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1.
Journal of Korean Medical Science ; : e128-2021.
Article in English | WPRIM | ID: wpr-892308

ABSTRACT

Background@#The optimal conditioning regimen in cord blood transplantation (CBT) needs to be determined. This study aimed to identify the impact of conditioning regimen on the outcome of CBT in children with acute leukemia. @*Methods@#Medical records of patients with acute leukemia who received CBT were retrospectively reviewed. @*Results@#A total of 71 patients were allocated into 2 groups; patients who received total body irradiation 10 Gy, cyclophosphamide 120 mg/kg, and fludarabine 75 mg/m 2 were named as the TCF group (n = 18), while the non-TCF group (n = 53) included patients conditioned with regimens other than the TCF regimen. All patients in the TCF group were successfully engrafted, while 22.6% in the non-TCF group (n = 12) failed to achieve donor-origin hematopoiesis (P = 0.028). The incidence of cytomegalovirus diseases was 5.6% in the TCF group and 30.2% in the non-TCF group (P = 0.029). The 5-year overall survival rates of the TCF and non-TCF groups were 77.8% and 44.2%, respectively (P = 0.017). @*Conclusion@#Patients conditioned with the TCF regimen achieved better engraftment and survival rates, less suffering from cytomegalovirus disease. Our data suggest that the TCF regimen is a preferred option for CBT in children with acute leukemia.

2.
Annals of Laboratory Medicine ; : 145-154, 2021.
Article in English | WPRIM | ID: wpr-874161

ABSTRACT

Background@#We developed an assay to measure DNA-incorporated 6-thioguanine (DNATG) and validated its clinical applicability in Korean pediatric patients with acute lymphoblastic leukemia (ALL) in order to improve individualized thiopurine treatment and reduce the life-threatening cytotoxicity. @*Methods@#The DNA-TG assay was developed based on liquid chromatography-tandem mass spectrometry, with isotope-labeled TG-d3 and guanine-d3 as internal standards.This method was applied to 257 samples of pediatric ALL patients. The DNA-TG level was compared with erythrocyte TG nucleotide (RBC-TGN) level in relation to the TPMT and NUDT15 genotypes, which affect thiopurine metabolism, using Spearman’s rank test and repeated measure ANOVA. @*Results@#For DNA-TG quantification, a linearity range of 10.0-5,000.0 fmol TG/µg DNA;bias for accuracy of –10.4% –3.5%; coefficient of variation for intra- and inter-day precision of 3.4% and 5.8% at 80 fmol TG/µg DNA and of 4.9% and 5.3% at 800 fmol TG/µg DNA, respectively; and recovery of 85.7%–116.2% were achieved without matrix effects or carry-over. The median DNA-TG level in the 257 samples was 106.0 fmol TG/µg DNA (interquartile range, 75.8–150.9). There was a strong correlation between DNA-TG and RBC-TGN levels (ρ = 0.68,ρ < 0.0001). The DNA-TG/RBC-TGN ratio was significantly higher in NUDT15 intermediate metabolizers (*1/*2 and *1/*3) than in patients with wildtype alleles (ρ < 0.0001). @*Conclusions@#This simple and sensitive method for measuring DNA-TG level can improve therapeutic drug monitoring for thiopurine treatment.

3.
Journal of Korean Medical Science ; : e128-2021.
Article in English | WPRIM | ID: wpr-900012

ABSTRACT

Background@#The optimal conditioning regimen in cord blood transplantation (CBT) needs to be determined. This study aimed to identify the impact of conditioning regimen on the outcome of CBT in children with acute leukemia. @*Methods@#Medical records of patients with acute leukemia who received CBT were retrospectively reviewed. @*Results@#A total of 71 patients were allocated into 2 groups; patients who received total body irradiation 10 Gy, cyclophosphamide 120 mg/kg, and fludarabine 75 mg/m 2 were named as the TCF group (n = 18), while the non-TCF group (n = 53) included patients conditioned with regimens other than the TCF regimen. All patients in the TCF group were successfully engrafted, while 22.6% in the non-TCF group (n = 12) failed to achieve donor-origin hematopoiesis (P = 0.028). The incidence of cytomegalovirus diseases was 5.6% in the TCF group and 30.2% in the non-TCF group (P = 0.029). The 5-year overall survival rates of the TCF and non-TCF groups were 77.8% and 44.2%, respectively (P = 0.017). @*Conclusion@#Patients conditioned with the TCF regimen achieved better engraftment and survival rates, less suffering from cytomegalovirus disease. Our data suggest that the TCF regimen is a preferred option for CBT in children with acute leukemia.

