotherapy. The children were followed up for 31 months (ranged 4-70 months). A retrospective analysis was performed for the clinical features of these children. The Kaplan-Meier method was used for survival analysis. A univariate analysis was performed to investigate the prognostic factors.</p><p><b>RESULTS</b>Among the 28 children, 17 (61%) had Burkitt lymphoma, 8 (29%) had diffuse large B-cell lymphoma (DLBCL), and 3 (11%) had unclassifiable B-cell lymphoma. As for the initial symptom, 13 (46%) had cervical mass, 10 (36%) had maxillofacial mass, 9 (32%) had hepatosplenomegaly, 5 (18%) had abdominal mass, and 5 (18%) had exophthalmos. Of all children, 14 had a lactate dehydrogenase (LDH) level of <500 IU/L, 3 had a level of 500-1 000 IU/L, and 11 had a level of ≥ 1 000 IU/L. After two courses of chemotherapy, 21 children achieved complete remission and 7 achieved partial remission. At the end of follow-up, 24 achieved continuous complete remission and 4 experienced recurrence. The 2-year event-free survival rate was (85.7± 6.6)%. The children with bone marrow infiltration suggested by bone marrow biopsy, serum LDH ≥500 IU/L, and bone marrow tumor cells >25% had a low 2-year cumulative survival rate.</p><p><b>CONCLUSIONS</b>The CCCG-B-NHL 2010 chemotherapy regimen combined with rituximab has a satisfactory effect in the treatment of children with B-NHL. Bone marrow infiltration on bone marrow biopsy is associated with poor prognosis.</p>

Pathogens of infections in the induction period of childhood acute lymphoblastic leukemia and drug resistance of isolated strains / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To investigate the infections occurring in the induction period of childhood acute lymphoblastic leukemia (ALL), the pathogens of the infections, and drug resistance of isolated strains.</p><p><b>METHODS</b>A retrospective analysis was performed for the clinical data of 130 children with newly-diagnosed childhood ALL. Infections occurring during the induction chemotherapy, pathogenic strains, and drug-resistance spectrum were analyzed.</p><p><b>RESULTS</b>The incidence rate of clinical infection and/or microbial infection reached 76.2%. The lungs were the most common infection site (46.2%). The children with severe infection accounted for 52.3%, among whom 60 had pulmonary infection and/or 21 had sepsis. A total of 50 pathogenic strains were detected, which consisted of 29 bacterial strains and 21 fungal strains. Of all the children, 28.5% experienced infections caused by at least one microbe. Among the 29 bacterial strains, there were 19 (65.5%) Gram-negative bacteria and 10 (34.5%) Gram-positive bacteria. The most common Gram-negative bacteria were Klebsiella pneumoniae, Escherichia coli, and Pseudomonas aeruginosa, which were 100% sensitive to imipenem. The most common Gram-positive bacterium was Streptococcus viridans, which was 100% sensitive to vancomycin. The infections caused by fungi accounted for 16.2%, with Candida albicans as the most common fungus. Compared with those with non-severe infections, the children with severe infections had a significantly shorter time to the occurrence of agranulocytosis, a significantly longer duration of agranulocytosis, significantly higher incidence of fever and C-reactive protein (CRP) level, and a significantly longer length of hospital stay (P<0.05).</p><p><b>CONCLUSIONS</b>Pulmonary infections are common in the induction period of childhood ALL. Gram-negative bacteria are the most common pathogenic bacteria. Severe infections can be controlled by carbapenems combined with vancomycin and antifungal agents.</p>

Children's NK/T Cell Lymphoma-Associated Hemophagocytic Syndrome: Clinical Analysis of 6 Cases / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To study the clinical features, treatment and prognosis of patients with NK/T cell lymphoma-associated hemophagocytic syndrome(NK/T-LAHPS).</p><p><b>METHODS</b>Retrospective analysis was used to explore the clinical data of 6 children with NK/T-LAHPS who were admitted in Department of Pediatric Hematology of Fujian Medical University Union Hospital from July 2012 to June 2016. The 6 patients included 4 boys and 2 girls, with a median age of 4 years(range 1.75 to 11). In 4 patients the hemophagocytic syndrome(HPS) occurred as the main primary manifestations of underlying lymphoma, in the other 2 patients HPS occurred during lymphoma progression. The clinical manifestations included persistent fever(6/6), hepatomegaly(6/6), splenomegaly(6/6) and pancytopenia(6/6). Laboratory data indicated that the level of ferritin(2179-15000 ng/ml) , LDH(608-3899 IU/L) and EBV-DNA(>10copies/ml ) was elevated obviously. The other common clinical features of NK/T-LAHPS were hypoproteinemia(6/6), hepatic dysfunction(5/6), hypofibrinogenimia(5/6), hypertriglyceridemia(3) and hemophagocytosis in bone marrow(5/6).</p><p><b>RESULTS</b>After being treated according to the HLH-2004 protocol combined with supported therapy for 1 or 2 weeks, all the patients achieved a clinical response, and the laboratory indicators of HPS were improved. The combined chemotherapy of SMILE was given to 4 patients timely, among them 2 patients achieved complete remission(CR) and long term survival, 1 patient achieved partial remission(PR) and died of relapse after drug withdrawal and 1 patient died of aggravated lymphoma. The other 2 patients did not receive chemotherapy in time, HPS relapsed quickly, because of the progression of lymphoma, and all died of severe hepatic dysfunction and coagulopathy.</p><p><b>CONCLUSION</b>The NK/T-LAHPS is an invariably fatal disease with poor prognosis, and typically occurrs at the advanced stage or the terminal phase of the disease. HLH-2004- based protocol in combination with comprehensive therapy is hopeful for the patients with NK/T-LAHPS, which may delay the disease progression and provide opportunities for the treatment of primary disease. Once the laboratory indicators of HPS are improved, it is important to treat lymphoma timely with the combined chemotherapy of SMILE, which is significant for improving the prognosis.</p>