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Sciortino S, Graham S, Bishop T. Diagnostic Transitions of Cystic Fibrosis and Related Metabolic Syndrome Compared After 12 Years of Newborn Screening in California. J Pediatr 2024:114287. [PMID: 39233118 DOI: 10.1016/j.jpeds.2024.114287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 08/22/2024] [Accepted: 08/27/2024] [Indexed: 09/06/2024]
Abstract
OBJECTIVE To compare the long-term diagnostic transitions for cystic fibrosis (CF) and CF-Related Metabolic Syndrome (CRMS) side-by-side during follow-up since the onset of newborn screening in California. STUDY DESIGN Using real-world data, we conducted a retrospective cohort study to compare long-term observations of CRMS and CF in California and the diagnostic transitions from one to the other using clinical and diagnostic metrics. The California Genetic Disease Screening Program (GDSP) newborn screening for CF employs an immunoreactive trypsinogen tier-1 laboratory test, followed by molecular testing. This approach captures CF and CRMS, a diagnosis of "watchful waiting" among infants at risk for CF but with signs and symptoms that may emerge outside the screening window. Waiting entails periodic diagnostic reviews that can continue for many years; GDSP routinely conducts five years of follow-up for each child identified with a disorder. We utilized categorial logistic regression to compare the transitions with CRMS. RESULTS After screening 5,944,700 newborns between July 2007 and July 2019, 694 CF cases and 1,258 CRMS cases were identified. Of the 1,258 CRMS cases, 66 (5.2%, 95% CI=3.9%,6.4%) transitioned from CRMS to CF (CRMS2CF) at a mean age of 3.3 years (median=2.9 years). CRMS2CF cases had longer follow-up periods and were more likely later to develop positive sweat chloride and fecal elastase test results after 6 months of life than other CRMS cases. CONCLUSION These results suggest that children who have a CRMS2CF transition are more likely to develop positive biochemical markers than other CRMS patients and have few clinical indications during the first five years of follow-up.
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Affiliation(s)
- Stanley Sciortino
- Genetic Disease Screening Program, Center for Family Health, California Dept. of Public Health, Richmond, CA.
| | - Steve Graham
- Genetic Disease Screening Program, Center for Family Health, California Dept. of Public Health, Richmond, CA.
| | - Tracey Bishop
- Genetic Disease Screening Program, Center for Family Health, California Dept. of Public Health, Richmond, CA.
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2
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Godoy C, Brito PP, Amorim T, Souza EL, Boa-Sorte N. IRT/IRT as a newborn cystic fibrosis screening method: optimal cutoff points for a mixed population. CAD SAUDE PUBLICA 2024; 40:e00150623. [PMID: 39194088 PMCID: PMC11349280 DOI: 10.1590/0102-311xen150623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 03/27/2024] [Accepted: 04/01/2024] [Indexed: 08/29/2024] Open
Abstract
The Brazilian Unified National Health System (SUS) has incorporated newborn screening for cystic fibrosis since 2001. The protocol involves two samples of immunoreactive trypsinogen (IRT1/IRT2). This study aims to analyze fixed and floating values at the first and second IRT (IRT1/IRT2) cutoff points and assess the accuracy of the IRT/IRT methodology in a population from Northeastern Brazil. Descriptive, individual-level data from the newborn screening reference service data system (2013-2017) were used in this observational population study. The sensitivity, specificity, and positive predictive values (PPV) for the protocol were calculated. The best cutoff point was determined using the Youden's index. The previous year's cut-off values for the IRT1 and IRT2 99.4-, 99.5-, 99.6-, and 99.7-percentiles were utilized for the floating cutoff. During the studied period, 840,832 newborns underwent screening for cystic fibrosis, obtaining 49 cystic fibrosis diagnoses: 39 by newborn screening (79.6%) and 10 (20.4%) by clinical suspicion (false negative). The sensitivity, specificity, and PPV of the protocol totaled 79.6%, 99.9%, and 6.1%, respectively. No proposed cutoff for IRT1 performed better than the current one. IRT2 performed similarly to the current protocol at a cutoff point of 90ng/mL, showing the appropriate sensitivity and specificity while reducing the frequency of false positives. The protocol to screen newborns for cystic fibrosis had low sensitivity, a predictive positive value, and a high number of false positives and negatives. A floating cut point for IRT1 or IRT2 seems to constitute no viable option. However, changing the IRT2 cut point from 70ng/mL to 90ng/mL seems to have advantages and should undergo consideration.
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Affiliation(s)
- Carolina Godoy
- Programa de Pós-graduação em Medicina e Saúde, Universidade Federal da Bahia, Salvador, Brasil
| | | | - Tatiana Amorim
- Associação de Pais e Amigos dos Excepcionais, Salvador, Brasil
- Universidade do Estado da Bahia, Salvador, Brasil
| | - Edna Lúcia Souza
- Programa de Pós-graduação em Medicina e Saúde, Universidade Federal da Bahia, Salvador, Brasil
| | - Ney Boa-Sorte
- Programa de Pós-graduação em Medicina e Saúde, Universidade Federal da Bahia, Salvador, Brasil
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3
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Maier P, Jeyaweerasinkam S, Eberhard J, Soueidan L, Hämmerling S, Kohlmüller D, Feyh P, Gramer G, Garbade SF, Hoffmann GF, Okun JG, Sommerburg O. Influence of Season, Storage Temperature and Time of Sample Collection in Pancreatitis-Associated Protein-Based Algorithms for Newborn Screening for Cystic Fibrosis. Int J Neonatal Screen 2024; 10:5. [PMID: 38248633 PMCID: PMC10801509 DOI: 10.3390/ijns10010005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/16/2023] [Accepted: 01/04/2024] [Indexed: 01/23/2024] Open
Abstract
Newborn screening (NBS) for cystic fibrosis (CF) based on pancreatitis-associated protein (PAP) has been performed for several years. While some influencing factors are known, there is currently a lack of information on the influence of seasonal temperature on PAP determination or on the course of PAP blood concentration in infants during the first year of life. Using data from two PAP studies at the Heidelberg NBS centre and storage experiments, we compared PAP determinations in summer and winter and determined the direct influence of temperature. In addition, PAP concentrations measured in CF-NBS, between days 21-35 and 36-365, were compared. Over a 7-year period, we found no significant differences between PAP concentrations determined in summer or winter. We also found no differences in PAP determination after 8 days of storage at 4 °C, room temperature or 37 °C. When stored for up to 3 months, PAP samples remained stable at 4 °C, but not at room temperature (p = 0.007). After birth, PAP in neonatal blood showed a significant increasing trend up to the 96th hour of life (p < 0.0001). During the first year of life, blood PAP concentrations continued to increase in both CF- (36-72 h vs. 36-365 d p < 0.0001) and non-CF infants (36-72 h vs. 36-365 d p < 0.0001). Seasonal effects in central Europe appear to have a limited impact on PAP determination. The impact of the increase in blood PAP during the critical period for CF-NBS and beyond on the applicability and performance of PAP-based CF-NBS algorithms needs to be re-discussed.
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Affiliation(s)
- Pia Maier
- Centre for Paediatric and Adolescent Medicine, Department of General Paediatrics, Division of Neuropaediatrics and Metabolic Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany (G.G.); (G.F.H.)
| | - Sumathy Jeyaweerasinkam
- Department of Paediatrics, SLK-Kliniken Heilbronn GmbH, Am Gesundbrunnen 20–26, 74078 Heilbronn, Germany;
| | - Janina Eberhard
- Centre for Paediatric and Adolescent Medicine, Department of Neonatology, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany;
| | - Lina Soueidan
- Dietmar-Hopp Centre for Metabolic Diseases Heidelberg, University Hospital Heidelberg, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany; (L.S.); (D.K.); (P.F.); (S.F.G.); (J.G.O.)
| | - Susanne Hämmerling
- Centre for Paediatric and Adolescent Medicine, Division of Pediatric Pulmonology & Allergy and Cystic Fibrosis Center, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany;
- Translational Lung Research Center (TLRC), German Lung Research Center (DZL), University of Heidelberg, Im Neuenheimer Feld 130.3, 69120 Heidelberg, Germany
| | - Dirk Kohlmüller
- Dietmar-Hopp Centre for Metabolic Diseases Heidelberg, University Hospital Heidelberg, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany; (L.S.); (D.K.); (P.F.); (S.F.G.); (J.G.O.)
| | - Patrik Feyh
- Dietmar-Hopp Centre for Metabolic Diseases Heidelberg, University Hospital Heidelberg, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany; (L.S.); (D.K.); (P.F.); (S.F.G.); (J.G.O.)
| | - Gwendolyn Gramer
- Centre for Paediatric and Adolescent Medicine, Department of General Paediatrics, Division of Neuropaediatrics and Metabolic Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany (G.G.); (G.F.H.)
