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Morales-García LJ, Pacheco-Delgado MS. Serum free light chain reference intervals in an Optilite and their influence on clinical guidelines. Clin Biochem 2021; 92:54-60. [PMID: 33662349 DOI: 10.1016/j.clinbiochem.2021.02.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 01/26/2021] [Accepted: 02/16/2021] [Indexed: 11/17/2022]
Abstract
BACKGROUND Serum free light chain (FLC) analysis has been incorporated into the International Myeloma Working Group guidelines for the diagnosis and management of all monoclonal gammopathies. These recommendations were solely based on a single assay method (Freelite assay) and instrument. Here, we establish new reference intervals (RIs) for kappa and lambda FLC and the kappa-lambda difference and sum and a new diagnostic range for kappa/lambda FLC ratio (K/L-FLC) in an Optilite turbidimeter (The Binding Site) with the Freelite assay. METHODS To establish new RIs, the CLSI EP28-A3C protocol was applied to 249 sample blood donors from Fuenlabrada, Spain, and the central 95% and total range were estimated. Samples from patients with polyclonal hypo- and hypergammaglobulinemia were used for the evaluation of K/L-FLC as a monoclonal proliferation index. RESULTS The new RIs and the new K/L-FLC diagnostic range for the Optilite (0.65-2.56 mg/L) are very different from those in on the guidelines (0.26-1.65 mg/L). We propose new RIs for the K - L difference and the K + L sum. Diagnostic range validation as a monoclonal proliferation index with samples with hypo- and hypergammaglobulinemia confirms this new range. CONCLUSIONS In this study, we present the FLC RI for Freelite reagents measured on an Optilite turbidimeter. These ranges are different from those provided by the manufacturer and from those used in most studies in the literature, which may lead to patient misclassification. Manufacturers and clinical laboratories must strive to provide RIs for the technology they are using and for their population.
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Affiliation(s)
- Luis J Morales-García
- Department of Clinical Laboratory, Hospital Universitario de Fuenlabrada, Camino del Molino 2, Fuenlabrada, Madrid 28942, Spain.
| | - María S Pacheco-Delgado
- Department of Clinical Laboratory, Hospital Universitario de Fuenlabrada, Camino del Molino 2, Fuenlabrada, Madrid 28942, Spain.
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2
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Guevara-Hoyer K, Ochoa-Grullón J, Fernández-Arquero M, Cárdenas M, Pérez de Diego R, Sánchez-Ramón S. Serum Free Immunoglobulins Light Chains: A Common Feature of Common Variable Immunodeficiency? Front Immunol 2020; 11:2004. [PMID: 32849664 PMCID: PMC7431983 DOI: 10.3389/fimmu.2020.02004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 07/24/2020] [Indexed: 12/23/2022] Open
Abstract
Serum free light chain (sFLC) is a recently proposed biomarker for CVID diagnosis. Most CVID patients present low or undetectable sFLC up to 10-fold lower compared to other primary antibody deficiencies. Given that κ and λ light chains are normally secreted in excess with respect to immunoglobulins, this finding points to an intrinsic defect of B cell differentiation in CVID. sFLC levels were prospectively evaluated in a cohort of 100 primary immunodeficiency (PID) patients and in 49 patients with secondary immunodeficiency to haematological malignancy (SID). CVID patients had significantly lower κ and/or λ values (mean: κ: 1.39 ± 1.7 mg/L and λ: 1.97 ± 2.24 mg/L) compared to "other PIDs" (κ: 13.97 ± 5.88 mg/L and λ: 12.92 ± 7.4 mg/L, respectively, p < 0.001 both), and SID (κ 20.9 ± 22.8 mg/L and λ 12.8 ± 8.7 mg/L, respectively, p < 0.001 both). The sum of kappa and lambda (sum κ + λ) in CVID patients (7.25 ± 7.90 mg/L) was significantly lower respect to other PIDs (26.44 ± 13.25 mg/L, p < 0.0001), and to SID patients (28.25 ± 26.24 mg/L, p = 0.0002). ROC analysis of the sum κ + λ disclosed an area under the curve (AUC) of 0.894 for CVID diagnosis (SD 0.031; 95% CI: 0.83-0.95, p < 0.0001), with optimal cut-off of 16.7 mg/L, giving the highest combination of sensitivity (92%), specificity (75%) and NPV (98%). The Relative Risk (RR) for patients presenting a sum κ + λ below 16.7 mg/L was 20.35-fold higher (95%, CI: 5.630-75.93) for CVID than below this threshold. A similar behavior of the sFLC in our CVID cohort with respect to previously published studies was observed. We propose a cut-off of sum κ + λ 16.7 with diagnostic application in CVID patients, and discuss potential specific defects converging in low or undetectable sFLC.
