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  string(122) "A systematic review and individual patient data meta-analysis of physiological biomarkers in idiopathic pulmonary fibrosis"
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  string(699) "Idiopathic pulmonary fibrosis (IPF) is a devastating condition which causes scarring of the lungs and affects around 3 million people worldwide. Disease trajectory is variable, with some patients progressing much quicker than others. Identifying early predictors of progression may enable relevant therapies to be offered at an early stage. Physiological biomarkers such as lung function (FVC, DLCO) and total distance walked in 6 minutes (6MWD) are non-invasive measurements. We therefore hope to collate data from clinical trial placebo arms to explore whether short term change in these measurements may be able to predict clinical outcomes. This will help better inform healthcare professionals."
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  ["property_scientific_abstract"]=>
  string(1616) "Prospero protocol: https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=164935

Background: Idiopathic Pulmonary Fibrosis (IPF) is a devastating lung condition of unknown origin, characterised by variable and unpredictable disease behaviour. A number of studies evaluating the role of physiological biomarkers in predicting progression have been published.

Objectives: We aim to conduct a systematic review and meta-analysis of individual patient data of treatment naive IPF patients (placebo arm) to assess whether baseline and/or short term change in physiological biomarkers can accurately predict important clinical outcomes such as disease progression and mortality.   

Study Design: Individual patient data from randomised interventional clinical trial placebo arms will be analysed, and a two-step meta-analysis performed.

Participants: Adult patients with untreated IPF evaluated in interventional clinical trials (placebo arms only). 

Main outcome measures: Mortality and disease progression (defined as relative decline in forced vital capacity of at least 10%, or death, at 12 months)

Statistical analysis: Individual patient data will be sought and a two-step meta-analysis performed adjusted for a priori confounders including age, sex and smoking status. Hazard ratios for baseline and three month change of physiological parameters in predicting mortality will be calculated. Disease progression will be standardised as 10% relative decline in FVC or death within 12 months of baseline, and odds ratios for predicting disease progression calculated."
  ["project_brief_bg"]=>
  string(1043) "Idiopathic pulmonary fibrosis (IPF) is a devastating lung condition of unknown origin characterised by progressive and irreversible interstitial fibrosis. Although median survival is 3 years, IPF is manifest by variable and unpredictable disease trajectory amongst individual patients. Advances in the management of IPF are hampered by the absence of validated prognostic measures, especially biomarkers that change over short time periods. Physiological biomarkers (such as but not limited to forced vital capacity (FVC), diffusing capacity for carbon monoxide (DLCO) and six minute walk distance (6MWD)) may be suitable as early predictive markers of disease behaviour enabling stratification of therapy and personalised medicine. 

We aim to conduct a systematic review and meta-analysis of individual patient data of treatment naive IPF patients (placebo arm) to assess whether baseline and/or short term change in physiological biomarkers can accurately predict important clinical outcomes such as disease progression and mortality."
  ["project_specific_aims"]=>
  string(202) "Research question - Do baseline values or 3-month change in physiological (FVC, DLCO, 6MWD) biomarkers predict disease progression and mortality in untreated patients with idiopathic pulmonary fibrosis?"
  ["project_study_design"]=>
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  ["project_study_design_exp"]=>
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  ["project_purposes"]=>
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  }
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  ["project_research_methods"]=>
  string(459) "Types of study to be included

Inclusion: Placebo arms of randomised interventional clinical trials in adult (aged>18) patients with IPF.

Exclusion: Non-interventional studies, conference abstracts, letters, commentaries, correspondence, case reports, expert opinions, editorials, other non-original systematic reviews, retrospective studies and animal studies. Studies investigating non-IPF Interstitial Lung Diseases. Studies with sample size n"
  ["project_main_outcome_measure"]=>
  string(825) "Participants/population

Adult patients aged > 18 with untreated idiopathic pulmonary fibrosis diagnosed according to contemporaneous consensus guidelines.

Intervention(s), exposure(s)

Physiological biomarkers (Forced Vital Capacity, Gas transfer and 6-minute walk test) at the following time points:

1) Baseline

2) Change over 3 months.

Comparator(s)/control

Age, Gender, Smoking

Context

Main outcome(s)

Overall mortality.