- University Children’s Hospital, University Medical Center Hamburg-Eppendorf, Martinistraße 52, 20246 Hamburg, Germany
| | - Sven F. Garbade
- Dietmar-Hopp Centre for Metabolic Diseases Heidelberg, University Hospital Heidelberg, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany; (L.S.); (D.K.); (P.F.); (S.F.G.); (J.G.O.)
| | - Georg F. Hoffmann
- Centre for Paediatric and Adolescent Medicine, Department of General Paediatrics, Division of Neuropaediatrics and Metabolic Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany (G.G.); (G.F.H.)
| | - Jürgen G. Okun
- Dietmar-Hopp Centre for Metabolic Diseases Heidelberg, University Hospital Heidelberg, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany; (L.S.); (D.K.); (P.F.); (S.F.G.); (J.G.O.)
| | - Olaf Sommerburg
- Centre for Paediatric and Adolescent Medicine, Division of Pediatric Pulmonology & Allergy and Cystic Fibrosis Center, University Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany;
- Translational Lung Research Center (TLRC), German Lung Research Center (DZL), University of Heidelberg, Im Neuenheimer Feld 130.3, 69120 Heidelberg, Germany
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Xue A, Lénárt I, Kincs J, Szabó H, Párniczky A, Balogh I, Deák A, Monostori PB, Hegedűs K, Szabó AJ, Szatmári I. Neonatal Screening for Cystic Fibrosis in Hungary-First-Year Experiences. Int J Neonatal Screen 2023; 9:47. [PMID: 37754773 PMCID: PMC10531581 DOI: 10.3390/ijns9030047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/09/2023] [Accepted: 08/15/2023] [Indexed: 09/28/2023] Open
Abstract
The aim of this study is to evaluate the strategy of the cystic fibrosis newborn screening (CFNBS) programme in Hungary based on the results of the first year of screening. A combined immunoreactive trypsinogen (IRT) and pancreatitis-associated protein (PAP) CFNBS protocol (IRT/IRT×PAP/IRT) was applied with an IRT-dependent safety net (SN). Out of 88,400 newborns, 256 were tested screen-positive. Fourteen cystic fibrosis (CF) and two cystic fibrosis-positive inconclusive diagnosis (CFSPID) cases were confirmed from the screen-positive cases, and two false-negative cases were diagnosed later. Based on the obtained results, a sensitivity of 88% and a positive predictive value (PPV) of 5.9% were calculated. Following the recognition of false-negative cases, the calculation method of the age-dependent cut-off was changed. In purely biochemical CFNBS protocols, a small protocol change, even after a short period, can have a significant positive impact on the performance. CFNBS should be monitored continuously in order to fine-tune the screening strategy and define the best local practices.
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Affiliation(s)
- Andrea Xue
- Paediatric Centre, MTA Centre of Excellence, Semmelweis University, 1083 Budapest, Hungary
| | - István Lénárt
- Department of Paediatrics, Albert Szent-Györgyi Medical School, University of Szeged, 6725 Szeged, Hungary
| | - Judit Kincs
- Paediatric Centre, MTA Centre of Excellence, Semmelweis University, 1083 Budapest, Hungary
| | - Hajnalka Szabó
- Department of Paediatrics, Albert Szent-Györgyi Medical School, University of Szeged, 6725 Szeged, Hungary
| | | | - István Balogh
- Division of Clinical Genetics, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Anna Deák
- Division of Clinical Genetics, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Péter Béla Monostori
- Department of Paediatrics, Albert Szent-Györgyi Medical School, University of Szeged, 6725 Szeged, Hungary
| | - Krisztina Hegedűs
- Paediatric Centre, MTA Centre of Excellence, Semmelweis University, 1083 Budapest, Hungary
| | - Attila J. Szabó
- Paediatric Centre, MTA Centre of Excellence, Semmelweis University, 1083 Budapest, Hungary
| | - Ildikó Szatmári
- Paediatric Centre, MTA Centre of Excellence, Semmelweis University, 1083 Budapest, Hungary
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5
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Ramasli Gursoy T, Asfuroglu P, Sismanlar Eyuboglu T, Aslan AT, Yilmaz AI, Unal G, Kibar BS, Pekcan S, Hangul M, Kose M, Budakoglu II, Acican D. Evaluation of specificity and sensitivity of IRT/IRT protocol in the cystic fibrosis newborn screening program: 6-year experience of three tertiary centers. Eur J Pediatr 2023; 182:1067-1076. [PMID: 36565324 DOI: 10.1007/s00431-022-04766-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 12/09/2022] [Accepted: 12/14/2022] [Indexed: 12/25/2022]
Abstract
We aimed to evaluate cutoff values of immunoreactive trypsinogen (IRT)/IRT and determine relationship between IRT values and clinical characteristics of children with cystic fibrosis (CF). This study is cross-sectional study. Data of children with positive newborn screening (NBS) between 2015 and 2021 were evaluated in three pediatric pulmonology centers. Age at admission, sex, gestational age, presence of history of meconium ileus, parental consanguinity, sibling with CF, and doll-like face appearance, first and second IRT values, sweat chloride test, fecal elastase, fecal fat, biochemistry results, and age at CF diagnosis were recorded. Sensitivity and specificity of IRT cutoff values were evaluated. Of 815 children with positive NBS, 58 (7.1%) children were diagnosed with CF. Median values of first and second IRT were 157.2 (103.7-247.6) and 113.0 (84.0-201.5) μg/L. IRT values used in current protocol, sensitivity was determined as 96.6%, specificity as 17.2% for first IRT, and 96.6% sensitivity, 20.5% specificity for second IRT. Positive predictive value (PPV) was determined as 7.1%. When cutoff value for first IRT was estimated as 116.7 μg/L, sensitivity was 69.0% and specificity was 69.6%, and when cutoff value was set to 88.7 μg/L for second IRT, sensitivity was 69.0% and specificity was 69.0%. Area under curve was 0.757 for first and 0.763 for second IRT (p < 0.001, p < 0.001, respectively). PPV was calculated as 4.3%. Conclusion: Although sensitivity of CF NBS is high in our country, its PPV is significantly lower than expected from CF NBS programs. False-positive NBS results could have been overcome by revising NBS strategy. What is Known: • Although immunoreactive trypsinogen elevation is a sensitive test used in cystic fibrosis newborn screening, its specificity is low. • In countries although different algorithms are used, all strategies begin with the measurement of immunoreactive trypsinogen in dried blood spots. What is New: • In our study, it was shown that use of the IRT/IRT protocol for cystic fibrosis newborn screening is not sufficient for the cut-off values determined by the high number of patients. • Newborn screening strategy should be reviewed to reduce false positive newborn screening results.
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Affiliation(s)
- Tugba Ramasli Gursoy
- Department of Pediatric Pulmonology, Faculty of Medicine, Gazi University, Ankara, Turkey
| | - Pelin Asfuroglu
- Department of Pediatric Pulmonology, Faculty of Medicine, Gazi University, Ankara, Turkey
| | | | - Ayse Tana Aslan
- Department of Pediatric Pulmonology, Faculty of Medicine, Gazi University, Ankara, Turkey.
