Background:Acute myeloid leukemia(AML) with t(8;21) is a heterogeneous disease.Identifying AML patients with t(8;21) who have a poor prognosis despite achieving remission is important for determining the best subseque...Background:Acute myeloid leukemia(AML) with t(8;21) is a heterogeneous disease.Identifying AML patients with t(8;21) who have a poor prognosis despite achieving remission is important for determining the best subsequent therapy.This study aimed to evaluate the impact of Wilm tumor gene-1(WT1) transcript levels and cellular homolog of the viral oncogene v-KIT receptor tyrosine kinase(C-KIT) mutations at diagnosis,and RUNXTRUNX1T1 transcript levels after the second consolidation chemotherapy cycle on outcomes.Methods:Eighty-eight AML patients with t(8;21) who received chemotherapy only or allogeneic hematopoietic stem cell transplantation(allo-HSCT) were included.Patients who achieved remission,received two or more cycles of consolidation chemotherapy,and had a positive measureable residual disease(MRD) test result(defined as <3-log reduction in RUNX1-RUNX1T1 transcript levels compared to baseline) after 2-8 cycles of consolidation chemotherapy were recommended to receive allo-HSCT.Patients who had a negative MRD test result were recommended to receive further chemotherapy up to only 8 cycles.WT1 transcript levels and C-KIT mutations at diagnosis,and RUNX1-RUNX1T1 transcript levels after the second consolidation chemotherapy cycle were tested.Results:Patients who had a C-KIT mutation had significantly lower WTl transcript levels than patients who did not have a C-KIT mutation(6.7%± 10.6%vs.19.5%± 19.9%,P < 0.001).Low WTl transcript levels(<5.0%) but not C-KIT mutation at diagnosis,a positive MRD test result after the second cycle of consolidation chemotherapy,and receiving only chemotherapy were independently associated with high cumulative incidence of relapse in all patients(hazard ratio[HR]= 3.53,2.30,and 11.49;95%confidence interval[CI]1.64-7.62,1.82-7.56,and 4.43-29.82;P = 0.002,0.034,and <0.001,respectively);these conditions were also independently associated with low leukemia-free survival(HR =3.71,2.33,and 5.85;95%CI 1.82-7.56,1.17-4.64,and 2.75-12.44;P < 0.001,0.016,and <0.001,respectively) and overall s展开更多
目的:探讨胃肠间质瘤(gastrointestinal stomal tumors,GIST)患者肿瘤组织中c-Kit和PDGFRA基因各亚型突变情况的研究。方法:应用直接测序方法检测65例GIST石蜡组织中c-Kit基因9、11、1 3和1 7外显子和P D G F R A基因1 2和1 8外显子突...目的:探讨胃肠间质瘤(gastrointestinal stomal tumors,GIST)患者肿瘤组织中c-Kit和PDGFRA基因各亚型突变情况的研究。方法:应用直接测序方法检测65例GIST石蜡组织中c-Kit基因9、11、1 3和1 7外显子和P D G F R A基因1 2和1 8外显子突变情况。结果:G I ST肿瘤组织中c-K i t基因总突变率为63.08%(41/65),外显子9、11、13和17的突变率分别为23.08%(15/65)、35.38%(23/65)、1.54%(1/65)和3.08%(2/65);c-Kit基因各外显子之间双重突变共2例(3.08%),其中9外显子与11外显子双重突变1例(1.54%),11外显子与17外显子双重突变1例(1.54%);c-Kit基因11号外显子内双重突变2例(3.08%),三重突变1例(1.54%)。PDGFRA基因总突变率为3.08%(2/65),均为外显子18突变。c-Kit基因和PDGFRA基因双突变共存型1例(1.54%),为c-Kit基因13外显子V654L点突变和PDGFR A基因18外显子D842V点突变。结论:GIST患者中c-Kit基因存在较高的突变率,尤其为9和11外显子突变,其基因突变亚型分类能指导精准医学下伊马替尼的肿瘤靶向治疗,PD GF R A基因突变率和存在两种及其以上突变发生的发生概率虽低但不容忽视。展开更多
To report an extragastrointestinal stromal tumor （EGIST） that occurs outside the gastrointestinal tract and shows unique clinicopathologic and immunohistochemical features. In our case, we experienced multiple soft ...To report an extragastrointestinal stromal tumor （EGIST） that occurs outside the gastrointestinal tract and shows unique clinicopathologic and immunohistochemical features. In our case, we experienced multiple soft tissue tumors that originate primarily in the greater omentum, and in immunohistochemical analysis, the tumors showed features that correspond to malignant EGIST. Two large omental masses measured 15 cm×10 cm and 5 cm×4 cm sized and several small ovoid fragments were attached to small intestine, mesentery and peritoneum. On histologic findings, the masses were separated from small bowel serosa and had high mitotic count （115/50 HPFs）. In the results of immunohistochemical stains, the tumor showed CDl17 （c-kit） positive reactivity and high Ki-67 labeling index. On mutation analysis, the c-kit gene mutation was found in the juxtamembrane domain （exon 11）and it was heterozygote. Platelet-derived growth factor receptor （PDGFR） gene mutation was also found in the juxtamemembrane （exon 12） and it was polymorphism. From above findings, we proposed that there may be several mutational pathways to malignant EGIST, so further investigations could be needed to approach this unfavorable disease entity.展开更多