4.
Clinical Pediatric Hematology-Oncology ; : 120-123, 2020.
Article | WPRIM | ID: wpr-832104

ABSTRACT

Hereditary spherocytosis (HS) is the most common inherited red cell membrane disorder. Its main laboratory finding is anemia with reticulocytosis. However, in the case of an aplastic crisis, there may be no reticulocytosis, making the diagnosis of HS difficult. We present the case of a 4-year-old boy who initially presented with persistent fever and sore throat. His 8-year old brother also had anemia of unknown etiology, and his father had a history of splenectomy in his 20s. Physical examination revealed anemic conjunctivae and hepatosplenomegaly, and laboratory findings showed anemia with decreased reticulocyte count and elevated ferritin and lactate dehydrogenase levels. A peripheral blood smear showed microcytic hypochromic anemia with severe poikilocytosis (spherocytes, acanthocytes, schistocytes), and bone marrow examination revealed decreased erythroid cells and increased hemophagocytosis. Increased osmotic fragility was observed, and parvovirus B19 was detected using polymerase chain reaction. Hence, we established the diagnosis of hereditary spherocytosis manifested as an aplastic crisis caused by parvovirus B19 infection

5.
Journal of Korean Medical Science ; : e82-2020.
Article in English | WPRIM | ID: wpr-892004

ABSTRACT

Background@#This study aimed to investigate the incidence and clinical significance of segmental chromosomal aberrations (SCAs) in Korean patients with neuroblastoma. @*Methods@#Patients diagnosed with neuroblastoma from 2012 to 2018 were included for retrospective review. Fluorescence in situ hybridization (FISH) was used to analyze four SCAs (MYCN amplification, 1p deletion, 11q deletion, and 17q gain). Clinical characteristics at diagnosis, early tumor response (reduction in primary tumor volume and neuron-specific enolase level after the first three cycles of chemotherapy), and survival rates were compared according to SCAs. @*Results@#Among 173 patients with FISH results, 92 (53.2%) had at least one of the four SCAs, while 25 (14.5%) had two co-aberrations, and eight (4.6%) had three co-aberrations. SCAs detected in our study were MYCN amplification (n = 17, 9.8%), 1p deletion (n = 26, 15.2%), 11q deletion (n = 44, 25.6%), and 17q gain (n = 46, 27.1%). Patients with MYCN amplification showed a better early response but a worse survival than those without (5-year overall survival: 46.2% ± 13.1% vs. 88.6% ± 3.4%). Furthermore, 1p deletion was associated with a better early response but a worse survival; however, it was not an independent factor for survival. We could not find any prognostic significance associated with 11q deletion or 17q gain. @*Conclusion@#This is the first study investigating SCAs in Korean neuroblastoma patients. Prognostic significance of SCAs other than MYCN amplification was different from those reported in western countries. Further study with a larger cohort and longer follow-up is needed to confirm our findings.

