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American Academy of Pediatrics
Article

Hyperbilirubinemia, Phototherapy, and Childhood Asthma

Michael W. Kuzniewicz, Hamid Niki, Eileen M. Walsh, Charles E. McCulloch and Thomas B. Newman
Pediatrics October 2018, 142 (4) e20180662; DOI: https://doi.org/10.1542/peds.2018-0662
Michael W. Kuzniewicz
aDivision of Research, Kaiser Permanente, Oakland, California; and
bDepartments of Pediatrics and
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Hamid Niki
aDivision of Research, Kaiser Permanente, Oakland, California; and
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Eileen M. Walsh
aDivision of Research, Kaiser Permanente, Oakland, California; and
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Charles E. McCulloch
cEpidemiology and Biostatistics, University of California, San Francisco, San Francisco, California
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Thomas B. Newman
bDepartments of Pediatrics and
cEpidemiology and Biostatistics, University of California, San Francisco, San Francisco, California
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Abstract

OBJECTIVES: Our aim was to quantify the associations of both hyperbilirubinemia and phototherapy with childhood asthma using a population-based cohort with total serum bilirubin (TSB) levels.

METHODS: Retrospective cohort study of infants born at ≥35 weeks’ gestation in the Kaiser Permanente Northern California health system (n = 109 212) from 2010 to 2014. Cox models were used to estimate hazard ratios (HRs) for a diagnosis of asthma.

RESULTS: In the study, 16.7% of infants had a maximum TSB level of ≥15 mg/dL, 4.5% of infants had a maximum TSB level of ≥18 mg/dL, and 11.5% of infants received phototherapy. Compared with children with a maximum TSB level of 3 to 5.9 mg/L, children with a TSB level of 9 to 11.9 mg/dL, 12 to 14.9 mg/dL, and 15 to 17.9 mg/dL were at an increased risk for asthma (HR: 1.22 [95% confidence interval (CI): 1.11–1.3], HR: 1.18 [95% CI: 1.08–1.29], and HR: 1.30 [95% CI: 1.18–1.43], respectively). Children with a TSB level of ≥18 mg/dL were not at an increased risk for asthma (HR: 1.04; 95% CI: 0.90–1.20). In propensity-adjusted analyses, phototherapy was not associated with asthma (HR: 1.07; 95% CI: 0.96–1.20).

CONCLUSIONS: Modest levels of hyperbilirubinemia were associated with an increased risk of asthma, but an association was not seen at higher levels. No dose-response relationship was seen. Using phototherapy to prevent infants from reaching these modest TSB levels is unlikely to be protective against asthma.

  • Abbreviations:
    AAP —
    American Academy of Pediatrics
    aOR —
    adjusted odds ratio
    CI —
    confidence interval
    HR —
    hazard ratio
    IRR —
    incidence rate ratio
    KPNC —
    Kaiser Permanente Northern California
    Th —
    T helper
    Th2 —
    T helper 2
    TSB —
    total serum bilirubin
  • What’s Known on This Subject:

    Observational studies have revealed an association between hyperbilirubinemia and/or phototherapy and childhood asthma. In many studies, researchers have only used codes for hyperbilirubinemia or jaundice and have lacked the ability to distinguish between the effects of hyperbilirubinemia and its treatment.

    What This Study Adds:

    By using actual bilirubin levels, modest levels of hyperbilirubinemia were associated with a slightly increased risk of asthma in a large modern cohort, but an association was not seen at higher levels. Phototherapy did not alter the risk of asthma.

    The prevalence of childhood asthma has been increasing worldwide, and asthma is one of the most common childhood diseases, yet much remains to be elucidated concerning its etiology.1 There is clearly a genetic predisposition, and the interaction between the environmental pollutants and/or allergens, inflammatory mediators, and cellular response play a crucial role in its pathogenesis.2–6 Reactive oxygen species that are generated by both cellular metabolism and environmental pollutants result in oxidant injury and contribute to the severity and symptom exacerbation of asthma.3,7,8

    Observational studies have revealed an association between hyperbilirubinemia and/or phototherapy and childhood asthma.9–14 Using the Swedish birth registry, Aspberg et al10 first reported an association between a diagnosis of icterus or history of phototherapy and hospitalizations for asthma after 2 years of age (adjusted odds ratio [aOR]: 1.27; 95% confidence interval [CI]: 1.08–1.50). The group confirmed their findings using an outcome of asthma, which was defined by receiving medications for asthma.11 Similarly, a Chinese9 (aOR: 1.64; 95% CI: 1.36–1.98) and Taiwanese study12 (adjusted hazard ratio [HR]: 1.21; 95% CI: 1.15–1.27) revealed an association between a diagnosis of neonatal jaundice and an inpatient or outpatient diagnosis of asthma later in childhood.

    None of the authors of these studies analyzed actual bilirubin levels; all relied only on a diagnosis of jaundice.