基金supported by Grants from the Key Program of the National Natural Science Foundation of China(81230013)the Major State Basic Research Development Program of China(973 Program,2013CB733701)+2 种基金the Nature Science Foundation of China(81170483,81570130 and 81370639)the Beijing Municipal Science and Technology Commission(Z141100000214011)support from the NIHR Biomedical Research Centre funding scheme
文摘Background:Acute myeloid leukemia(AML) with t(8;21) is a heterogeneous disease.Identifying AML patients with t(8;21) who have a poor prognosis despite achieving remission is important for determining the best subsequent therapy.This study aimed to evaluate the impact of Wilm tumor gene-1(WT1) transcript levels and cellular homolog of the viral oncogene v-KIT receptor tyrosine kinase(C-KIT) mutations at diagnosis,and RUNXTRUNX1T1 transcript levels after the second consolidation chemotherapy cycle on outcomes.Methods:Eighty-eight AML patients with t(8;21) who received chemotherapy only or allogeneic hematopoietic stem cell transplantation(allo-HSCT) were included.Patients who achieved remission,received two or more cycles of consolidation chemotherapy,and had a positive measureable residual disease(MRD) test result(defined as <3-log reduction in RUNX1-RUNX1T1 transcript levels compared to baseline) after 2-8 cycles of consolidation chemotherapy were recommended to receive allo-HSCT.Patients who had a negative MRD test result were recommended to receive further chemotherapy up to only 8 cycles.WT1 transcript levels and C-KIT mutations at diagnosis,and RUNX1-RUNX1T1 transcript levels after the second consolidation chemotherapy cycle were tested.Results:Patients who had a C-KIT mutation had significantly lower WTl transcript levels than patients who did not have a C-KIT mutation(6.7%± 10.6%vs.19.5%± 19.9%,P < 0.001).Low WTl transcript levels(<5.0%) but not C-KIT mutation at diagnosis,a positive MRD test result after the second cycle of consolidation chemotherapy,and receiving only chemotherapy were independently associated with high cumulative incidence of relapse in all patients(hazard ratio[HR]= 3.53,2.30,and 11.49;95%confidence interval[CI]1.64-7.62,1.82-7.56,and 4.43-29.82;P = 0.002,0.034,and <0.001,respectively);these conditions were also independently associated with low leukemia-free survival(HR =3.71,2.33,and 5.85;95%CI 1.82-7.56,1.17-4.64,and 2.75-12.44;P < 0.001,0.016,and <0.001,respectively) and overall s
文摘目的:探讨胃肠间质瘤(gastrointestinal stomal tumors,GIST)患者肿瘤组织中c-Kit和PDGFRA基因各亚型突变情况的研究。方法:应用直接测序方法检测65例GIST石蜡组织中c-Kit基因9、11、1 3和1 7外显子和P D G F R A基因1 2和1 8外显子突变情况。结果:G I ST肿瘤组织中c-K i t基因总突变率为63.08%(41/65),外显子9、11、13和17的突变率分别为23.08%(15/65)、35.38%(23/65)、1.54%(1/65)和3.08%(2/65);c-Kit基因各外显子之间双重突变共2例(3.08%),其中9外显子与11外显子双重突变1例(1.54%),11外显子与17外显子双重突变1例(1.54%);c-Kit基因11号外显子内双重突变2例(3.08%),三重突变1例(1.54%)。PDGFRA基因总突变率为3.08%(2/65),均为外显子18突变。c-Kit基因和PDGFRA基因双突变共存型1例(1.54%),为c-Kit基因13外显子V654L点突变和PDGFR A基因18外显子D842V点突变。结论:GIST患者中c-Kit基因存在较高的突变率,尤其为9和11外显子突变,其基因突变亚型分类能指导精准医学下伊马替尼的肿瘤靶向治疗,PD GF R A基因突变率和存在两种及其以上突变发生的发生概率虽低但不容忽视。
文摘To report an extragastrointestinal stromal tumor （EGIST） that occurs outside the gastrointestinal tract and shows unique clinicopathologic and immunohistochemical features. In our case, we experienced multiple soft tissue tumors that originate primarily in the greater omentum, and in immunohistochemical analysis, the tumors showed features that correspond to malignant EGIST. Two large omental masses measured 15 cm×10 cm and 5 cm×4 cm sized and several small ovoid fragments were attached to small intestine, mesentery and peritoneum. On histologic findings, the masses were separated from small bowel serosa and had high mitotic count （115/50 HPFs）. In the results of immunohistochemical stains, the tumor showed CDl17 （c-kit） positive reactivity and high Ki-67 labeling index. On mutation analysis, the c-kit gene mutation was found in the juxtamembrane domain （exon 11）and it was heterozygote. Platelet-derived growth factor receptor （PDGFR） gene mutation was also found in the juxtamemembrane （exon 12） and it was polymorphism. From above findings, we proposed that there may be several mutational pathways to malignant EGIST, so further investigations could be needed to approach this unfavorable disease entity.