| | - Asli Imran Yilmaz
- Department of Pediatric Pulmonology, Necmettin Erbakan University Meram Faculty of Medicine, Konya, Turkey
| | - Gokcen Unal
- Department of Pediatric Pulmonology, Necmettin Erbakan University Meram Faculty of Medicine, Konya, Turkey
| | - Büsra Sultan Kibar
- Department of Pediatrics, Necmettin Erbakan University Meram Faculty of Medicine, Konya, Turkey
| | - Sevgi Pekcan
- Department of Pediatric Pulmonology, Necmettin Erbakan University Meram Faculty of Medicine, Konya, Turkey
| | - Melih Hangul
- Department of Pediatric Pulmonology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Mehmet Kose
- Department of Pediatric Pulmonology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Isil Irem Budakoglu
- Department of Medical Education, Faculty of Medicine, Gazi University, Ankara, Turkey
| | - Deniz Acican
- Department of Child and Adolescent Health, Public Health, General Directorate, Ankara, Turkey
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de Azevedo LVF, Cruz FCRM, Martins JP, Marson FAL. Cystic Fibrosis: A Descriptive Analysis of Deaths in a Two-Decade Period in Brazil According to Age, Race, and Sex. Diagnostics (Basel) 2023; 13:diagnostics13040763. [PMID: 36832251 PMCID: PMC9954801 DOI: 10.3390/diagnostics13040763] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/24/2023] [Accepted: 02/15/2023] [Indexed: 02/19/2023] Open
Abstract
The diagnosis of cystic fibrosis has improved in the last few years due to greater access to diagnostic tools and the evolution of molecular biology; the knowledge obtained has contributed to the understanding of its death profile. In this context, an epidemiological study was developed focusing on deaths from cystic fibrosis in Brazil from 1996 to 2019. The data were collected from the Data-SUS (Unified National Health System Information Technology Department from Brazil). The epidemiological analysis included patients' age groups, racial groups, and sex. In our data, between 1996 and 2019, Σ3050 deaths were recorded, totaling a ≅330% increase in the number of deaths resulting from cystic fibrosis. This fact might be related to a better diagnosis of the disease, mainly in patients from racial groups that are not commonly associated with cystic fibrosis, such as Black individuals, Hispanic or Latino (mixed individuals/Pardos) individuals, and American Indians (Indigenous peoples from Brazil). Regarding of race, the Σ of deaths was: nine (0.3%) in the American Indian group, 12 (0.4%) in the Asian group, 99 (3.6%) in the Black or African American group, 787 (28.6%) in the Hispanic or Latino group, and 1843 (67.0%) in the White group. The White group showed the highest prevalence of deaths, and the increase in mortality was ≅150 times in this group, while, in the Hispanic or Latino group, it was ≅75 times. Regarding sex, the numbers and percentage of deaths of both male (N = 1492; 48.9%) and female (N = 1557; 51.1%) patients were seen to be relatively close. As for age groups, the >60-year-old group presented the most significant results, with an increase of ≅60 times in the registered deaths. In conclusion, in Brazil, despite the number of deaths from cystic fibrosis being prevalent in the White group, it increased in all racial groups (Hispanic or Latino, Black or African American, American Indian, or Asian individuals) and was associated with older age.
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Sontag MK, Miller JI, McKasson S, Gaviglio A, Martiniano SL, West R, Vazquez M, Ren CL, Farrell PM, McColley SA, Kellar-Guenther Y. Newborn Screening for Cystic Fibrosis: A Qualitative Study of Successes and Challenges from Universal Screening in the United States. Int J Neonatal Screen 2022; 8:ijns8030038. [PMID: 35892468 PMCID: PMC9326751 DOI: 10.3390/ijns8030038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 06/14/2022] [Accepted: 06/20/2022] [Indexed: 11/16/2022] Open
Abstract
Cystic fibrosis (CF) newborn screening (NBS) was universally adopted in 2009 in the United States. Variations in NBS practices between states may impact the timing of diagnosis and intervention. Quantitative metrics can provide insight into NBS programs (NBSP), but the nuances cannot be elucidated without additional feedback from programs. This study was designed to determine facilitators and barriers to timely diagnosis and intervention following NBS for CF. The median age at the first CF event for infants with CF within each state was used to define early and late states (n = 15 per group); multiple CF centers were invited in states with more than two CF centers. Thirty states were eligible, and 61 NBSP and CF centers were invited to participate in structured interviews to determine facilitators and barriers. Once saturation of themes was reached, no other interviews were conducted. Forty-five interviews were conducted (n = 16 early CF center, n = 12 late CF center, n = 11 early NBSP, and n = 6 late NBSP). Most interviewees reported good communication between CF centers and NBSP. Communication between primary care providers (PCPs) and families was identified as a challenge, leading to delays in referral and subsequent diagnosis. The misperception of low clinical risk in infants from racial and ethnic minority groups was a barrier to early diagnostic evaluation for all groups. NBSP and CF centers have strong relationships. Early diagnosis may be facilitated through more engagement with PCPs. Quality improvement initiatives should focus on continuing strong partnerships between CF centers and NBS programs, improving education, communication strategies, and partnerships with PCPs, and improving CF NBS timeliness and accuracy.
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Affiliation(s)
- Marci K. Sontag
- Center for Public Health Innovation at CI International, Littleton, CO 80120, USA; (J.I.M.); (S.M.); (R.W.); (Y.K.-G.)
- Colorado School of Public Health, University of Colorado Anschutz Medical Center, Aurora, CO 80045, USA
- Correspondence: ; Tel.: +1-303-867-1315
| | - Joshua I. Miller
- Center for Public Health Innovation at CI International, Littleton, CO 80120, USA; (J.I.M.); (S.M.); (R.W.); (Y.K.-G.)
| | - Sarah McKasson
- Center for Public Health Innovation at CI International, Littleton, CO 80120, USA; (J.I.M.); (S.M.); (R.W.); (Y.K.-G.)
| | - Amy Gaviglio
- Connetics Consulting, Minneapolis, MN 55417, USA;
| | - Stacey L. Martiniano
- Children’s Hospital Colorado, Aurora, CO 80045, USA;
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Rhonda West
- Center for Public Health Innovation at CI International, Littleton, CO 80120, USA; (J.I.M.); (S.M.); (R.W.); (Y.K.-G.)
| | - Marisol Vazquez
- Ann & Robert H. Lurie Children’s Hospital, Chicago, IL 60611, USA; (M.V.); (S.A.M.)
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Clement L. Ren
- Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA;
- Division of Pulmonary and Sleep Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Philip M. Farrell
- Departments of Pediatrics and Population Health Sciences, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA;
| | - Susanna A. McColley
- Ann & Robert H. Lurie Children’s Hospital, Chicago, IL 60611, USA; (M.V.); (S.A.M.)
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Yvonne Kellar-Guenther
- Center for Public Health Innovation at CI International, Littleton, CO 80120, USA; (J.I.M.); (S.M.); (R.W.); (Y.K.-G.)
- Colorado School of Public Health, University of Colorado Anschutz Medical Center, Aurora, CO 80045, USA
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Forgrave LM, Wang M, Yang D, DeMarco ML. Proteoforms and their expanding role in laboratory medicine. Pract Lab Med 2022; 28:e00260. [PMID: 34950758 PMCID: PMC8672040 DOI: 10.1016/j.plabm.2021.e00260] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 10/31/2021] [Accepted: 11/22/2021] [Indexed: 12/17/2022] Open
Abstract
The term “proteoforms” describes the range of different structures of a protein product of a single gene, including variations in amino acid sequence and post-translational modifications. This diversity in protein structure contributes to the biological complexity observed in living organisms. As the concentration of a particular proteoform may increase or decrease in abnormal physiological states, proteoforms have long been used in medicine as biomarkers of health and disease. Notably, the analytical approaches used to analyze proteoforms have evolved considerably over the years. While ligand binding methods continue to play a large role in proteoform measurement in the clinical laboratory, unanticipated or unknown post-translational modifications and sequence variants can upend even extensively tested and vetted assays that have successfully made it through the medical regulatory process. As an alternate approach, mass spectrometry—with its high molecular selectivity—has become an essential tool in detection, characterization, and quantification of proteoforms in biological fluids and tissues. This review explores the analytical techniques used for proteoform detection and quantification, with an emphasis on mass spectrometry and its various applications in clinical research and patient care including, revealing new biomarker targets, helping improve the design of contemporary ligand binding in vitro diagnostics, and as mass spectrometric laboratory developed tests used in routine patient care.
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Affiliation(s)
- Lauren M. Forgrave
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
| | - Meng Wang
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
| | - David Yang
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
| | - Mari L. DeMarco
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Providence Health Care, 1081 Burrard St, Vancouver, V6Z 1Y6, Canada
- Corresponding author. Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.