    Because phototherapy is a primary treatment of neonatal jaundice, it is hard to distinguish the effects of phototherapy from those of jaundice. The only study in which actual bilirubin levels were included was an examination of data from the US Collaborative Perinatal Project; subjects were enrolled in 1959–1965, before the use of phototherapy.13 Total serum bilirubin (TSB) levels were obtained on all infants at 36 to 60 hours after birth and repeated 24 hours later if the TSB level was >10 mg/dL. Compared with infants with a maximum TSB level of ≤3 mg/dL, infants with a maximum TSB level as low as 6.1 to 9 mg/dL were more likely to be diagnosed with asthma before age 7 years. Infants with a maximum TSB level of ≥15 mg/dL had the highest increased risk of asthma (aOR: 1.61; 95% CI: 1.04–2.08).

    Our objective was to quantify the associations of both hyperbilirubinemia and phototherapy with childhood asthma, controlling for confounding using a large, modern, and population-based cohort and actual TSB levels.

    Methods

    Study Design

    We performed a retrospective cohort study as an extension of the Late Impact of Getting Hyperbilirubinemia or Phototherapy study.15–20 The Institutional Review Boards at Kaiser Permanente Northern California (KPNC) and the University of California, San Francisco, approved the study.

    Population

    The cohort included infants born at ≥35 weeks’ gestation at KPNC hospitals between January 1, 2010, and December 31, 2014. Only the 11 facilities that were employing universal bilirubin screening with TSB levels before discharge were included. To ensure full ascertainment of bilirubin levels, infants had to remain in the KPNC system during their entire birth hospitalization (n = 126 376). To assess asthma outcomes, we excluded children who did not remain in the health plan for at least 25 months after birth (n = 17 496). We excluded 332 children with no TSB levels. The final study cohort consisted of 109 212 children.

    Predictors

    Bilirubin Measurement

    From existing KPNC laboratory databases, we obtained all TSB levels from an infant’s first month after birth using previously described methods.21 We excluded any TSB measurements for which a corresponding conjugated or direct bilirubin measurement constituted ≥50% of the TSB level. These infants represent a small and different population of infants and are also excluded from the American Academy of Pediatrics (AAP) guideline.22 TSB levels were obtained before discharge or if clinically indicated. Subsequent TSB testing was done at the discretion of the treating physicians. A bilirubin measurement was performed by using the Vitros BuBc Neonatal Bilirubin assay (Ortho Clinical Diagnostics, Raritan, NJ).23,24 In May 2012, Ortho Clinical Diagnostics adjusted the calibrator values for Vitros BuBc Slides,25 so we included an indicator variable for whether the TSB level was obtained before or after recalibration in analyses.

    Phototherapy

    We classified infants as having received inpatient phototherapy if they had either a phototherapy nursing flow sheet or both a procedure code and an order for phototherapy. Home phototherapy was determined from the KPNC durable medical equipment database.

    Additional Covariables

    From the KPNC electronic data sources, we abstracted covariates, including maternal age, maternal race and/or ethnicity, infant sex, gestational age, birth weight, 5-minute Apgar score, year, and hospital of birth, and the results of a direct antiglobulin test and glucose-6-phosphate dehydrogenase activity, if performed. A maternal history of asthma was defined as 2 asthma diagnoses (International Classification of Diseases, Ninth Revision diagnosis code 493.×) in the mother from any outpatient or inpatient encounter, separated by at least 30 days, occurring within 10 years before the birth of the infant (obtained from the KPNC Virtual Data Warehouse).26 We classified feeding during the birth hospitalization as exclusively breastfed, received 1 formula feeding, or received >1 formula feeding.

    Outcomes

    An occurrence of asthma was defined as a child having both (1) at least 2 asthma diagnoses from any outpatient or inpatient encounter, separated by at least 30 days, occurring after 2 years of age and (2) at least 2 asthma medication prescriptions in a 12-month period, separated by at least 30 days, prescribed after 2 years of age. Medications that were considered asthma medications were short- or long-acting β-agonists, inhaled corticosteroids, a combination inhaled corticosteroid and long-acting β-agonist, or a montelukast.

    Follow-up Time

    Length of follow-up varied in this study because some subjects left the KPNC health care system and follow-up began at birth (2010–2014) but ended in 2017 for all subjects. For purposes of quantifying incidence rates and using proportional hazards models, follow-up for each member of the cohort began at either age 2 years and ended at death, at the date when the individual met all criteria for asthma (2 asthma diagnoses and 2 medication prescriptions), or at the last follow-up date, which was defined as the last day of the last calendar month of coverage by the KPNC health plan or the last encounter date through April 30, 2017, whichever came later.

    Statistical Analysis

    We calculated crude incidence rates by dividing asthma cases by person years of follow-up, and we calculated CIs for comparing incidence rate ratios (IRRs) using exact binomial calculations. We used Cox proportional hazards models to evaluate the independent associations between hyperbilirubinemia and asthma and phototherapy and asthma, adjusting for potential confounders. We investigated which variables were independently associated with asthma in models that included maximum TSB levels and phototherapy. Covariables with a significance value of P < .05 were included in the final model.

