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  ["project_title"]=>
  string(82) "Using Synthetic Controls to Improve Randomised Controlled Trials for Rare Diseases"
  ["project_narrative_summary"]=>
  string(3487) "Treatments for rare diseases often struggle to run the gold standard clinical trial methodology, randomized control trials (RCTs).  This is due to a lack of participants available for a well-powered comparison between experimental and control arms together with ethical restrictions assigning patients to control arms (Thorlund et al., 2020).  

Synthetic control arms are control groups generated based on real-world patient data with similar attributes to the experimental group (Bouttell et al., 2018).  They are typically designed based on previous RCT data, observational study data, or external data (e.g. electronic health records) (Thorlund et al., 2020).  Synthetic control arms are particularly useful in clinical trials  that would otherwise be restricted by participant recruitment, cost, or ethics.  Several previous clinical trial studies have utilized synthetic controls successfully (Berry et al., 2017; Blondeau, Schneider and Ngwa, 2020; Ko et al., 2021). The FDA (U.S. Food and Drug Administration) has approved drug RCTs that utilized synthetic control arms in recent years (Goldsack, 2019; Commissioner, 2020; Gretton, 2021).  Using synthetic control arms for rare disease RCTs would address issues of lack of participants and ethical restrictions, however there is often no previous data to help generate synthetic controls from (Prasad, 2021).  

The goal of this study is to create a methodology that can be used to generate pools of synthetic controls for rare diseases by training a machine learning algorithm to predict control arms from experimental arms of similar studies.

The first aim of the study looks at the three ways of generating synthetic controls (using previous RCT data, observational study data, or external data) to determine the difference in accuracy between them.  Previous work has highlighted likely differences in the quality of these methods (Thorlund et al., 2020), but this has yet to be quantified using real world data.  Historical RCTs with both an experimental and control arm will be used for this analysis.  Synthetic control arms will be generated using each of the three methods, and compared to the real control arm used in the studies.  The difference in accuracy, correlation, and bias will be calculated for each method.  The purpose of this is to understand how much data quality will be lost when using a non-optimal data source; if the data quality loss is minimal, this study will proceed using an expanded criteria for data sources.  

The next aim uses previous RCT summary level data to train a machine learning model that predicts control arms from experimental arms.  Using the software Kerus (Flynn, 2015), simulation datasets based on summary level data can be generated for the purpose of training (McCartan et al., 2021).  The use of simulation data is necessary, as this model will likely require a large amount of data from a variety of RCTs.  This model will be validated and tested on with historical RCT data. 

Using this model, experimental arms matched by similarity to the rare disease can be fed in to predict an accurate control arm.  Similarity in this instance refers to trials matched on the genotype and symptoms of the target disease, and/or characteristics of intended treatment group.

If successful, this model will provide a new method of generating synthetic controls for rare disease RCTs where there is currently no other method of doing so.

"
  ["project_learn_source"]=>
  string(9) "colleague"
  ["principal_investigator"]=>
  array(7) {
    ["first_name"]=>
    string(6) "Nicole"
    ["last_name"]=>
    string(9) "Cizauskas"
    ["degree"]=>
    string(78) "MSc in Health Data Analytics and Machine Learning from Imperial College London"
    ["primary_affiliation"]=>
    string(34) "Newcastle University (PhD student)"
    ["email"]=>
    string(28) "n.cizauskas2@newcastle.ac.uk"
    ["state_or_province"]=>
    string(19) "Newcastle-Upon-Tyne"
    ["country"]=>
    string(14) "United Kingdom"
  }
  ["project_key_personnel"]=>
  bool(false)
  ["project_ext_grants"]=>
  array(2) {
    ["value"]=>
    string(3) "yes"
    ["label"]=>
    string(65) "External grants or funds are being used to support this research."
  }
  ["project_funding_source"]=>
  string(55) "MRC-NIHR Trials Methodology Research Partnership (TMRP)"
  ["project_date_type"]=>
  string(18) "full_crs_supp_docs"
  ["property_scientific_abstract"]=>
  string(2527) "1. Background

It is often difficult to execute a RCT for a rare disease treatment due to lack of participants, ethics, and cost  (Thorlund et al., 2020).  Synthetic control arms could potentially be used in place of placebo or control arms in these RCTs.  