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Final results of the southwest German pilot study on cystic fibrosis newborn screening - Evaluation of an IRT/PAP protocol with IRT-dependent safety net: Results of the Southwest German CFNBS pilot study. J Cyst Fibros 2021; 21:422-433. [PMID: 34764021 DOI: 10.1016/j.jcf.2021.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 06/21/2021] [Accepted: 10/16/2021] [Indexed: 11/20/2022]
Abstract
BACKGROUND Previous studies suggest that PAP-based CF protocols are suitable for newborn screening (NBS) for cystic fibrosis (CF) when newborns designated as CFSPID should not be detected. However, there are still discussions about the performance of IRT/PAP algorithms. We present the final results of a pilot study evaluating a IRT/PAP protocol with an IRT-dependent safety net (SN) conducted from 2008 to 2016 in southwestern Germany on nearly 500,000 newborns. METHODS To achieve reliable data, all newborns were screened using both the PAP-based and a DNA-based CFNBS algorithm. PAP quantification and genetic analysis of the four most common CFTR mutations in Germany were performed in all newborns with IRT≥99.0 percentile. NBS was rated positive if either PAP was ≥1.6 µg/l and/or at least one CFTR mutation was detected. In addition, an IRT-dependent SN resulted in positive rating for both protocols if IRT was ≥99.9 percentile. To evaluate the IRT/PAP protocol, its performance was compared to that of the IRT/DNA protocol. RESULTS The IRT/PAP protocol with IRT-based SN used in the study achieved a sensitivity of 94%, if false-negative detected neonates with meconium ileus and those designated as CFSPID were excluded from analysis. CF/CFSPID ratio was 92. However, PPV of the IRT/PAP+SN protocol was with 10.3% very low. CONCLUSIONS PAP-based CFNBS protocols can be used, if less detection of CFSPID is desired. The IRT/PAP protocol with IRT-dependent SN evaluated here achieved adequate sensitivity but should probably be used in combination with a third-tier test to also achieve an acceptable PPV.
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Butterfield RJ, Imburgia C, Mayne K, Newcomb T, Dunn DM, Duval B, Feldkamp ML, Johnson NE, Weiss RB. High throughput screening for expanded CTG repeats in myotonic dystrophy type 1 using melt curve analysis. Mol Genet Genomic Med 2021; 9:e1619. [PMID: 33624941 PMCID: PMC8123750 DOI: 10.1002/mgg3.1619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/23/2020] [Accepted: 01/29/2021] [Indexed: 12/24/2022] Open
Abstract
Background Myotonic dystrophy type 1 (DM1) is caused by CTG repeat expansions in the DMPK gene and is the most common form of muscular dystrophy. Patients can have long delays from onset to diagnosis, since clinical signs and symptoms are often nonspecific and overlapping with other disorders. Clinical genetic testing by Southern blot or triplet‐primed PCR (TP‐PCR) is technically challenging and cost prohibitive for population surveys. Methods Here, we present a high throughput, low‐cost screening tool for CTG repeat expansions using TP‐PCR followed by high resolution melt curve analysis with saturating concentrations of SYBR GreenER dye. Results We determined that multimodal melt profiles from the TP‐PCR assay are a proxy for amplicon length stoichiometry. In a screen of 10,097 newborn blood spots, melt profile analysis accurately reflected the tri‐modal distribution of common alleles from 5 to 35 CTG repeats, and identified the premutation and full expansion alleles. Conclusion We demonstrate that robust detection of expanded CTG repeats in a single tube can be achieved from samples derived from specimens with minimal template DNA such as dried blood spots (DBS). This technique is readily adaptable to large‐scale testing programs such as population studies and newborn screening programs.
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Affiliation(s)
- Russell J Butterfield
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA.,Department of Neurology, University of Utah, Salt Lake City, Utah, USA
| | - Carina Imburgia
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA
| | - Katie Mayne
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA
| | - Tara Newcomb
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA
| | - Diane M Dunn
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, USA
| | - Brett Duval
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, USA
| | - Marcia L Feldkamp
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA
| | - Nicholas E Johnson
- Department of Neurology, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Robert B Weiss
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, USA
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Coverstone AM, Ferkol TW. Early Diagnosis and Intervention in Cystic Fibrosis: Imagining the Unimaginable. Front Pediatr 2021; 8:608821. [PMID: 33505947 PMCID: PMC7830672 DOI: 10.3389/fped.2020.608821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/10/2020] [Indexed: 11/13/2022] Open
Abstract
Cystic fibrosis is the most common life-shortening genetic disease affecting Caucasians, clinically manifested by fat malabsorption, poor growth and nutrition, and recurrent sinopulmonary infections. Newborn screening programs for cystic fibrosis are now implemented throughout the United States and in many nations worldwide. Early diagnosis and interventions have led to improved clinical outcomes for people with cystic fibrosis. Newer cystic fibrosis transmembrane conductance regulator potentiators and correctors with mutation-specific effects have increasingly been used in children, and these agents are revolutionizing care. Indeed, it is possible that highly effective modulator therapy used early in life could profoundly affect the trajectory of cystic fibrosis lung disease, and primary prevention may be achievable.
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Affiliation(s)
- Andrea M. Coverstone
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, United States
| | - Thomas W. Ferkol
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, United States
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO, United States
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12
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Maciel LMZ, Magalhães PKR, Ciampo IRLD, Sousa MLBD, Fernandes MIM, Sawamura R, Bittar RR, Molfetta GAD, Silva Júnior WAD. The first five-year evaluation of cystic fibrosis neonatal screening program in São Paulo State, Brazil. CAD SAUDE PUBLICA 2020; 36:e00049719. [PMID: 33111836 DOI: 10.1590/0102-311x00049719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 03/20/2020] [Indexed: 11/21/2022] Open
Abstract
The Hospital of the Ribeirão Preto Medical School, University of São Paulo is one of the three screening centers in São Paulo State, Brazil, and has included a test for cystic fibrosis (CF) since February 6, 2010, by a court order. We evaluated the first five years of this CF-newborn screening program. The original immunoreactive trypsinogen (IRT)/IRT screening protocol was adopted in Brazil. A total of 173,571 newborns were screened, 1,922 (1.1%) of whom showed IRT1 ≥ 70ng/mL. Of these, 1,795 (93.4%) collected IRT2, with elevated results (IRT2 ≥ 70ng/mL) in 102 of them (5.2%). We identified a total of 26 CF cases during this period, including three CF cases that were not detected by the CF-newborn screening. The incidence of the disease among the screened babies was 1:6,675 newborns screened. Median age at the initial evaluation was 42 days, comparable to that of neonates screened with the IRT/DNA protocol. Almost all infants with CF already exhibited some manifestations of the disease during the neonatal period. The mutation most frequently detected in the CF cases was F508del. These findings suggest the early age at the beginning of treatment at our center was due to the effort of the persons involved in the program regarding an effective active search. Considering the false negative results of CF-newborn screening and the early onset of clinical manifestations of the disease in this study, pediatricians should be aware of the diagnosis of CF even in children with negative test.
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Affiliation(s)
| | | | | | | | | | - Regina Sawamura
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
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Castells EM, Sánchez A, Frómeta A, Mokdse Y, Ozunas N, Licourt T, Arteaga AL, Silva E, Collazo T, Rodríguez F, Martín O, Espinosa M, Del Río L, Pérez PL, Morejón G, Almira C, Núñez Z, Melchor A, González EC. Pilot study for cystic fibrosis neonatal screening: the Cuban experience. Clin Chem Lab Med 2020; 58:1857-1864. [PMID: 32352395 DOI: 10.1515/cclm-2020-0037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 03/28/2020] [Indexed: 11/15/2022]
Abstract
Background In Cuba, no screening program for cystic fibrosis (CF) has been implemented yet. The ultramicro enzyme-linked immunosorbent assay (UMELISA)® TIR NEONATAL has been developed for the measurement of immunoreactive trypsin (IRT) in dried blood spots on filter paper. The analytical performance of the kit was evaluated in the national network of laboratories. Methods Newborn dried blood samples (DBS) were evaluated in 16 laboratories. An IRT/IRT/DNA protocol was followed using a cut-off value of 50 ng/mL. The mean, median and percentiles of the distribution were calculated and a two-sample t-test with unequal variance was used for statistical analysis. Influence of perinatal factors on IRT levels was analyzed. Results From January to June 2018, 6470 newborns were studied, obtaining a mean IRT value of 12.09 ng/mL (ranging 0-358 ng/mL) and a median of 8.99 ng/mL. Fifty-two samples (0.78%) were above the cut-off level and 16 samples (0.24%) were elevated in the re-screening process. One of them was confirmed positive by molecular biology (phe508del/c.3120 + 1G > A), constituting the first newborn screened and diagnosed early in Cuba. Second DBS samples were collected on average at 14 days and processed in the laboratory at 16 days of birth. Significant differences were observed (p < 0.05) when evaluating the influence of gender, birth weight (BW) and gestational age (GA) on the IRT values. Lower IRT concentrations were found in samples processed after 10 days of collection. Conclusions The performance of UMELISA® TIR NEONATAL in the laboratories has been satisfactory; hence CF newborn screening (NBS) was extended throughout the country from January 2019.