    In addition to traditional models, we used a phototherapy propensity score among infants who had a TSB level within 3 mg/dL of the AAP phototherapy threshold, as previously described.16 We categorized propensity scores for phototherapy by decile. In propensity-adjusted analyses we controlled for measured confounding variables by creating a model for the probability of exposure (in this case, phototherapy) and then controlled for that probability. This allowed us to adjust for TSB levels before but not after phototherapy, thus allowing us to investigate whether phototherapy might reduce the risk of asthma by preventing hyperbilirubinemia. We performed all analyses using Stata version 15 (Stata Corp, College Station, TX).

    Results

    Characteristics of the study cohort by asthma status are shown in Table 1. As expected, African American children, children of mothers with a history of asthma, and infants of lower gestational age were overrepresented in the asthma group. Infants who were exclusively breastfed during the birth hospitalization were underrepresented in the asthma group. Infants who received phototherapy were overrepresented in the asthma group.

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    TABLE 1

    Characteristics of the Cohort by Asthma Status

    Of the 109 212 children in the cohort, 16.7% (18 205) had a maximum TSB level of ≥15 mg/dL, and 4.7% (4865) had a maximum TSB level of ≥18 mg/dL. Phototherapy was administered to 11.5% (12 533) of the children. The majority of children who were treated received inpatient phototherapy (8.9%), whereas a minority (2.5%) received only home phototherapy. Children were managed for a total of 263 967 person years after age 2 years. The mean age at the last follow-up was 4.4 (SD: 1.5) years. In the study, 4854 (4.4%) children met the criteria for asthma (incidence rate: 18.4 per 1000 person years). The mean age to achieving criteria for an asthma diagnosis was 3.6 (SD: 1.1) years old.

    Asthma cases, the cumulative incidence of asthma, the incidence rate, and IRRs by maximum TSB level category are shown in Table 2. Although incidence rates for asthma increased significantly for maximum TSB levels between 9 and 17.9 mg/dL compared with maximum TSB levels between 3 and 5.9 mg/dL, there was not a significant increase in incidence rates for asthma in children with maximum TSB levels of ≥18 mg/dL. Figure 1 includes the asthma incidence rate by maximum TSB level. No clear relationship is present.

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    TABLE 2

    Cumulative Incidence, Incidence Rate, and IRRs of Asthma by Maximum TSB Level Category

    FIGURE 1
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    FIGURE 1

    Maximum TSB levels and asthma incidence rates. TSB levels are categorized by 1 mg/dL intervals (eg, 3–3.9 mg/dL = 3 mg/dL level group).

    For the Cox proportional hazards models, sex, maternal history of asthma, cesarean delivery, birth hospitalization length of stay >7 days, recalibration, race, maternal age, gestational age, birth facility, birth year, and feeding type during the birth hospitalization were included in the final model. In the final model, phototherapy was not associated with asthma (HR: 1.01; 95% CI: 0.92–1.11; Table 3). Maximum TSB levels between 9 and 17.9 mg/dL were associated with an elevated HR for asthma; however, there was no association between a TSB level of ≥18 mg/dL and asthma. In our cohort, 88% of those who met criteria for an asthma diagnosis, met criteria before 5 years of age. Limiting the analysis to individuals with at least 5 years of follow-up yielded similar associations with TSB levels. In additional analyses, we separated home phototherapy and inpatient phototherapy. Neither was associated with asthma (HR: 0.98 [95% CI: 0.86–1.16] for inpatient phototherapy; HR: 1.01 [95% CI: 0.85–1.19] for home phototherapy). Lastly, restricting the model to infants with a positive Coombs test revealed higher TSB levels to be protective.

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    TABLE 3

    Cox Proportional Hazards Model

    In the subset of infants with a TSB level within 3 mg/dL of the AAP phototherapy threshold before any treatment with phototherapy (n = 28 290), phototherapy was not associated with childhood asthma (HR: 1.07; 95% CI: 0.96–1.20; controlling for the propensity to receive phototherapy).

    Discussion

    In a large modern cohort, with TSB levels for all subjects, we found that infants with moderately elevated maximum TSB levels (9–17.9 mg/dL) were more likely to develop asthma later in childhood. This association did not persist for infants with maximum TSB levels of ≥18 mg/dL. We found no association between phototherapy and asthma when adjusting for the maximum TSB level or in analyses when adjusting for a propensity to receive phototherapy.

    Although we have confirmed an association between moderately elevated bilirubin levels at birth and the development of asthma later in childhood, the question is if the association is causal. There is undoubtedly consistency because this association has now been seen in diverse populations in Sweden,10,11 Taiwan,12 China,9 and now in a historic13 and modern cohort in the United States. The strength of the association in the aforementioned studies ranged from aORs of 1.37 to 1.64. The strength of the association in our study was attenuated, which may be secondary to our controlling for other important predicators, such as a history of maternal asthma and the more specific definition of asthma that we used.