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Affiliation(s)
- Kissy Guevara-Hoyer
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain.,Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, Madrid, Spain.,Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
| | - Juliana Ochoa-Grullón
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain.,Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, Madrid, Spain.,Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
| | - Miguel Fernández-Arquero
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain.,Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, Madrid, Spain.,Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
| | - Mariacruz Cárdenas
- Clinical Analysis Department, Hospital Clínico San Carlos, Madrid, Spain
| | - Rebeca Pérez de Diego
- Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain.,Laboratory of Immunogenetics of Human Diseases, IdiPAZ Institute for Health Research, Madrid, Spain
| | - Silvia Sánchez-Ramón
- Department of Immunology, IML and IdSSC, Hospital Clínico San Carlos, Madrid, Spain.,Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, Madrid, Spain.,Immunodeficiency Interdepartmental Group (GIID), Madrid, Spain
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3
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Scarpa R, Pulvirenti F, Pecoraro A, Vultaggio A, Marasco C, Ria R, Altinier S, Compagno N, Firinu D, Plebani M, De Carli M, Matucci A, Vianello F, Vacca A, Spadaro G, Quinti I, Agostini C, Milito C, Cinetto F. Serum Free Light Chains in Common Variable Immunodeficiency Disorders: Role in Differential Diagnosis and Association With Clinical Phenotype. Front Immunol 2020. [PMID: 32296413 DOI: 10.3389/fimmu.2020.00319.] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We report on an observational, multicenter study of 345 adult CVID patients, designed to assess the diagnostic value and the clinical association of serum free light chain (sFLC) pattern in Common Variable Immunodeficiency disorders (CVID). Sixty CVID patients were tested twice in order to assess intraindividual variability of sFLC. As control groups we included 138 patients affected by undefined primary antibody defects (UAD), lymphoproliferative diseases (LPDs), and secondary antibody deficiencies not related to hematological malignancies (SID). CVID patients presented lower κ and λ chain concentration compared to controls, showing low intraindividual sFLC variability. On the basis of the sFLC pattern, patients were classified into four groups: κ-λ+, κ+λ-, κ-λ-, κ+λ+. The most common pattern in CVID patients was κ-λ- (51%), followed by κ-λ+, (25%), κ+λ+ (22%), and κ+λ- (3%). In UAD, LPD, and SID groups κ+λ+ was the most common pattern observed. By analyzing the possible association between sFLC patterns and disease-related complications of CVID, we observed that patients belonging to the κ-λ- group presented more commonly unexplained enteropathy compared to the κ+λ+ group and showed higher frequency of bronchiectasis and splenomegaly compared to both the κ-λ+ and κ+λ+ patients. When compared to the other groups, κ-λ- had also lower serum IgG, IgA, and IgM concentrations at diagnosis, lower frequency of CD27+IgD-IgM- switched memory B cells, and higher frequency of CD21low B cells, receiving earlier CVID diagnosis. Thus, lower levels of sFLC might be an epiphenomenon of impairment in B cell differentiation, possibly leading κ-λ- patients to a higher risk for bacterial infections and chronic lung damage. Based on these results, we suggest adding sFLC assay to the diagnostic work-up of hypogammaglobulinemia and during follow-up. The assay may be useful to differentiate CVID from other causes of hypogammaglobulinemia and to early detect monoclonal lymphoproliferation occurring over years. Moreover, since the sFLC pattern seems to be related to disease phenotypes and clinical manifestations of CVID and after confirmation by further studies, sFLC assay might be considered a promising prognostic tool for identifying patients at higher risk of developing enteropathy and chronic lung damage or splenomegaly. This will allow designing a tailored follow-up for CVID patients.
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Affiliation(s)
- Riccardo Scarpa
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
| | - Federica Pulvirenti
- Department of Infectious Diseases and Internal Medicine, University Hospital Policlinico Umberto I, Rome, Italy
| | - Antonio Pecoraro
- Department of Translational Medical Sciences, Center for Basic and Clinical Immunology Research, University of Naples Federico II, Naples, Italy
| | - Alessandra Vultaggio
- Immunoallergology Unit, Department Medical-Geriatric, AOU Careggi, Florence, Italy
| | - Carolina Marasco
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Roberto Ria
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Sara Altinier
- Department of Laboratory Medicine of the University Hospital of Padova, Padova, Italy
| | - Nicolò Compagno
- Hematology and Clinical Immunology, Department of Medicine-DIMED, University of Padova, Padova, Italy
| | - Davide Firinu
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Mario Plebani
- Department of Laboratory Medicine of the University Hospital of Padova, Padova, Italy
| | - Marco De Carli
- Department of Internal Medicine, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Andrea Matucci
- Immunoallergology Unit, Department Medical-Geriatric, AOU Careggi, Florence, Italy
| | - Fabrizio Vianello
- Hematology and Clinical Immunology, Department of Medicine-DIMED, University of Padova, Padova, Italy
| | - Angelo Vacca
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Giuseppe Spadaro
- Department of Translational Medical Sciences, Center for Basic and Clinical Immunology Research, University of Naples Federico II, Naples, Italy
| | - Isabella Quinti