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Affiliation(s)
- Elisa M Castells
- Department of Neonatal Screening, Immunoassay Center, 134th Street and 25th Avenue, Postal Code 6653, Cubanacán, Playa, Havana City, Cuba
| | | | | | | | | | | | | | | | - Teresa Collazo
- National Center of Medical Genetics, Playa, Havana, Cuba
| | - Fidel Rodríguez
- Hospital Universitario "General Calixto García", Plaza, Havana, Cuba
| | | | | | | | | | | | | | - Zoe Núñez
- Immunoassay Center, Havana City, Cuba
| | - Antonio Melchor
- Reseach Director, Immunoassay Center, Cubanacán, Playa, Havana, Cuba
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Souza EL, Ribeiro Mota L, Leite Ferreira de Lima RL, Horejs Bittencourt P, Castro Ribeiro Guedes VM, Salinas D. K162E - A rare and uncategorized CFTR variant causing cystic fibrosis. J Cyst Fibros 2020; 20:489-491. [PMID: 32674983 DOI: 10.1016/j.jcf.2020.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 07/08/2020] [Accepted: 07/08/2020] [Indexed: 11/19/2022]
Affiliation(s)
- Edna Lúcia Souza
- Department of Pediatrics, School of Medicine of Bahia, Federal University of Bahia, Salvador, Brazil; Post-Graduation Program in Interactive Processes of Systems and Organs, Institute of Health Sciences, Federal University of Bahia, Salvador, Brazil; Post-Graduation in Medicine and Health, Federal University of Bahia, Salvador, Brazil; University Hospital Professor Edgard, Federal University of Bahia, Salvador, Brazil.
| | - Laís Ribeiro Mota
- Post-Graduation Program in Interactive Processes of Systems and Organs, Institute of Health Sciences, Federal University of Bahia, Salvador, Brazil
| | | | | | | | - Danieli Salinas
- Division of Pediatric Pulmonology, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
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Sinclair G, McMahon V, Schellenberg A, Nelson TN, Chilvers M, Vallance H. Performance of a Three-Tier (IRT-DNA-IRT) Cystic Fibrosis Screening Algorithm in British Columbia. Int J Neonatal Screen 2020; 6:46. [PMID: 33073036 PMCID: PMC7423010 DOI: 10.3390/ijns6020046] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 05/27/2020] [Indexed: 11/17/2022] Open
Abstract
Newborn screening for Cystic Fibrosis has been implemented in most programs worldwide, but the approach used varies, including combinations of immunoreactive trypsinogen (IRT) and CFTR mutation analysis on one or more specimens. The British Columbia (BC) newborn screening program tests ~45,000 infants per year in BC and the Yukon Territory, covering almost 1.5 million km2 in western Canada. CF screening was initiated using an IRT-DNA-IRT approach with a second bloodspot card at 21 days of age for all CFTR mutation heterozygotes and any non-carriers in the top 0.1% for IRT. This second IRT was implemented to avoid sweat testing of infants without persistent hypertrypsinemia, reducing the burden of travel for families. Over nine years (2010-2018), 401,977 infants were screened and CF was confirmed in 76, and a further 28 were deemed CF screen positive inconclusive diagnosis (CFSPID). Day 21 IRT was normal in 880 CFTR mutation carriers who were quoted a very low CF risk and offered optional sweat testing. Only 13% of families opted for sweat testing and a total of 1036 sweat tests were avoided. There were six false negative CF cases (and three CFSPID) due to a low initial IRT or no CFTR mutations. Although one CFSPID case had a normal repeat IRT result, the addition of the day 21 IRT did not contribute to any CF false negatives.
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Affiliation(s)
- Graham Sinclair
- Department of Pathology and Laboratory Medicine, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3N1, Canada; (T.N.N.); (H.V.)
| | - Vanessa McMahon
- Department of Pediatrics, BC Children's Hospital, Vancouver, BC V6H 3N1, Canada; (V.M.); (A.S.)
| | - Amy Schellenberg
- Department of Pediatrics, BC Children's Hospital, Vancouver, BC V6H 3N1, Canada; (V.M.); (A.S.)
| | - Tanya N Nelson
- Department of Pathology and Laboratory Medicine, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3N1, Canada; (T.N.N.); (H.V.)
| | - Mark Chilvers
- Department of Pediatrics, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3N1, Canada;
| | - Hilary Vallance
- Department of Pathology and Laboratory Medicine, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3N1, Canada; (T.N.N.); (H.V.)
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Sommerburg O, Hammermann J. Pancreatitis-Associated Protein in Neonatal Screening for Cystic Fibrosis: Strengths and Weaknesses. Int J Neonatal Screen 2020; 6:28. [PMID: 33073025 PMCID: PMC7422993 DOI: 10.3390/ijns6020028] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 03/13/2020] [Indexed: 11/16/2022] Open
Abstract
There are currently four countries and one local region in Europe that use PAP in their newborn screening programme. The first country to employ PAP at a national level was the Netherlands, which started using IRT/PAP/DNA/EGA in 2011. Germany followed in 2016 with a slightly different IRT/PAP/DNA strategy. Portugal also started in 2016, but with an IRT/PAP/IRT programme, and in 2017, Austria changed its IRT/IRT protocol to an IRT/PAP/IRT program. In 2018, Catalonia started to use an IRT/PAP/IRT/DNA strategy. The strengths of PAP are the avoidance of carrier detection and a lower detection rate of CFSPID. PAP seems to have advantages in detecting CF in ethnically-diverse populations, as it is a biochemical approach to screening, which looks for pancreatic injury. Compared to an IRT/IRT protocol, an IRT/PAP protocol leads to earlier diagnoses. While PAP can be assessed with the same screening card as the first IRT, the second IRT in an IRT/IRT protocol requires a second heel prick around the 21st day of the patient's life. However, IRT/PAP has two main weaknesses. First, an IRT/PAP protocol seems to have a lower sensitivity compared to a well-functioning IRT/DNA protocol, and second, IRT/PAP that is performed as a purely biochemical protocol has a very low positive predictive value. However, if the advantages of PAP are to be exploited, a combination of IRT/PAP with genetic screening or a second IRT as a third tier could be an alternative for a sufficiently performing CF-NBS protocol.
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Affiliation(s)
- Olaf Sommerburg
- Division of Pediatric Pulmonology & Allergy and Cystic Fibrosis Center, Department of Pediatrics III, University of Heidelberg, Im Neuenheimer Feld 430, D-69120 Heidelberg, Germany
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), Im Neuenheimer Feld 350, D-69120 Heidelberg, Germany
| | - Jutta Hammermann
- Pediatric Department, University Hospital of Dresden, Fetscherstr. 74, D-01307 Dresden, Germany;
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Özdemir A, Doğruel D. Newborn Screening for Cystic Fibrosis in Mersin Province: Yearly Assessment of the National Program. Turk Thorac J 2020; 21:100-104. [PMID: 32202999 DOI: 10.5152/turkthoracj.2019.18187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 03/05/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVES A national newborn screening program for cystic fibrosis (CF) was started using immunoreactive trypsinogen (IRT) test on January 1, 2015, in Turkey. We aimed to analyze the characteristics of newborn screen-positive (NBSP) infants in Mersin province. MATERIALS AND METHODS The data on NBSP infants were retrospectively analyzed between 2015 and 2017 from records of Mersin Women & Children's Hospital and Mersin City Training and Research Hospital. RESULTS A total of 82,273 newborns were screened for CF by IRT test between January 2015 and December 2017 in Mersin. Among those, 512 infants were defined as NBSP after two repeated IRT tests (IRT/IRT) (138 infants in 2015, 217 in 2016, and 157 in 2017). Sweat test was normal in the majority of infants (115 infants [83.3%] in 2015, 189 [87.1%] in 2016, and 129 [82.2%] in 2017). Overall, between 2015 and 2017, after two repeated sweat tests, 4 infants had sweat test results in the intermediate range and 9 infants had positive sweat tests. The incidence of CF for a 3-year period was approximately 1/9300 in our region. The positive predictive value of IRT test for defining CF was 1.8%, with a sensitivity of 90.0% and specificity of 99.4%. CONCLUSION IRT/IRT test as a newborn screening strategy provides the opportunity for earlier diagnosis and treatment of CF patients. More data are needed to understand the frequency of CF on a national level.