    Is there any biological plausibility for why hyperbilirubinemia or phototherapy may result in asthma? In vivo, bilirubin plays an important role as an antioxidant; however, at higher levels (>20 mg/dL) bilirubin fails to provide protection.27–30 Perhaps a resultant oxidant–antioxidant imbalance may result in airway inflammation, with the development of asthma later in life.3 Our results do not support this mechanism because it would predict the risk to be greatest in children with the highest maximum TSB level. This rationale also requires that a brief exposure early in life would result in enough injury that would predispose an individual to asthma many years later, which seems unlikely.

    Others have suggested that bilirubin may influence the immune system.31–33 Unconjugated bilirubin may shift the T helper (Th) cell balance of T helper 1 to T helper 2 (Th2) toward the Th2 phenotype through an inhibition of interleukin-2 production.34 A Th2 predominance had been associated with the development of allergy and asthma.35,36 Interleukin-2 is essential for the development and maintenance of T regulatory cells, which play an important role in regulating immunologic processes in peripheral tolerance to allergens.37,38 The exposure is brief, but perhaps an alteration in cytokine production with hyperbilirubinemia could favor intolerance at a critical time in immune system development. However, our data did not reveal a biological gradient or dose response of maximum bilirubin level and the risk of asthma. In fact, as maximum TSB levels increased, we saw a fall in the incidence of asthma after a maximum TSB level of 16 mg/dL. In comparison, the Collaborative Perinatal Project revealed a trend of an increasing risk of asthma with higher TSB levels at 48 hours and maximum TSB levels,13 with the highest risk in children with a TSB level of >15 mg/dL. However, we were able to look at more gradations >15 mg/dL rather than group all the individuals together. Although the Collaborative Perinatal Project had 901 infants with a TSB level of >15 mg/dL, we had 13 340 infants with a maximum TSB level of 15 to 17.9 mg/dL and another 4865 infants with a maximum TSB level of 18 to 20.9 mg/dL.

    If hyperbilirubinemia is implicated in the development of asthma, could the effect be ameliorated or prevented by treatment? No differences in the risk of asthma were seen between infants who were and were not treated with phototherapy. This may not fully answer the question, however, because the increased risk was seen at maximum TSB levels as low as 9 mg/dL. Many infants may have already reached TSB levels that are associated with an increased risk of asthma but are well below AAP recommended thresholds for phototherapy. Because there was no dose-response relationship between maximum TSB levels and asthma risk, preventing higher levels through phototherapy may not have any effect on asthma risk unless started at much lower thresholds.

    The most likely alternative explanation for this association is a confounder, such as a genetic predisposition to both moderate hyperbilirubinemia and asthma. A potential example is polymorphisms in the glutathione S-transferase (GST) gene. Mutations have been linked to both neonatal hyperbilirubinemia39,40 and asthma.41–47 GSTs can function both as enzymes and as intracellular binding proteins for nonsubstrate ligands, such as bilirubin and bilirubin conjugates, decreasing reflux from the hepatocytes back into plasma.48 Neonates with the GSTM1-null genotype have higher TSB levels compared with those with the wild phenotype.39,40 GST is also involved in cytoprotection from byproducts of oxidative stress.49 GST is widely expressed in human airways and may play a role in modifying the risk of allergic response to environmental pollutants.50–52 Multiple meta-analyses of the association between GST genes and asthma have had conflicting results and have been hampered by study heterogeneity.42–45 The polymorphism is not rare, which adds to the plausibility; the frequency of the GSTM1-null genotype is ∼50% in white individuals and ∼20% in African Americans.53

    A possible explanation to why an association was seen between moderate hyperbilirubinemia and asthma and not a more severe hyperbilirubinemia may relate to the etiology of hyperbilirubinemia. Moderate hyperbilirubinemia may be associated with polymorphisms in the GST gene, whereas a more severe hyperbilirubinemia may be seen more commonly with etiologies, such as ABO incompatibility, glucose-6-phosphate dehydrogenase deficiency, or sepsis. As a result, a common gene polymorphism that leads to moderate hyperbilirubinemia may be the etiology of hyperbilirubinemia in a greater percentage of infants with moderate hyperbilirubinemia, whereas in infants with severe hyperbilirubinemia, other etiologies are more common. Another possibility may be that there are 2 conflicting mechanisms. Bilirubin is both causal and protective at different levels, and at a level of >18 mg/dL, the protective mechanism overcomes the causal one.

    Further lessening the case for causality, in both this study and past studies, TSB levels of <10 mg/dL were associated with asthma. The low bilirubin levels make it more plausible that it is not the bilirubin itself that is increasing the risk of asthma but rather a confounder.

    A finding in our results that deserves further examination was that any formula feeding, even a single formula feeding during the birth hospitalization, was associated with an increased risk for developing childhood asthma. The extent to which formula feeding during the birth hospitalization serves as simply an indication of formula feeding in the subsequent months is unknown.

