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Introduction: In this study, we aimed to compare the immunophenotype of tumor cells in children with B-cell precursor acute lymphoblastic leukemia (BCP-ALL) harboring rearrangements of the CRLF2 gene with that in children without such aberrations with a specific focus on the surface expression of the related protein thymic stromal lymphopoietin receptor (TSLPR).
Methods: We examined bone marrow samples from 46 patients with primary BCP-ALL who had CRLF2 rearrangements detected by FISH (CRLF2(+) cohort). A total of 140 consecutive patients with intact CRLF2 were included in a control CRLF2(-) cohort. TSLPR expression was studied by flow cytometry.
Results: The majority of CRLF2(+) patients were conventionally positive (≥20% positive cells) for TSLPR (33 of 46, 71.7%). Among the remaining children in this group, two were completely TSLPR-negative, seven had less than 10% TSLPR-positive cells, and four had between 10% and 20% TSLPR-positive cells. By contrast, the majority of CRLF2(-) patients had no TSLPR-positive cells (119 of 140, 85.0%), while in 15 cases (10.7%), the percentage of TSLPR-positive cells was below 10%, and in six cases (4.3%), it was between 10% and 20%. Receiver operator characteristic analysis revealed a threshold of only 1.6% TSLPR-positive cells for the effective prediction of the presence of CRLF2 rearrangement. Moreover, this threshold retained its predictive value when only children with low TSLPR positivity were studied.
Conclusion: When surface TSLPR is detected at the diagnosis of BCP-ALL, close attention should be given to the search for chromosomal aberrations involving CRLF2 at any level of expression.
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http://dx.doi.org/10.1111/ijlh.14028 | DOI Listing |
Int J Lab Hematol
June 2023
National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.
Introduction: In this study, we aimed to compare the immunophenotype of tumor cells in children with B-cell precursor acute lymphoblastic leukemia (BCP-ALL) harboring rearrangements of the CRLF2 gene with that in children without such aberrations with a specific focus on the surface expression of the related protein thymic stromal lymphopoietin receptor (TSLPR).
Methods: We examined bone marrow samples from 46 patients with primary BCP-ALL who had CRLF2 rearrangements detected by FISH (CRLF2(+) cohort). A total of 140 consecutive patients with intact CRLF2 were included in a control CRLF2(-) cohort.
Ann Hematol
August 2021
Department of Hematology, Postgraduate Institute of Medical Education and Research, Chandigarh, India, 160012.
The overexpression of cytokine receptor-like factor-2 (CRLF2) identified by anti-thymic stromal lymphopoietin receptor/TSLPR flow cytometry (FCM) has been reported as a screening tool for the identification of BCR-ABL1-like B-cell acute lymphoblastic leukemia/B-ALL with CRLF2 re-arrangement. TSLPR expression was studied prospectively in consecutive 478 B-ALLs (≤ 12 years (n = 244); 13-25 years (n = 129); > 25 years (n = 105)) and correlated with various hematological parameters and end-of-induction measurable residual disease (day 29; MRD ≥ 0.01% by 10-color FCM).
View Article and Find Full Text PDFAnn Allergy Asthma Immunol
February 2018
Department of Otorhinolaryngology, Head and Neck Surgery, Graduate School of Medicine, Chiba University, Chuo-ku, Chiba, Japan. Electronic address:
Background: An allergic rhinitis (AR) diagnosis is based on typical nasal symptoms and allergen sensitization testing. However, it is sometimes difficult to distinguish AR from non-AR, and it is especially difficult to identify the causal allergen for immunotherapy of patients with AR.
Objective: To identify differences among patients with AR, subjects with asymptomatic sensitization (AS), and subjects without sensitization (NS) that could facilitate the diagnosis of AR.
ORL J Otorhinolaryngol Relat Spec
November 2015
Department of Otolaryngology, Tokyo Women's Medical University, Tokyo, Japan.
Objective: The objective of this study was to investigate the expression of thymic stromal lymphopoietin (TSLP) and TSLP receptor (TSLPR) in Kimura's disease (KD).
Methods: Using parotid gland tissues from KD patients and control subjects, we quantified the expression levels of mRNA for TSLP, interleukin (IL)-25, IL-33, and their receptors by massively parallel sequencing. We also performed immunohistochemical analysis of TSLP and TSLPR, and counted cells immunoreactive for these proteins by the polymer immunocomplex and double immunofluorescence methods.
J Oral Pathol Med
November 2014
Department of Stomatology, Qilu Hospital and Institute of Stomatology, Shandong University, Jinan, Shandong, China.
Background: Oral lichen planus (OLP) is a chronic inflammatory disease of oral mucosa in which the CD8(+) T cell-mediated cytotoxicity is regarded as a major mechanism of pathogenesis. The main objective of this study is to investigate in situ expression and secretion of thymic stromal lymphopoietin (TSLP) in specimens and sera from patients with oral lichen planus.
Methods: Thirty-six patients with OLP and 35 donors enrolled in specimen and serum collection.
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