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Affiliation(s)
- Ali Özdemir
- Pediatric Pulmonary Section, Department of Pediatrics, Mersin City Training and Research Hospital, Mersin, Turkey
| | - Dilek Doğruel
- Pediatric Allergy Section, Department of Pediatrics, Çukurova University School of Medicine, Adana, Turkey
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18
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Bergougnoux A, Lopez M, Girodon E. The Role of Extended CFTR Gene Sequencing in Newborn Screening for Cystic Fibrosis. Int J Neonatal Screen 2020; 6:23. [PMID: 33073020 PMCID: PMC7422980 DOI: 10.3390/ijns6010023] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 03/19/2020] [Indexed: 01/25/2023] Open
Abstract
There has been considerable progress in the implementation of newborn screening (NBS) programs for cystic fibrosis (CF), with DNA analysis being part of an increasing number of strategies. Thanks to advances in genomic sequencing technologies, CFTR-extended genetic analysis (EGA) by sequencing its coding regions has become affordable and has already been included as part of a limited number of core NBS programs, to the benefit of admixed populations. Based on results analysis of existing programs, the values and challenges of EGA are reviewed in the perspective of its implementation on a larger scale. Sensitivity would be increased at best by using EGA as a second tier, but this could be at the expense of positive predictive value, which improves, however, if EGA is applied after testing a variant panel. The increased detection of babies with an inconclusive diagnosis has proved to be a major drawback in programs using EGA. The lack of knowledge on pathogenicity and penetrance associated with numerous variants hinders the introduction of EGA as a second tier, but EGA with filtering for all known CF variants with full penetrance could be a solution. The issue of incomplete knowledge is a real challenge in terms of the implemention of NBS extended to many genetic diseases.
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Affiliation(s)
- Anne Bergougnoux
- Molecular Genetics Laboratory, CHU Montpellier, EA7402 University of Montpellier, 34093 Montpellier CEDEX 5, France;
| | - Maureen Lopez
- Molecular Genetics Laboratory, Cochin Hospital, APHP. Centre, University of Paris, 75014 Paris, France;
| | - Emmanuelle Girodon
- Molecular Genetics Laboratory, Cochin Hospital, APHP. Centre, University of Paris, 75014 Paris, France;
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Diagnosis of Cystic Fibrosis. Respir Med 2020. [DOI: 10.1007/978-3-030-42382-7_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Sadik I, Pérez de Algaba I, Jiménez R, Benito C, Blasco-Alonso J, Caro P, Navas-López VM, Pérez-Frías J, Pérez E, Serrano J, Yahyaoui R. Initial Evaluation of Prospective and Parallel Assessments of Cystic Fibrosis Newborn Screening Protocols in Eastern Andalusia: IRT/IRT versus IRT/PAP/IRT. Int J Neonatal Screen 2019; 5:32. [PMID: 33072991 PMCID: PMC7510193 DOI: 10.3390/ijns5030032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 09/01/2019] [Indexed: 11/16/2022] Open
Abstract
Identifying newborns at risk for cystic fibrosis (CF) by newborn screening (NBS) using dried blood spot (DBS) specimens provides an opportunity for presymptomatic detection. All NBS strategies for CF begin with measuring immunoreactive trypsinogen (IRT). Pancreatitis-associated protein (PAP) has been suggested as second-tier testing. The main objective of this study was to evaluate the analytical performance of an IRT/PAP/IRT strategy versus the current IRT/IRT strategy over a two-year pilot study including 68,502 newborns. The design of the study, carried out in a prospective and parallel manner, allowed us to compare four different CF-NBS protocols after performing a post hoc analysis. The best PAP cutoff point and the potential sources of PAP false positive results in our non-CF newborn population were also studied. 14 CF newborns were detected, resulting in an overall CF prevalence of 1/4, 893 newborns. The IRT/IRT algorithm detected all CF cases, but the IRT/PAP/IRT algorithm failed to detect one case of CF. The IRT/PAP/IRT with an IRT-dependent safety net protocol was a good alternative to improve sensitivity to 100%. The IRT × PAP/IRT strategy clearly performed better, with a sensitivity of 100% and a positive predictive value (PPV) of 39%. Our calculated optimal cutoffs were 2.31 µg/L for PAP and 167.4 µg2/L2 for IRT × PAP. PAP levels were higher in females and newborns with low birth weight. PAP false positive results were found mainly in newborns with conditions such as prematurity, sepsis, and hypoxic-ischemic encephalopathy.
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Affiliation(s)
- Ilham Sadik
- Clinical Laboratory, Hospital La Línea de la Concepción, 11300 Cádiz, Spain
| | - Inmaculada Pérez de Algaba
- Laboratory of Metabolic Disorders and Newborn Screening Center of Eastern Andalusia, Málaga Regional University Hospital, Avenida Arroyo de los Angeles s/n, 29011 Málaga, Spain
| | - Rocío Jiménez
- Laboratory of Metabolic Disorders and Newborn Screening Center of Eastern Andalusia, Málaga Regional University Hospital, Avenida Arroyo de los Angeles s/n, 29011 Málaga, Spain
| | - Carmen Benito
- Department of Genetics, Málaga Regional University Hospital, 29011 Málaga, Spain
| | - Javier Blasco-Alonso
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
| | - Pilar Caro
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
- Department of Pharmacology and Pediatrics, University of Málaga, 29071 Málaga, Spain
| | - Víctor M. Navas-López
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
| | - Javier Pérez-Frías
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
- Department of Pharmacology and Pediatrics, University of Málaga, 29071 Málaga, Spain
| | - Estela Pérez
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
- Department of Pharmacology and Pediatrics, University of Málaga, 29071 Málaga, Spain
| | - Juliana Serrano
- Department of Pediatrics, Málaga Regional University Hospital, 29011 Málaga, Spain
| | - Raquel Yahyaoui
- Laboratory of Metabolic Disorders and Newborn Screening Center of Eastern Andalusia, Málaga Regional University Hospital, Avenida Arroyo de los Angeles s/n, 29011 Málaga, Spain
- Institute of Biomedical Research in Málaga-IBIMA, 29010 Málaga, Spain
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Brockow I, Nennstiel U. Parents' experience with positive newborn screening results for cystic fibrosis. Eur J Pediatr 2019; 178:803-809. [PMID: 30852643 DOI: 10.1007/s00431-019-03343-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 01/29/2019] [Accepted: 02/07/2019] [Indexed: 11/26/2022]
Abstract
In Germany, screening for cystic fibrosis (CF) is part of the newborn screening since September 2016. The risk of psychological harm due to false-positive screening results is a longstanding concern. We investigated the parents' perception of the CF screening process in Bavaria and the communication after positive screening results with a questionnaire. Until August 2018, 192 children went through a final diagnostic testing after a positive CF screening result, and 105 (54.7%) families completed the questionnaire. Of these, only 30 parents obtained information about the newborn screening by a physician, despite this being mandatory in Germany. Parents being informed by a CF specialist (28.6%) about the positive screening result were more satisfied with the given information (80.0 versus 50% informed by the maternity ward), and the delay until the final diagnostic testing was shorter. More than 3 days between the information about the screening result and the diagnostic testing was too long for 77.7% of the families.Conclusion: Performing final diagnostic testing with only short delays and receiving satisfactory information is important. Therefore, parents should be informed directly by a CF center about positive screening results and only when sweat testing is possible within the next days. What is Known: • The risk of psychological harm due to false-positive screening results is a longstanding concern. • Satisfactory information about the positive CF screening result seem to reduce the parental stress. What is New: • Parents being informed directly by a CF specialist were more satisfied with the given information and the delay until the final diagnostic testing was shorter. • Our data support the concept that parents should better be informed directly by a CF specialist about positive screening results and only when sweat testing is possible within the next days to reduce parental stress.
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Affiliation(s)
- Inken Brockow
- Screening Center, Bavarian Health and Food Safety Authority (LGL), Veterinaerstrasse 2, 85764, Oberschleissheim, Germany.
| | - Uta Nennstiel
- Screening Center, Bavarian Health and Food Safety Authority (LGL), Veterinaerstrasse 2, 85764, Oberschleissheim, Germany
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Cystic fibrosis screen positive inconclusive diagnosis (CFSPID): Experience in Tuscany, Italy. J Cyst Fibros 2019; 18:484-490. [PMID: 31005549 DOI: 10.1016/j.jcf.2019.04.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 04/01/2019] [Accepted: 04/01/2019] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The implementation of cystic fibrosis (CF) newborn screening (NBS) has led to identification of infants with a positive NBS test but inconclusive diagnosis classified as "CF screen positive, inconclusive diagnosis" (CFSPID). We retrospectively evaluated the prevalence and clinical outcome of CFSPID infants diagnosed by 2 NBS algorithms in the period from 2011 to 2016 in the Tuscany region of Italy. METHODS In 2011-2016, we assessed the diagnostic impact of DNA analysis on the NBS 4-tier algorithm [immunoreactive trypsin (IRT) - meconium lactase - IRT2 - sweat chloride (SC)]. All CFSPID patients repeated SC testing every 6 months, and CFTR gene analysis was performed (detection rate 98%). We reclassified children as: CF diagnosis in presence of at least 2 pathological SC results; healthy carrier or healthy in presence of at least 2 normal SC results for age and either 1 or 0 CF-causing mutations, respectively. RESULTS We identified 32 CF and 50 CFSPID cases: 20/50 (40%) were diagnosed only by the IRT-DNA-SC algorithm and 16/50 (32%) only by IRT-meconium lactase-IRT2-SC. Both protocols identified the remaining 14 cases (28%). Thirty-seven of 50 (74%) CFSPID patients had a conclusive diagnosis on December 31, 2017:5 (10%) CF, 17 (34%) healthy and 15 (30%) healthy carriers; 13/50 (26%) cases were asymptomatic with persistent intermediate SC and followed as CFSPID (CF:CFSPID ratio 2.85:1). CONCLUSIONS In 6 years, the CF:CFSPID ratio modified from 0.64:1 to 2.85:1, and 10% of CFSPID cases progressed to CF. Genetic analysis improved positive predictive value and identified a higher number of CFSPID infants progressing to CF.