- Department of Infectious Diseases and Internal Medicine, University Hospital Policlinico Umberto I, Rome, Italy.,Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Carlo Agostini
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
| | - Cinzia Milito
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Francesco Cinetto
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
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4
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Scarpa R, Pulvirenti F, Pecoraro A, Vultaggio A, Marasco C, Ria R, Altinier S, Compagno N, Firinu D, Plebani M, De Carli M, Matucci A, Vianello F, Vacca A, Spadaro G, Quinti I, Agostini C, Milito C, Cinetto F. Serum Free Light Chains in Common Variable Immunodeficiency Disorders: Role in Differential Diagnosis and Association With Clinical Phenotype. Front Immunol 2020; 11:319. [PMID: 32296413 PMCID: PMC7136404 DOI: 10.3389/fimmu.2020.00319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 02/10/2020] [Indexed: 12/12/2022] Open
Abstract
We report on an observational, multicenter study of 345 adult CVID patients, designed to assess the diagnostic value and the clinical association of serum free light chain (sFLC) pattern in Common Variable Immunodeficiency disorders (CVID). Sixty CVID patients were tested twice in order to assess intraindividual variability of sFLC. As control groups we included 138 patients affected by undefined primary antibody defects (UAD), lymphoproliferative diseases (LPDs), and secondary antibody deficiencies not related to hematological malignancies (SID). CVID patients presented lower κ and λ chain concentration compared to controls, showing low intraindividual sFLC variability. On the basis of the sFLC pattern, patients were classified into four groups: κ−λ+, κ+λ−, κ−λ−, κ+λ+. The most common pattern in CVID patients was κ−λ− (51%), followed by κ−λ+, (25%), κ+λ+ (22%), and κ+λ− (3%). In UAD, LPD, and SID groups κ+λ+ was the most common pattern observed. By analyzing the possible association between sFLC patterns and disease-related complications of CVID, we observed that patients belonging to the κ−λ− group presented more commonly unexplained enteropathy compared to the κ+λ+ group and showed higher frequency of bronchiectasis and splenomegaly compared to both the κ−λ+ and κ+λ+ patients. When compared to the other groups, κ−λ− had also lower serum IgG, IgA, and IgM concentrations at diagnosis, lower frequency of CD27+IgD–IgM– switched memory B cells, and higher frequency of CD21low B cells, receiving earlier CVID diagnosis. Thus, lower levels of sFLC might be an epiphenomenon of impairment in B cell differentiation, possibly leading κ−λ− patients to a higher risk for bacterial infections and chronic lung damage. Based on these results, we suggest adding sFLC assay to the diagnostic work-up of hypogammaglobulinemia and during follow-up. The assay may be useful to differentiate CVID from other causes of hypogammaglobulinemia and to early detect monoclonal lymphoproliferation occurring over years. Moreover, since the sFLC pattern seems to be related to disease phenotypes and clinical manifestations of CVID and after confirmation by further studies, sFLC assay might be considered a promising prognostic tool for identifying patients at higher risk of developing enteropathy and chronic lung damage or splenomegaly. This will allow designing a tailored follow-up for CVID patients.
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Affiliation(s)
- Riccardo Scarpa
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
| | - Federica Pulvirenti
- Department of Infectious Diseases and Internal Medicine, University Hospital Policlinico Umberto I, Rome, Italy
| | - Antonio Pecoraro
- Department of Translational Medical Sciences, Center for Basic and Clinical Immunology Research, University of Naples Federico II, Naples, Italy
| | - Alessandra Vultaggio
- Immunoallergology Unit, Department Medical-Geriatric, AOU Careggi, Florence, Italy
| | - Carolina Marasco
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Roberto Ria
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Sara Altinier
- Department of Laboratory Medicine of the University Hospital of Padova, Padova, Italy
| | - Nicolò Compagno
- Hematology and Clinical Immunology, Department of Medicine-DIMED, University of Padova, Padova, Italy
| | - Davide Firinu
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Mario Plebani
- Department of Laboratory Medicine of the University Hospital of Padova, Padova, Italy
| | - Marco De Carli
- Department of Internal Medicine, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Andrea Matucci
- Immunoallergology Unit, Department Medical-Geriatric, AOU Careggi, Florence, Italy
| | - Fabrizio Vianello
- Hematology and Clinical Immunology, Department of Medicine-DIMED, University of Padova, Padova, Italy
| | - Angelo Vacca
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Giuseppe Spadaro
- Department of Translational Medical Sciences, Center for Basic and Clinical Immunology Research, University of Naples Federico II, Naples, Italy
| | - Isabella Quinti
- Department of Infectious Diseases and Internal Medicine, University Hospital Policlinico Umberto I, Rome, Italy.,Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Carlo Agostini
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
| | - Cinzia Milito
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Francesco Cinetto
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Rare Disease Referral Center, Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy
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5
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Immunoglobulin E-an Innocent Bystander in Host Defense? J Clin Immunol 2018; 38:223-224. [PMID: 29450679 DOI: 10.1007/s10875-018-0482-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 02/04/2018] [Indexed: 10/18/2022]
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