6.
Journal of Korean Medical Science ; : e82-2020.
Article in English | WPRIM | ID: wpr-899708

ABSTRACT

Background@#This study aimed to investigate the incidence and clinical significance of segmental chromosomal aberrations (SCAs) in Korean patients with neuroblastoma. @*Methods@#Patients diagnosed with neuroblastoma from 2012 to 2018 were included for retrospective review. Fluorescence in situ hybridization (FISH) was used to analyze four SCAs (MYCN amplification, 1p deletion, 11q deletion, and 17q gain). Clinical characteristics at diagnosis, early tumor response (reduction in primary tumor volume and neuron-specific enolase level after the first three cycles of chemotherapy), and survival rates were compared according to SCAs. @*Results@#Among 173 patients with FISH results, 92 (53.2%) had at least one of the four SCAs, while 25 (14.5%) had two co-aberrations, and eight (4.6%) had three co-aberrations. SCAs detected in our study were MYCN amplification (n = 17, 9.8%), 1p deletion (n = 26, 15.2%), 11q deletion (n = 44, 25.6%), and 17q gain (n = 46, 27.1%). Patients with MYCN amplification showed a better early response but a worse survival than those without (5-year overall survival: 46.2% ± 13.1% vs. 88.6% ± 3.4%). Furthermore, 1p deletion was associated with a better early response but a worse survival; however, it was not an independent factor for survival. We could not find any prognostic significance associated with 11q deletion or 17q gain. @*Conclusion@#This is the first study investigating SCAs in Korean neuroblastoma patients. Prognostic significance of SCAs other than MYCN amplification was different from those reported in western countries. Further study with a larger cohort and longer follow-up is needed to confirm our findings.

7.
Neonatal Medicine ; : 102-110, 2019.
Article in Korean | WPRIM | ID: wpr-760576

ABSTRACT

PURPOSE: We investigated the effect of delayed elevation of thyrotropin (TSH) (deTSH) on gastrointestinal motility in very low birth weight infants (VLBWI). METHODS: This study retrospectively investigated 228 premature VLBWI aged ≥4 weeks with normal neonatal TSH screening test results and free serum thyroxine levels. Infants with serum TSH levels ranging from 5 to 10 µIU/mL were categorized as the deTSH group (n=76), when TSH was measured at 4 (n=53), 8 (n=20), or 12 (n=3) weeks of age. Serum TSH levels in the control group (n=152) were <5 µIU/mL. Multivariate logistic regression analysis was used to determine the risk factors for the development of deTSH. Covariance analysis was used to analyze the relationship between deTSH and gastrointestinal motility. RESULTS: The mean gestational age and birth weight were 29.11±2.25 weeks and 1,157.4±218.0 g, respectively. Risk factors affecting deTSH were dopamine administration (odds ratio [OR], 8.71; 95% confidence interval [CI], 1.80 to 42.05; P=0.007) and operation time (OR, 6.95; 95% CI, 1.43 to 33.75; P=0.016) when the cumulative operating time was ≥1 hour. The mean±standard deviation (SD) duration of a nil per os (NPO) status was significantly higher in the deTSH (99.57±134.99 hours) than in the control group (37.25±59.02 hours) (P from analysis of covariance [ANCOVA]=0.001). The mean±SD duration (33.84±22.34 days) of total parenteral nutrition (TPN) was considerably longer in the deTSH group than in the control group (27.68±13.08 days) (P from ANCOVA=0.003). CONCLUSION: Clinicians must consider deTSH in VLBWI showing feeding intolerance with a prolonged NPO and TPN status.


Subject(s)
Humans , Infant , Birth Weight , Dopamine , Gastrointestinal Motility , Gestational Age , Infant, Very Low Birth Weight , Logistic Models , Mass Screening , Parenteral Nutrition , Parenteral Nutrition, Total , Retrospective Studies , Risk Factors , Thyrotropin , Thyroxine
8.
Journal of Genetic Medicine ; : 115-119, 2018.
Article in English | WPRIM | ID: wpr-719102

ABSTRACT

The 16p11.2 microdeletion has been reported in patients with developmental delays and intellectual disability. The distal 220-kb deletion in 16p11.2 is associated with developmental delay, autism spectrum disorder, epilepsy, and obesity at a young age. We have reported a case of distal 16p11.2 deletion syndrome in a preterm infant with unusual facial morphology and congenital heart disease. We suggest using chromosome microarray analysis to detect chromosomal abnormalities in newborns, especially preterm infants with unusual morphologies.


Subject(s)
Humans , Infant, Newborn , Autism Spectrum Disorder , Chromosome Aberrations , Epilepsy , Gene Deletion , Heart Defects, Congenital , Infant, Premature , Intellectual Disability , Microarray Analysis , Obesity , Premature Birth
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