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23
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DiBattista A, McIntosh N, Lamoureux M, Al-Dirbashi OY, Chakraborty P, Britz-McKibbin P. Metabolic Signatures of Cystic Fibrosis Identified in Dried Blood Spots For Newborn Screening Without Carrier Identification. J Proteome Res 2019; 18:841-854. [PMID: 30507207 DOI: 10.1021/acs.jproteome.8b00351] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cystic fibrosis (CF) is a complex multiorgan disorder that is among the most common fatal genetic diseases benefiting from therapeutic interventions early in life. Newborn screening (NBS) for presymptomatic detection of CF currently relies on a two-stage immunoreactive trypsinogen (IRT) and cystic fibrosis transmembrane conductance regulator (CFTR) mutation panel algorithm that is sensitive but not specific for identifying affected neonates with a low positive predictive value. For the first time, we report the discovery of a panel of CF-specific metabolites from a single 3.2 mm diameter dried blood spot (DBS) punch when using multisegment injection-capillary electrophoresis-mass spectrometry (MS) as a high-throughput platform for nontargeted metabolite profiling from volume-restricted/biobanked specimens with quality control. This retrospective case-control study design identified 32 metabolites, including a series of N-glycated amino acids, oxidized glutathione disulfide, and nicotinamide that were differentially expressed in normal birth weight CF neonates without meconium ileus ( n = 36) as compared to gestational age/sex-matched screen-negative controls ( n = 44) after a false discovery rate adjustment ( q < 0.05). Also, 16 metabolites from DBS extracts allowed for discrimination of true CF cases from presumptive screen-positive carriers with one identified CFTR mutation and transient neonatal hypertrypsinogenemic neonates ( n = 72), who were later confirmed as unaffected due to a low sweat chloride (<29 mM) test result. Importantly, six CF-specific biomarker candidates satisfying a Bonferroni adjustment ( p < 7.25 × 10-5) from three independent batches of DBS specimens included several amino acids depleted in circulation (Tyr, Ser, Thr, Pro, Gly) likely reflecting protein maldigestion/malabsorption. Additionally, CF neonates had lower ophthalmic acid as an indicator of oxidative stress due to impaired glutathione efflux from exocrine/epithelial tissue and elevation of an unknown trivalent peptide that was directly correlated with IRT (ρ = 0.332, p = 4.55 × 10-4). Structural elucidation of unknown metabolites was performed by high-resolution MS/MS, whereas biomarker validation was realized when comparing a subset of metabolites from matching neonatal DBS specimens independently analyzed by direct infusion-MS/MS at an accredited NBS facility. This work sheds new light into the metabolic phenotype of CF early in life, which is required for better functional understanding of CFTR mutations of unknown clinical consequence and the development of more accurate yet cost-effective strategies for CF screening.
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Affiliation(s)
- Alicia DiBattista
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton L8S 4M1 , Canada
| | | | | | - Osama Y Al-Dirbashi
- College of Medicine and Health Sciences , United Arab Emirates University , Al Ain 15551 , United Arab Emirates
| | | | - Philip Britz-McKibbin
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton L8S 4M1 , Canada
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24
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Newborn blood spot screening for cystic fibrosis with a four-step screening strategy in the Netherlands. J Cyst Fibros 2019; 18:54-63. [DOI: 10.1016/j.jcf.2018.07.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 07/09/2018] [Accepted: 07/16/2018] [Indexed: 12/27/2022]
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25
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Foil KE, Powers A, Raraigh KS, Wallis K, Southern KW, Salinas D. The increasing challenge of genetic counseling for cystic fibrosis. J Cyst Fibros 2018; 18:167-174. [PMID: 30527892 DOI: 10.1016/j.jcf.2018.11.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/30/2018] [Accepted: 11/26/2018] [Indexed: 12/12/2022]
Abstract
Genetic counseling for cystic fibrosis (CF) is challenged by intricate molecular mechanisms, complex phenotypes, and psychosocial needs. CFTR variant interpretation has become critical; this manuscript examines variant nomenclature and classes, as well as opportunities and challenges posed by genetic technologies and genotype-directed therapies. With post-graduate training in medical genetics and counseling, genetic counselors educate patients and families, facilitate testing and interpretation, and help integrate genetic information into diagnosis and treatment. They support families, ranging from carrier couples or new parents, to children understanding their disease, to adults with CF contemplating reproduction. The changing face of CF increasingly highlights the critical importance of genetic information to patients and their families. Genetic counselors are uniquely poised to translate this information in diagnostics and personalized care. Genetic counselors straddle molecular and clinical realms, helping patients adapt, plan, and gain access to appropriate therapies.
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Affiliation(s)
- Kimberly E Foil
- Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Medical University of South Carolina, Charleston, SC, 29425, United States.
| | - Amy Powers
- Division of Pediatric Pulmonary and Sleep Medicine, University of Minnesota Health, Minneapolis, MN, 55455, United States.
| | - Karen S Raraigh
- Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD 21287, United States.
| | - Kimberly Wallis
- Center for Human Genetics, University Hospitals Cleveland Medical Center, Cleveland, OH 44106, Kimberly, United States.
| | - Kevin W Southern
- Department of Women's and Children's Health, Alder Hey Children's Hospital, University of Liverpool, Liverpool, England L12 2AP, United Kingdom.
| | - Danieli Salinas
- Children's Hospital Los Angeles, Pediatric Pulmonology Division, Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, United States.
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26
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Case Study: Cystic Fibrosis in the Newborn. Neonatal Netw 2018; 37:164-168. [PMID: 29789057 DOI: 10.1891/0730-0832.37.3.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Cystic fibrosis (CF) is considered one of the most commonly occurring fatal genetic disorders. This disorder is associated with pancreatic insufficiency and pulmonary complications. However, at birth the initial complications are associated with bowel obstruction. Cystic fibrosis management warrants an interdisciplinary team because this disorder affects various organ systems. Effective management of the newborn with CF assists in improving the child's overall prognosis. Family support is critical throughout the prenatal and postnatal periods. The case presented reviews a child born with suspected CF and the clinical course within the NICU.
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27
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Wiencek JR, Lo SF. Advances in the Diagnosis and Management of Cystic Fibrosis in the Genomic Era. Clin Chem 2018; 64:898-908. [DOI: 10.1373/clinchem.2017.274670] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 01/17/2018] [Indexed: 01/08/2023]
Abstract
Abstract
BACKGROUND
Cystic fibrosis (CF) is a complex autosomal recessive disease that continues to present unique diagnostic challenges. Because CF was first described in 1938, there has been a substantial growth of genetic and phenotypic information about the disorder. During the past few years, as more evidence has become available, a consortium of international experts determined that the 2008 guidelines from the CF Foundation needed to be reviewed and updated.
CONTENT
The goal of this review is to highlight the latest advances in CF multidisciplinary care, together with the recent updates to the 2017 CF Foundation diagnostic guidelines.
SUMMARY
Data from newborn screening programs, patient registries, clinical databases, and functional research have led to a better understanding of the CF transmembrane conductance regulator (CFTR) gene. Recent consensus guidelines have provided recommendations for clinicians and laboratorians to better assist with interpretation of disease status and related CF mutations. The highly recommended Clinical and Functional Translation of CFTR project should be the first resource in the evaluation of disease severity for CF mutations. Screen-positive newborns and patients with high clinical suspicion for CF are always recommended to undergo confirmatory sweat chloride testing with interpretations based on updated reference intervals. Every patient diagnosed with CF should receive genotyping, as novel molecular therapies are becoming standard of practice. The future of CF management must consider healthcare system disparities as CF transitions from a historically childhood disease to a predominantly adult epidemic.