    A major strength of our study is the large, modern, and diverse cohort. Homogenous populations were used in many of the previous studies, whereas in our cohort, there was representation of many races and ethnicities, increasing its generalizability. For our main predictors, we had actual bilirubin levels rather than codes for jaundice, and we used both orders and flow sheets for phototherapy rather than administrative codes. Additionally, our outcome variable was specific; multiple encounters were used with diagnostic codes in conjunction with pharmacy data that indicated the use of asthma medications. We were able to control for a large number of possible confounding variables, including infant feeding type (breast milk versus formula) during the birth hospitalization, maternal history of asthma, and gestational age. Using a modern cohort, we were limited by differential follow-up, although this was accounted for in our analyses by using Cox models.

    There is a possible underdiagnosis of asthma in those infants who were born in the later birth years because of a more limited follow-up. However, when we limited the analysis to those with at least 5 years of follow-up, the same associations persisted.

    Lastly, all bilirubin measurements were obtained as clinically indicated. Especially for infants with lower maximum TSB levels, an infant’s true maximum TSB level may have been higher but unmeasured because repeat testing may not have been clinically indicated if there was a low likelihood of reaching phototherapy treatment levels. However, this misclassification would have made it more difficult to detect an association in the study.

    Conclusions

    An association between modest levels of hyperbilirubinemia and asthma exists. The association is unlikely to be causal because no dose-response relationship was seen, with the highest levels of hyperbilirubinemia not being associated with asthma. A confounder, such as a genetic polymorphism, is more likely associated with both asthma and modestly decreased bilirubin conjugation. Phototherapy did not alter the risk of asthma. Using phototherapy to prevent infants from reaching these modest TSB levels is unlikely to be useful and would require phototherapy use in ∼50% of the birth population.

    Footnotes

      • Accepted July 11, 2018.
    • Address correspondence to Michael W. Kuzniewicz, MD, MPH, Division of Research, Kaiser Permanente, Office 022R09, 2000 Broadway, Oakland, CA 94612. E-mail: michael.w.kuzniewicz{at}kp.org
    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: Supported by grant R01HS020618 from the Agency for Healthcare Research and Quality. The content is solely the responsibility of the authors and does not necessarily represent the official views of the Agency for Healthcare Research and Quality. The funder played no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