Timing and effect measures

All time periods.

Additional outcome(s)

1) Absolute or relative percentage change from baseline in FVC at 12 months

2) Disease progression at 12 months defined as:

a. >10% relative decline in FVC

b. Death

Timing and effect measures

12 months."
  ["project_main_predictor_indep"]=>
  string(87) "Baseline FVC, DLCO and 6 min walk distance

Change in 3 month of above parameters"
  ["project_other_variables_interest"]=>
  string(642) "-          Patient pseudoID

-          Age at consent

-          Height (cm)

-          Ethnicity

-          Gender (M or F)

-          Smoking (ever or never)

-          Follow up time (days)

-          Dead or alive at end

-          Time to death (days)

-          Baseline FVC (L)

-          Baseline FVC (% predicted)

-          3 month FVC (L)

-          3 month FVC (% predicted)

-          12 month FVC (L)

-          12 month FVC (% predicted)

-          Baseline DLCO (% predicted)

-          Baseline DLCO (ml/min/mmHg)"
  ["project_stat_analysis_plan"]=>
  string(1141) "A narrative synthesis of the findings from the included studies will be presented according to the review question, with summary tables inclusive of study and participant characteristics. Derivation and validation cohorts from the same study will be treated as two individual cohorts.

Correlation of physiological performance over 3 months and twelve months from baseline will be assessed in a repeated measures design, relevant time-point meta-analysis. Individual patient data will be sought and a two-step meta-analysis performed adjusted for a priori confounders including age, sex and smoking status.

Hazard ratios for baseline and three month change of physiological parameters in predicting mortality will be calculated. Disease progression will be standardised as 10% relative decline in FVC or death within 12 months of baseline, and odds ratios for predicting disease progression calculated. Data will be graphically displayed using forest plots.

Heterogeneity will be assessed by Cochran's Q and I using random effects. Synthesis criteria exclude sample sizes that are not conducive to random effect models (n"
  ["project_timeline"]=>
  string(143) "Start date - 1st Feb 2020

Analysis completion date - 1st Dec 2020

Manuscript drafted/results reported back to Yoda - 1st Feb 2021"
  ["project_dissemination_plan"]=>
  string(529) "All data will be anonymised and grouped for presentation and publication. The results from this study will be publicised at regional and national conferences as well as being submitted for publication in open access peer-reviewed journals in accordance with UK Research Council policies. No participants will be identified in any publications that arise from this research.

Conferences work to be submitted to include: British Thoracic Society Winter Meeting, European Respiratory Society Congress

Journals - Thorax"
  ["project_bibliography"]=>
  string(1212) "
1. Navaratnam V, Fleming KM, West J, et al. The rising incidence of idiopathic pulmonary fibrosis in the U.K. Thorax 2011;66(6):462-7. doi: 10.1136/thx.2010.148031

2. Raghu G, Weycker D, Edelsberg J, et al. Incidence and prevalence of idiopathic pulmonary fibrosis. Am J Respir Crit Care Med 2006;174(7):810-6. doi: 10.1164/rccm.200602-163OC [published Online First: 2006/07/01]

3. Lederer DJ, Martinez FJ. Idiopathic Pulmonary Fibrosis. N Engl J Med 2018;378(19):1811-23. doi: 10.1056/NEJMra1705751 [published Online First: 2018/05/10]

4. Navaratnam V, Hubbard RB. The Mortality Burden of Idiopathic Pulmonary Fibrosis in the United Kingdom. Am J Respir Crit Care Med 2019 doi: 10.1164/rccm.201902-0467LE [published Online First: 2019/04/12]

5. Martinez FJ, Collard HR, Pardo A, et al. Idiopathic pulmonary fibrosis. Nat Rev Dis Primers 2017;3:17074. doi: 10.1038/nrdp.2017.74 [published Online First: 2017/10/21]

6. Ley B, Collard HR, King TE, Jr. Clinical course and prediction of survival in idiopathic pulmonary fibrosis. American journal of respiratory and critical care medicine 2011;183(4):431-40. doi: 10.1164/rccm.201006-0894CI [published Online First: 2010/10/12]
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