1
|
Ravkov EV, Ventura MF, Gudipaty S, Ng D, Delgado JC, Lin L. Converting an HLA-B27 flow assay from the BD FACSCanto to the BD FACSLyric. CYTOMETRY. PART B, CLINICAL CYTOMETRY 2024. [PMID: 39287115 DOI: 10.1002/cyto.b.22206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 08/02/2024] [Accepted: 08/28/2024] [Indexed: 09/19/2024]
Abstract
HLA-B27 is a major histocompatibility complex (MHC) class I antigen which exhibits strong association (90%) with ankylosing spondylitis. HLA-B27 detection in patients by flow cytometry is a widely used clinical test, performed on many different flow cytometer models. We sought to develop and validate a test conversion protocol for the HLA-B27 test performed on the BD FACSCanto to BD's newer FACSLyric flow cytometers. The development and validation experiments were performed using anti-HLA-B27*FITC/CD3*PE antibody-stained whole blood patient specimens. The anti-HLA-B27*FITC logarithmic median fluorescence (LMF) results on the BD FACSCanto were converted to median fluorescence intensity (MFI) values on the BD FACSLyric. Clustering of the HLA-B27 positive and negative values, using a 3rd order polynomial equation, resulted in a conversion of the BD FACSCanto cutoff values, negative (<150 LMF) and positive (≥160 LMF), to negative (<4530 MFI) and positive (≥6950 MFI) on the BD FACSLyric. Accuracy was assessed by comparing the flow results obtained on the BD FACSCanto and BD FACSLyric to a molecular PCR based assay. Additional validation parameters (compensation verification, intra- and inter-assay precision, and instrument comparison) were performed per the recommendations outlined in the Clinical and Laboratory Standards Institute (CLSI) H62 guidelines for validation of flow cytometry assays.
Collapse
Affiliation(s)
- Eugene V Ravkov
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
| | - Miguel F Ventura
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
| | - Swapna Gudipaty
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
| | - David Ng
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
- Department of Pathology, University of Utah School of Medicine, Salt Lake, Utah, USA
| | - Julio C Delgado
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
- Department of Pathology, University of Utah School of Medicine, Salt Lake, Utah, USA
| | - Leo Lin
- APUP Institute for Clinical and Experimental Pathology, Salt Lake, Utah, USA
- Department of Pathology, University of Utah School of Medicine, Salt Lake, Utah, USA
| |
Collapse
|
2
|
Dos Santos Angeli R, Ribeiro AL, Kohem CL, Xavier RM, Monticielo OA. Comparative study of two laboratory techniques for the detection of HLA-B27 in patients with axial spondyloarthritis: a cross-sectional analysis. Adv Rheumatol 2024; 64:42. [PMID: 38783377 DOI: 10.1186/s42358-024-00383-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 05/13/2024] [Indexed: 05/25/2024] Open
Abstract
BACKGROUND The diagnostic and prognostic relevance of Human Leukocyte Antigen B-27 (HLA-B27) in Axial Spondyloarthritis (AxSpA) is undeniable, with 70% of Ankylosing Spondylitis (AS) patients carrying the B27 gene, contrasted with a mere 4.35% in the general population. Flow cytometry (FC) and Polymerase Chain Reaction (PCR) have emerged as the predominant techniques for routine HLA-B27 typing. While various studies have compared these methods, none have catered to the unique characteristics of the Brazilian demographic. Therefore, this research aims to compare FC and PCR in a Brazilian cohort diagnosed with AxSpA. METHODS An analytical cross-sectional study was undertaken involving 62 AxSpA outpatients from a Brazilian University Hospital. Both FC and PCR-SSP assays were utilized to ascertain HLA-B27 typing. The outcomes (either confirming or refuting the allele's presence) underwent rigorous scrutiny. Agreement between the methodologies was assessed using the kappa statistic. A p-value of < 0.05 was deemed statistically significant. RESULTS Of the participants, 90.3% (n = 56) were HLA-B27 positive according to FC, while 79% (n = 49) were identified as positive using the PCR method. FC exhibited a sensitivity rate of 98% paired with a specificity of 38.5%. The Positive Predictive Value for FC stood at 85.7%, and the Negative Predictive Value was 83.5%. Consequently, the overall accuracy of the FC method was gauged at 85.5%. A kappa coefficient of κ = 0.454 was derived. CONCLUSIONS FC demonstrated noteworthy sensitivity and satisfactory accuracy in HLA-B27 detection, albeit with a reduced specificity when contrasted with PCR-SSP. Nevertheless, given its cost-effectiveness and streamlined operation relative to PCR, FC remains a pragmatic option for preliminary screening in clinical practice, especially in low-income regions. To optimize resource allocation, we advocate for a refined algorithm that initiates by assessing the relevance of HLA-B27 typing based on Choosing Wisely recommendations. It then leans on FC, and, if results are negative yet clinical suspicion persists, advances to PCR. This approach aims to balance diagnostic accuracy and financial prudence, particularly in regions contending with escalating medical costs.