    References

    1. ↵
      1. Eder W,
      2. Ege MJ,
      3. von Mutius E
      . The asthma epidemic. N Engl J Med. 2006;355(21):2226–2235pmid:17124020
      OpenUrlCrossRefPubMed
    2. ↵
      1. Subbarao P,
      2. Mandhane PJ,
      3. Sears MR
      . Asthma: epidemiology, etiology and risk factors. CMAJ. 2009;181(9):E181–E190pmid:19752106
      OpenUrlFREE Full Text
    3. ↵
      1. Nadeem A,
      2. Masood A,
      3. Siddiqui N
      . Oxidant–antioxidant imbalance in asthma: scientific evidence, epidemiological data and possible therapeutic options. Ther Adv Respir Dis. 2008;2(4):215–235pmid:19124374
      OpenUrlCrossRefPubMed
      1. Wills-Karp M,
      2. Luyimbazi J,
      3. Xu X, et al
      . Interleukin-13: central mediator of allergic asthma. Science. 1998;282(5397):2258–2261pmid:9856949
      OpenUrlAbstract/FREE Full Text
      1. Holt PG,
      2. Macaubas C,
      3. Stumbles PA,
      4. Sly PD
      . The role of allergy in the development of asthma. Nature. 1999;402(suppl 6760):B12–B17pmid:10586890
      OpenUrlPubMed
    4. ↵
      1. Marguet C,
      2. Jouen-Boedes F,
      3. Dean TP,
      4. Warner JO
      . Bronchoalveolar cell profiles in children with asthma, infantile wheeze, chronic cough, or cystic fibrosis. Am J Respir Crit Care Med. 1999;159(5, pt 1):1533–1540pmid:10228122
      OpenUrlCrossRefPubMed
    5. ↵
      1. Henricks PA,
      2. Nijkamp FP
      . Reactive oxygen species as mediators in asthma. Pulm Pharmacol Ther. 2001;14(6):409–420pmid:11782121
      OpenUrlCrossRefPubMed
    6. ↵
      1. Sugiura H,
      2. Ichinose M
      . Oxidative and nitrative stress in bronchial asthma. Antioxid Redox Signal. 2008;10(4):785–797pmid:18177234
      OpenUrlCrossRefPubMed
    7. ↵
      1. Wei CC,
      2. Lin CL,
      3. Shen TC,
      4. Kao CH
      . Neonatal jaundice and risks of childhood allergic diseases: a population-based cohort study. Pediatr Res. 2015;78(2):223–230pmid:25950455
      OpenUrlPubMed
    8. ↵
      1. Aspberg S,
      2. Dahlquist G,
      3. Kahan T,
      4. Källén B
      . Is neonatal phototherapy associated with an increased risk for hospitalized childhood bronchial asthma? Pediatr Allergy Immunol. 2007;18(4):313–319pmid:17346296
      OpenUrlCrossRefPubMed
    9. ↵
      1. Aspberg S,
      2. Dahlquist G,
      3. Kahan T,
      4. Källén B
      . Confirmed association between neonatal phototherapy or neonatal icterus and risk of childhood asthma. Pediatr Allergy Immunol. 2010;21(4, pt 2):e733–e739pmid:20444150
      OpenUrlCrossRefPubMed
    10. ↵
      1. Ku MS,
      2. Sun HL,
      3. Sheu JN,
      4. Lee HS,
      5. Yang SF,
      6. Lue KH
      . Neonatal jaundice is a risk factor for childhood asthma: a retrospective cohort study. Pediatr Allergy Immunol. 2012;23(7):623–628pmid:22957782
      OpenUrlCrossRefPubMed
    11. ↵
      1. Huang L,
      2. Bao Y,
      3. Xu Z, et al
      . Neonatal bilirubin levels and childhood asthma in the US Collaborative Perinatal Project, 1959-1965. Am J Epidemiol. 2013;178(12):1691–1697pmid:24186969
      OpenUrlCrossRefPubMed
    12. ↵
      1. Das RR,
      2. Naik SS
      . Neonatal hyperbilirubinemia and childhood allergic diseases: a systematic review. Pediatr Allergy Immunol. 2015;26(1):2–11pmid:25229699
      OpenUrlPubMed
    13. ↵
      1. Kuzniewicz MW,
      2. Wickremasinghe AC,
      3. Wu YW, et al
      . Incidence, etiology, and outcomes of hazardous hyperbilirubinemia in newborns. Pediatrics. 2014;134(3):504–509pmid:25092943
      OpenUrlAbstract/FREE Full Text
    14. ↵
      1. Newman TB,
      2. Wickremasinghe AC,
      3. Walsh EM,
      4. Grimes BA,
      5. McCulloch CE,
      6. Kuzniewicz MW
      . Retrospective cohort study of phototherapy and childhood cancer in Northern California. Pediatrics. 2016;137(6):e20151354pmid:27217477
      OpenUrlAbstract/FREE Full Text
      1. Newman TB,
      2. Wickremasinghe AC,
      3. Walsh EM,
      4. Grimes BA,
      5. McCulloch CE,
      6. Kuzniewicz MW
      . Phototherapy and risk of type 1 diabetes. Pediatrics. 2016;138(5):e20160687pmid:27940766
      OpenUrlAbstract/FREE Full Text
      1. Wickremasinghe AC,
      2. Risley RJ,
      3. Kuzniewicz MW, et al
      . Risk of sensorineural hearing loss and bilirubin exchange transfusion thresholds. Pediatrics. 2015;136(3):505–512pmid:26283777
      OpenUrlAbstract/FREE Full Text
      1. Wu YW,
      2. Kuzniewicz MW,
      3. Croen L,
      4. Walsh EM,
      5. McCulloch CE,
      6. Newman TB
      . Risk of autism associated with hyperbilirubinemia and phototherapy. Pediatrics. 2016;138(4):e20161813pmid:27669736
      OpenUrlAbstract/FREE Full Text