2. Objective

There are two aims of this study: first, to determine which types of historical data are acceptable in generating synthetic controls and what the difference in accuracy is between the methods, and second, to create a machine learning model that can predict control arms given historical experimental arms.



3.  Study Design

This is a methdological study with three parts. 



4. Participants

For the first aim, historical RCT trials with IPD (individual participant data) will be used.  Separate synthetic control arms will be generated based on three different types of historical data (previous RCTs, observational study data, and external data) (external data, observational studies, and previous RCTs) and compared to the real historical control arm. For the second aim, simulated datasets of control arms and experimental arms based on publicly available summary level RCT data will be used to train the machine learning model.  Historical RCTs will also be recruited from all available sources for the testing of the model.



5. Primary/Secondary Outcome Measure(s)

This project is focused on developing a methodology. The use of RCT data is to ensure that the methodology works on real RCT data in practice.  As such, there is not primary and secondary outcomes.  The RCT data can contain any combination of primary or secondary outcomes: what is relevant for the scope of this project is the demographic information (sex, ethnicity, age, e.t.c.) and the arm assigned (control or experimental).  Any publications would report summary level statistics of the demographic information and arm assignment.



6. Statistical Analysis

In the first aim, existing packages will be used to generate synthetic controls from previous RCTs, observational studies, and external data.  Synthetic controls will be compared to historical control arms and experimental arms using Pearson’s correlation coefficient. In the second aim, a generative adversarial network (GAN) deep learning model will be used to generate control data from input dataset.  The generated data will be compared to the test data using Pearson’s correlation coefficient.  

"
  ["project_brief_bg"]=>
  string(2380) "It is often difficult to execute a RCT for a rare disease treatment due to lack of participants, ethics, and cost  (Thorlund et al., 2020).  Synthetic control arms could potentially be used in place of placebo or control arms in these RCTs.  

Synthetic controls have been successful in historical trials. One phase 1-2 trial looking at establishing novel indicators of survival in acute myeloid leukaemia used a data pool of historical controls from Medidata’s archive of trial data (Berry et al., 2017); this study was able to analyse its primary outcomes of complete remission, complete remission without hematologic recovery, and overall survival using their single-arm trial combined with a synthetic control arm. 

Another previous study used observational data to generate a synthetic control arm matched to a clinical trial population (Blondeau, Schneider and Ngwa, 2020).  Propensity scores were used to match participants in the experimental arm to controls in PharMetrics, a US claims database.  A sufficient number of matched participants were selected to allow a well-powered comparison. 

A recent study focused on using Electronic Health Records (EHRs) to develop a synthetic control arm (Ko et al., 2021); this study looked at the effect of a lifestyle intervention on cardiovascular health metrics, and use propensity scores to match controls from EHRs to participants in a single-arm trial.  The use of EHRs allowed for a follow-up on the same control arm participants 5 years later.  Overall, external data from EHRs had mixed reception, with some measurements being more useful than others in analysis.  This method is thought to be more prone to bias than using RCT or prospective observational data.

The use of synthetic control arms in RCT is gaining more reception, with recent approvals from the FDA featuring synthetic controls in their analyses (Goldsack, 2019; Commissioner, 2020; Gretton, 2021).  However, it is still difficult to provide a synthetic control arm for rare disease RCTs, as there is a lack of previous RCT, observational, and external data (Prasad, 2021).  This project aims to fill that gap by developing a methodology for rare disease single-arm trials to generate a synthetic control arm using machine learning algorithms training on predicting control arms from experimental arms in previous RCTs.

"
  ["project_specific_aims"]=>
  string(1043) "Aim 1: Determine which of current three synthetic control arm methods, using previous RCT data, observational data, or external data, are viable for creating RCT controls

Objectives:

•	Assess which of the three methods result in statistically indistinguishable controls

•	Compare the bias of any successful methods

•	Compare the accessibility and ease of access of any successful methods

Hypothesis:

•	Synthetic controls created from previous RCT data will have significantly higher accuracy compared to the real control arm than the other methods.