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Affiliation(s)
- Joesph R Wiencek
- Division of Laboratory Medicine, Department of Pathology, University of Virginia School of Medicine and Health System, Charlottesville, VA
| | - Stanley F Lo
- Department of Pathology, Medical College of Wisconsin and Department of Pathology and Laboratory Medicine, Children's Hospital of Wisconsin, Milwaukee, WI
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28
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Ibarra-González I, Campos-Garcia FJ, Herrera-Pérez LDA, Martínez-Cruz P, Moreno-Graciano CM, Contreras-Capetillo SN, León-Burgos V, Maldonado-Solis FA, Alcántara-Ortigoza MA, González del Angel A, Vela-Amieva M. Newborn cystic fibrosis screening in southeastern Mexico: Birth prevalence and novel CFTR gene variants. J Med Screen 2017; 25:119-125. [DOI: 10.1177/0969141317722808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Objective To use the results of the first five years of a cystic fibrosis newborn screening program to estimate the cystic fibrosis birth prevalence and spectrum of cystic fibrosis transmembrane conductance regulator ( CFTR) gene variants in Yucatan, Mexico. Methods Screening was performed from 2010 to 2015, using two-tier immunoreactive trypsinogen testing, followed by a sweat test. When sweat test values were >30 mmol/L, the CFTR gene was analyzed. Results Of 96,071 newborns screened, a second sample was requested in 119 cases. A sweat test was performed in 30 newborns, and 9 possible cases were detected (seven confirmed cystic fibrosis and two inconclusive). The most frequently detected CFTR pathogenic variant (5/14 cystic fibrosis alleles, 35.7%) was p.(Phe508del); novel p.(Ala559Pro) and p.(Thr1299Hisfs*29) pathogenic variants were found. Conclusions Cystic fibrosis birth prevalence in southeastern Mexico is 1:13,724 newborns. Immunoreactive trypsinogen blood concentration is influenced by gestational age and by the time of sampling. The spectrum of CFTR gene variants in Yucatan is heterogeneous.
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Affiliation(s)
- Isabel Ibarra-González
- Sociedad Mexicana de Errores Innatos y Tamiz, A.C., México
- Instituto de Investigaciones Biomédicas, UNAM, CDMX, México
| | | | | | | | | | | | | | | | - Miguel Angel Alcántara-Ortigoza
- DNA-GEN, S.C. Centro de Alta Especialidad en Genética Humana, Ciudad de México, México
- Laboratorio de Biología Molecular, Departamento de Genética Humana, Instituto Nacional de Pediatría, CDMX, México
| | - Ariadna González del Angel
- DNA-GEN, S.C. Centro de Alta Especialidad en Genética Humana, Ciudad de México, México
- Laboratorio de Biología Molecular, Departamento de Genética Humana, Instituto Nacional de Pediatría, CDMX, México
| | - Marcela Vela-Amieva
- Sociedad Mexicana de Errores Innatos y Tamiz, A.C., México
- Laboratorio de Errores Innatos del Metabolismo y Tamiz, Instituto Nacional de Pediatría, CDMX, México
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29
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Savant AP, McColley SA. Cystic fibrosis year in review 2016. Pediatr Pulmonol 2017; 52:1092-1102. [PMID: 28608632 DOI: 10.1002/ppul.23747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/15/2017] [Indexed: 12/26/2022]
Abstract
In this article, we highlight cystic fibrosis (CF) research and case reports published in Pediatric Pulmonology during 2016. We also include articles from a variety of journals that are thematically related to these articles, or are of special interest to clinicians.
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Affiliation(s)
- Adrienne P Savant
- Division of Pulmonary Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Illinois.,Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Susanna A McColley
- Division of Pulmonary Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Illinois.,Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois.,Stanley Manne Children's Resear ch Institute, Chicago, Illinois
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31
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Caggana M. Newborn screening for cystic fibrosis: can one algorithm fit all? Expert Rev Mol Diagn 2017; 17:205-207. [DOI: 10.1080/14737159.2017.1288100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Michele Caggana
- Newborn Screening Program, New York State Department of Health, Division of Genetics, Wadsworth Center, Albany, NY, USA
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32
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Farrell PM, White TB, Howenstine MS, Munck A, Parad RB, Rosenfeld M, Sommerburg O, Accurso FJ, Davies JC, Rock MJ, Sanders DB, Wilschanski M, Sermet-Gaudelus I, Blau H, Gartner S, McColley SA. Diagnosis of Cystic Fibrosis in Screened Populations. J Pediatr 2017; 181S:S33-S44.e2. [PMID: 28129810 DOI: 10.1016/j.jpeds.2016.09.065] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE Cystic fibrosis (CF) can be difficult to diagnose, even when newborn screening (NBS) tests yield positive results. This challenge is exacerbated by the multitude of NBS protocols, misunderstandings about screening vs diagnostic tests, and the lack of guidelines for presumptive diagnoses. There is also confusion regarding the designation of age at diagnosis. STUDY DESIGN To improve diagnosis and achieve standardization in definitions worldwide, the CF Foundation convened a committee of 32 experts with a mission to develop clear and actionable consensus guidelines on diagnosis of CF with an emphasis on screened populations, especially the newborn population. A comprehensive literature review was performed with emphasis on relevant articles published during the past decade. RESULTS After reviewing the common screening protocols and outcome scenarios, 14 of 27 consensus statements were drafted that apply to screened populations. These were approved by 80% or more of the participants. CONCLUSIONS It is recommended that all diagnoses be established by demonstrating dysfunction of the CF transmembrane conductance regulator (CFTR) channel, initially with a sweat chloride test and, when needed, potentially with newer methods assessing membrane transport directly, such as intestinal current measurements. Even in babies with 2 CF-causing mutations detected via NBS, diagnosis must be confirmed by demonstrating CFTR dysfunction. The committee also recommends that the latest classifications identified in the Clinical and Functional Translation of CFTR project [http://www.cftr2.org/index.php] should be used to aid with CF diagnosis. Finally, to avoid delays in treatment, we provide guidelines for presumptive diagnoses and recommend how to determine the age of diagnosis.
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Affiliation(s)
- Philip M Farrell
- Departments of Pediatrics and Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | | | - Michelle S Howenstine
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Indiana University School of Medicine, Riley Hospital for Children, Indianapolis, IN
| | - Anne Munck
- Centres de Ressources et de Compétences pour la Mucoviscidose, Hôpital Robert Debre, Paris, France
| | - Richard B Parad
- Department of Pediatric and Newborn Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, MA
| | - Margaret Rosenfeld
- Department of Pediatrics, Seattle Children's Research Institute, University of Washington School of Medicine, Seattle, WA
| | | | - Frank J Accurso
- Children's Hospital Colorado, University of Colorado School of Medicine, Aurora, CO
| | - Jane C Davies
- Pediatric Respirology and Experimental Medicine, Imperial College London and Pediatric Respiratory Medicine, Royal Brompton and Harefield National Health Service Foundation Trust, London, United Kingdom
| | - Michael J Rock
- Departments of Pediatrics and Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Don B Sanders
- Department of Pediatrics, Section of Pediatric Pulmonology, Allergy and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN
| | - Michael Wilschanski
- Pediatric Gastroenterology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Isabelle Sermet-Gaudelus
- Institut Necker Enfants Malades/INSERM U1151, Hôpital Necker Enfants Malades, Centres de Ressources et de Compétences pour la Mucoviscidose, Paris, France
| | - Hannah Blau
- Sackler Faculty of Medicine, Graub Cystic Fibrosis Center, Pulmonary Institute Schneider Children's Medical Center of Israel, Petah Tikva, Tel Aviv University, Tel Aviv, Israel
| | | | - Susanna A McColley
- Ann and Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, IL
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33
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Kharrazi M. Evaluation of a New Newborn Screening Model for Cystic Fibrosis. J Pediatr 2016; 175:7-9. [PMID: 27255858 DOI: 10.1016/j.jpeds.2016.05.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 05/06/2016] [Indexed: 12/01/2022]
Affiliation(s)
- Martin Kharrazi
- Environmental Health Investigations Branch, California Department of Public Health, Richmond, California
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34
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Toward quality improvement in cystic fibrosis newborn screening: Progress and continuing challenges. J Cyst Fibros 2016; 15:267-9. [PMID: 27172835 DOI: 10.1016/j.jcf.2016.04.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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