    15. ↵
      1. Wu YW,
      2. Kuzniewicz MW,
      3. Wickremasinghe AC, et al
      . Risk for cerebral palsy in infants with total serum bilirubin levels at or above the exchange transfusion threshold: a population-based study. JAMA Pediatr. 2015;169(3):239–246pmid:25560920
      OpenUrlCrossRefPubMed
    16. ↵
      1. Kuzniewicz MW,
      2. Escobar GJ,
      3. Newman TB
      . Impact of universal bilirubin screening on severe hyperbilirubinemia and phototherapy use. Pediatrics. 2009;124(4):1031–1039pmid:19786442
      OpenUrlAbstract/FREE Full Text
    17. ↵
      1. American Academy of Pediatrics Subcommittee on Hyperbilirubinemia
      . Management of hyperbilirubinemia in the newborn infant 35 or more weeks of gestation [published correction appears in Pediatrics. 2004;114(4):1138]. Pediatrics. 2004;114(1):297–316pmid:15231951
      OpenUrlAbstract/FREE Full Text
    18. ↵
      1. Kazmierczak SC,
      2. Robertson AF,
      3. Catrou PG,
      4. Briley KP,
      5. Kreamer BL,
      6. Gourley GR
      . Direct spectrophotometric method for measurement of bilirubin in newborns: comparison with HPLC and an automated diazo method. Clin Chem. 2002;48(7):1096–1097pmid:12089180
      OpenUrlFREE Full Text
    19. ↵
      1. Wu TW,
      2. Dappen GM,
      3. Powers DM,
      4. Lo DH,
      5. Rand RN,
      6. Spayd RW
      . The Kodak Ektachem clinical chemistry slide for measurement of bilirubin in newborns: principles and performance. Clin Chem. 1982;28(12):2366–2372pmid:7139916
      OpenUrlAbstract/FREE Full Text
    20. ↵
      1. Kuzniewicz MW,
      2. Greene DN,
      3. Walsh EM,
      4. McCulloch CE,
      5. Newman TB
      . Association between laboratory calibration of a serum bilirubin assay, neonatal bilirubin levels, and phototherapy use. JAMA Pediatr. 2016;170(6):557–561pmid:27064480
      OpenUrlCrossRefPubMed
    21. ↵
      1. Chimmula S,
      2. Dhuru R,
      3. Folck B, et al
      . PS2-44: VDW data sources: Kaiser Permanente Northern California. Clin Med Res. 2012;10(3):193
      OpenUrlAbstract/FREE Full Text
    22. ↵
      1. Shekeeb Shahab M,
      2. Kumar P,
      3. Sharma N,
      4. Narang A,
      5. Prasad R
      . Evaluation of oxidant and antioxidant status in term neonates: a plausible protective role of bilirubin. Mol Cell Biochem. 2008;317(1–2):51–59pmid:18560765
      OpenUrlCrossRefPubMed
      1. Dani C,
      2. Masini E,
      3. Bertini G, et al
      . Role of heme oxygenase and bilirubin in oxidative stress in preterm infants. Pediatr Res. 2004;56(6):873–877pmid:15470195
      OpenUrlCrossRefPubMed
      1. Sedlak TW,
      2. Snyder SH
      . Bilirubin benefits: cellular protection by a biliverdin reductase antioxidant cycle. Pediatrics. 2004;113(6):1776–1782pmid:15173506
      OpenUrlFREE Full Text
    23. ↵
      1. Stocker R,
      2. Yamamoto Y,
      3. McDonagh AF,
      4. Glazer AN,
      5. Ames BN
      . Bilirubin is an antioxidant of possible physiological importance. Science. 1987;235(4792):1043–1046pmid:3029864
      OpenUrlAbstract/FREE Full Text
    24. ↵
      1. Nejedlá Z
      . The development of immunological factors in infants with hyperbilirubinemia. Pediatrics. 1970;45(1):102–104pmid:5410230
      OpenUrlAbstract/FREE Full Text
      1. Ollinger R,
      2. Wang H,
      3. Yamashita K, et al
      . Therapeutic applications of bilirubin and biliverdin in transplantation. Antioxid Redox Signal. 2007;9(12):2175–2185pmid:17919067
      OpenUrlCrossRefPubMed
    25. ↵
      1. Rocuts F,
      2. Zhang X,
      3. Yan J, et al
      . Bilirubin promotes de novo generation of T regulatory cells. Cell Transplant. 2010;19(4):443–451pmid:20021735
      OpenUrlCrossRefPubMed
    26. ↵
      1. Haga Y,
      2. Tempero MA,
      3. Kay D,
      4. Zetterman RK
      . Intracellular accumulation of unconjugated bilirubin inhibits phytohemagglutin-induced proliferation and interleukin-2 production of human lymphocytes. Dig Dis Sci. 1996;41(7):1468–1474pmid:8689926
      OpenUrlCrossRefPubMed
    27. ↵
      1. Romagnani S
      . The Th1/Th2 paradigm and allergic disorders. Allergy. 1998;53(suppl 46):12–15pmid:9825989
      OpenUrlPubMed
    28. ↵
      1. Romagnani S
      . The role of lymphocytes in allergic disease. J Allergy Clin Immunol. 2000;105(3):399–408pmid:10719286
      OpenUrlCrossRefPubMed
    29. ↵
      1. Liao W,
      2. Lin JX,
      3. Leonard WJ
      . Interleukin-2 at the crossroads of effector responses, tolerance, and immunotherapy. Immunity. 2013;38(1):13–25pmid:23352221
      OpenUrlCrossRefPubMed
    30. ↵
      1. Akdis M,
      2. Blaser K,
      3. Akdis CA