Collapse
Affiliation(s)
- Ricardo Dos Santos Angeli
- Hospital de Clínicas de Porto Alegre, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - André Lucas Ribeiro
- Serviço de Reumatologia, Hospital de Clínicas de Porto Alegre - HCPA, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil.
| | - Charles Lubianca Kohem
- Serviço de Reumatologia, Hospital de Clínicas de Porto Alegre - HCPA, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
| | - Ricardo Machado Xavier
- Serviço de Reumatologia, Hospital de Clínicas de Porto Alegre - HCPA, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
| | - Odirlei André Monticielo
- Serviço de Reumatologia, Hospital de Clínicas de Porto Alegre - HCPA, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
| |
Collapse
|
3
|
Triggianese P, Fatica M, Caso F, Costa L, D'Antonio A, Tasso M, Greco E, Conigliaro P, Bergamini A, Fabiani C, Cantarini L, Chimenti MS. Rheumatologist's Perspective on Non-Infectious Uveitis: Patterns from Tertiary Referral Rheumatologic Clinics in Italy. Int J Mol Sci 2023; 24:ijms24119690. [PMID: 37298638 DOI: 10.3390/ijms24119690] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/05/2023] [Accepted: 05/27/2023] [Indexed: 06/12/2023] Open
Abstract
Non-infectious uveitis (NIU) can be an early or even the first extra-articular manifestation of systemic rheumatic diseases, or the first one; thus, rheumatologists are often involved in the diagnostic and therapeutic assessment of NIU. We evaluated 130 patients with a diagnosis of NIU who were admitted to two Italian rheumatologic clinics (Tor Vergata University Hospital in Rome, and Federico II University in Naples) from January 2018 to December 2021. Anterior uveitis (AU) occurred in 75.4% of patients, followed by posterior uveitis (PU, 21.5%); acute (54.6%) and recurrent (35.4%) NIU were more documented than chronic NIU (10%), and a bilateral involvement was observed in 38.7% of cases. Half of NIU cases were associated with spondyloarthritis (SpA); the remaining were affected by Behçet disease (BD)-related uveitis (13.9%) and idiopathic NIU (9.2%). HLA-B27+ patients (34.8%) had a higher prevalence of anterior and unilateral NIU (p = 0.005) with acute course (p = 0.04) than HLA-B27- patients. On the contrary, HLA-B51+ patients (19.6%) had mostly PU and bilateral NIU (p < 0.0001) and recurrent course (p = 0.04) than HLA-B51- patients. At the first rheumatologic referral, 117 patients (90%) received systemic treatments. Findings from this study demonstrate that rheumatologic referral has a pivotal role in the diagnostic work-up of NIU and may dramatically influence NIU-treatment strategies.
Collapse
Affiliation(s)
- Paola Triggianese
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Mauro Fatica
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Francesco Caso
- Department of Clinical Medicine and Surgery, School of Medicine and Surgery, University of Naples Federico II, 80131 Naples, Italy
| | - Luisa Costa
- Department of Clinical Medicine and Surgery, School of Medicine and Surgery, University of Naples Federico II, 80131 Naples, Italy
| | - Arianna D'Antonio
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Marco Tasso
- Department of Clinical Medicine and Surgery, School of Medicine and Surgery, University of Naples Federico II, 80131 Naples, Italy
| | - Elisabetta Greco
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Paola Conigliaro
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Alberto Bergamini
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Claudia Fabiani
- Ophthalmology Unit, Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Luca Cantarini
- Department of Medical Sciences, Surgery and Neurosciences, Research Center of Systemic Autoinflammatory Diseases and Behcet's Disease Clinic, University of Siena, 53100 Siena, Italy
| | - Maria Sole Chimenti
- Rheumatology, Allergology and Clinical Immunology, Department of "Medicina dei Sistemi", PhD in Immunology, Molecular Medicine and Applied Biotechnology, University of Rome Tor Vergata, 00133 Rome, Italy
| |
Collapse
|
4
|
Human Leukocyte Antigen (HLA) System: Genetics and Association with Bacterial and Viral Infections. J Immunol Res 2022; 2022:9710376. [PMID: 35664353 PMCID: PMC9162874 DOI: 10.1155/2022/9710376] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 05/08/2022] [Indexed: 12/19/2022] Open
Abstract
The human leukocyte antigen (HLA) system is one of the most crucial host factors influencing disease progression in bacterial and viral infections. This review provides the basic concepts of the structure and function of HLA molecules in humans. Here, we highlight the main findings on the associations between HLA class I and class II alleles and susceptibility to important infectious diseases such as tuberculosis, leprosy, melioidosis, Staphylococcus aureus infection, human immunodeficiency virus infection, coronavirus disease 2019, hepatitis B, and hepatitis C in populations worldwide. Finally, we discuss challenges in HLA typing to predict disease outcomes in clinical implementation. Evaluation of the impact of HLA variants on the outcome of bacterial and viral infections would improve the understanding of pathogenesis and identify those at risk from infectious diseases in distinct populations and may improve the individual treatment.
Collapse
|
5
|
Cornaby C, Schmitz JL, Weimer ET. Next-generation sequencing and clinical histocompatibility testing. Hum Immunol 2021; 82:829-837. [PMID: 34521569 DOI: 10.1016/j.humimm.2021.08.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/12/2021] [Accepted: 08/16/2021] [Indexed: 11/28/2022]
Abstract
Histocompatibility testing is essential for donor identification and risk assessment in solid organ and hematopoietic stem cell transplant. Additionally, it is useful for identifying donor specific alleles for monitoring donor specific antibodies in post-transplant patients. Next-generation sequence (NGS) based human leukocyte antigen (HLA) typing has improved many aspects of histocompatibility testing in hematopoietic stem cell and solid organ transplant. HLA disease association testing and research has also benefited from the advent of NGS technologies. In this review we discuss the current impact and future applications of NGS typing on clinical histocompatibility testing for transplant and non-transplant purposes.
Collapse
Affiliation(s)
- Caleb Cornaby
- McLendon Clinical Laboratories, UNC Health, Chapel Hill, NC, USA
| | - John L Schmitz
- McLendon Clinical Laboratories, UNC Health, Chapel Hill, NC, USA; Department of Pathology & Laboratory Medicine, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA
| | - Eric T Weimer
- McLendon Clinical Laboratories, UNC Health, Chapel Hill, NC, USA; Department of Pathology & Laboratory Medicine, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA.
| |
Collapse
|