      . T regulatory cells in allergy: novel concepts in the pathogenesis, prevention, and treatment of allergic diseases. J Allergy Clin Immunol. 2005;116(5):961–968; quiz 969pmid:16275361
      OpenUrlCrossRefPubMed
    31. ↵
      1. Abdel Ghany EA,
      2. Hussain NF,
      3. Botros SK
      . Glutathione S-transferase gene polymorphisms in neonatal hyperbilirubinemia. J Investig Med. 2012;60(1):18–22pmid:21997310
      OpenUrlAbstract/FREE Full Text
    32. ↵
      1. Muslu N,
      2. Dogruer ZN,
      3. Eskandari G,
      4. Atici A,
      5. Kul S,
      6. Atik U
      . Are glutathione S-transferase gene polymorphisms linked to neonatal jaundice? Eur J Pediatr. 2008;167(1):57–61pmid:17318621
      OpenUrlPubMed
    33. ↵
      1. Hoskins A,
      2. Wu P,
      3. Reiss S,
      4. Dworski R
      . Glutathione S-transferase P1 Ile105Val polymorphism modulates allergen-induced airway inflammation in human atopic asthmatics in vivo. Clin Exp Allergy. 2013;43(5):527–534pmid:23600543
      OpenUrlCrossRefPubMed
    34. ↵
      1. Piacentini S,
      2. Polimanti R,
      3. Simonelli I, et al
      . Glutathione S-transferase polymorphisms, asthma susceptibility and confounding variables: a meta-analysis. Mol Biol Rep. 2013;40(4):3299–3313pmid:23307299
      OpenUrlCrossRefPubMed
      1. Minelli C,
      2. Granell R,
      3. Newson R, et al
      . Glutathione-S-transferase genes and asthma phenotypes: a Human Genome Epidemiology (HuGE) systematic review and meta-analysis including unpublished data.Int J Epidemiol. 2010;39(2):539–562
      OpenUrlCrossRefPubMed
      1. Saadat M,
      2. Ansari-Lari M
      . Genetic polymorphism of glutathione S-transferase T1, M1 and asthma, a meta-analysis of the literature. Pak J Biol Sci. 2007;10(23):4183–4189pmid:19086569
      OpenUrlCrossRefPubMed
    35. ↵
      1. Li F,
      2. Li S,
      3. Chang H, et al
      . Quantitative assessment of the association between the GSTM1-null genotype and the risk of childhood asthma. Genet Test Mol Biomarkers. 2013;17(9):656–661pmid:23368529
      OpenUrlCrossRefPubMed
      1. Karam RA,
      2. Pasha HF,
      3. El-Shal AS,
      4. Rahman HM,
      5. Gad DM
      . Impact of glutathione-S-transferase gene polymorphisms on enzyme activity, lung function and bronchial asthma susceptibility in Egyptian children. Gene. 2012;497(2):314–319pmid:22326267
      OpenUrlCrossRefPubMed
    36. ↵
      1. Islam T,
      2. Berhane K,
      3. McConnell R, et al
      . Glutathione-S-transferase (GST) P1, GSTM1, exercise, ozone and asthma incidence in school children. Thorax. 2009;64(3):197–202pmid:18988661
      OpenUrlPubMed
    37. ↵
      1. Sherlock S,
      2. Dooley J
      . Diseases of the Liver and Biliary System. 11th ed. Milan, Italy: Blackwell Science; 2002
    38. ↵
      1. Hayes JD,
      2. Flanagan JU,
      3. Jowsey IR
      . Glutathione transferases. Annu Rev Pharmacol Toxicol. 2005;45:51–88pmid:15822171
      OpenUrlCrossRefPubMed
    39. ↵
      1. Gilliland FD,
      2. Li YF,
      3. Saxon A,
      4. Diaz-Sanchez D
      . Effect of glutathione-S-transferase M1 and P1 genotypes on xenobiotic enhancement of allergic responses: randomised, placebo-controlled crossover study. Lancet. 2004;363(9403):119–125pmid:14726165
      OpenUrlCrossRefPubMed
      1. Rahman I,
      2. Biswas SK,
      3. Kode A
      . Oxidant and antioxidant balance in the airways and airway diseases. Eur J Pharmacol. 2006;533(1–3):222–239pmid:16500642
      OpenUrlCrossRefPubMed
    40. ↵
      1. Strange RC,
      2. Spiteri MA,
      3. Ramachandran S,
      4. Fryer AA
      . Glutathione-S-transferase family of enzymes. Mutat Res. 2001;482(1–2):21–26pmid:11535245
      OpenUrlCrossRefPubMed
    41. ↵
      1. Ginsberg G,
      2. Smolenski S,
      3. Hattis D,
      4. Guyton KZ,
      5. Johns DO,
      6. Sonawane B
      . Genetic polymorphism in glutathione transferases (GST): population distribution of GSTM1, T1, and P1 conjugating activity. J Toxicol Environ Health B Crit Rev. 2009;12(5–6):389–439pmid:20183528
      OpenUrlCrossRefPubMed
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    Hyperbilirubinemia, Phototherapy, and Childhood Asthma
    Michael W. Kuzniewicz, Hamid Niki, Eileen M. Walsh, Charles E. McCulloch, Thomas B. Newman
    Pediatrics Oct 2018, 142 (4) e20180662; DOI: 10.1542/peds.2018-0662

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    Hyperbilirubinemia, Phototherapy, and Childhood Asthma
    Michael W. Kuzniewicz, Hamid Niki, Eileen M. Walsh, Charles E. McCulloch, Thomas B. Newman
    Pediatrics Oct 2018, 142 (4) e20180662; DOI: 10.1542/peds.2018-0662
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