Aim 2: Generate control arms using ML/DL methods by training on previous, related RCT data

Objectives:

•	Create a ML model that predicts control arms from experimental groups

•	Test and validate the model

•	Use this model to create RCT control libraries for rare diseases

Hypothesis:

•	A ML model can generate statistically indistinguishable control arms from real control arms. 

"
  ["project_study_design"]=>
  array(2) {
    ["value"]=>
    string(8) "meth_res"
    ["label"]=>
    string(23) "Methodological research"
  }
  ["project_purposes"]=>
  array(2) {
    [0]=>
    array(2) {
      ["value"]=>
      string(37) "develop_or_refine_statistical_methods"
      ["label"]=>
      string(37) "Develop or refine statistical methods"
    }
    [1]=>
    array(2) {
      ["value"]=>
      string(34) "research_on_clinical_trial_methods"
      ["label"]=>
      string(34) "Research on clinical trial methods"
    }
  }
  ["project_software_used"]=>
  array(2) {
    ["value"]=>
    string(6) "python"
    ["label"]=>
    string(6) "Python"
  }
  ["project_research_methods"]=>
  string(639) "This project is focused on developing a methodology. The use of RCT data is to ensure that the methodology works on real RCT data in practice.  As such, there is not explicit inclusion/exclusion criteria at the patient level.  However, there is such at the dataset level.  The below criteria is therefore measured at the dataset level, not the participant level.

Inclusion: RCT datasets with separate experimental and control arms; RCT datasets related to drugs/diseases that have multiple available RCT study datasets to compare to

Exclusion: Patients who dropped out partway (only complete cases are taken).



"
  ["project_main_outcome_measure"]=>
  string(536) "This project is focused on developing a methodology. The use of RCT data is to ensure that the methodology works on real RCT data in practice.  As such, there is not primary and secondary outcomes.  The RCT data can contain any combination of primary or secondary outcomes: what is relevant for the scope of this project is the demographic information (sex, ethnicity, age, e.t.c.) and the arm assigned (control or experimental).  Any publications would report summary level statistics of the demographic information and arm assignment."
  ["project_main_predictor_indep"]=>
  string(538) "Aim 1: Comparing the accuracy of different methods for generating synthetic controls

•	Independent variable: type of data used in synthetic control generation

•	Dependent variable: accuracy and correlation of the synthetic control to the actual control

Aim 2: Creating a ML model to predict control arms from experimental arms

•	Independent variable: training data used/model specifications such as epoch length, batch size, loss function

•	Dependent variable: ML model’s accuracy/bias

"
  ["project_other_variables_interest"]=>
  string(442) "The control arms will be compared based on a number of common demographic information, such as sex, ethnicity, age, and previous health conditions where appliable.  

Relative change (as a percentage) from baseline will be used to access the outcome.  This measurement was chosen as it can reflect magnitude without units, and so the model can accurately understand data from studies with different outcome measurements.



"
  ["project_stat_analysis_plan"]=>
  string(2279) "The requested clinical data from YODA will be used in both aim 1 and aim 2 of this study.  The programming languages R and Python will be used to complete this analysis, likely in the programs R Studio and Jupyter Lab respectively.

In aim 1, key characteristics (sex, ethnicity, age) in selected YODA trials will be used to generate synthetic controls.  Synthetic controls will be made using the R packages Tidysynth (Dunford, 2023) and Scpi (Cattaneo et al., 2022).  Across all trials, the average outcomes in synthetic controls and actual control arms will be compared using Pearson’s Correlation Coefficient.  For this analysis, RCT studies need to be paired with other RCTs, observational studies, and external data for similar drugs/diseases.  

In aim 2, RCT data from YODA will be used in the testing of a GAN (generative adversarial network) deep learning model training on a combination of simulated datasets and real world RCT datasets. GAN models are made of two components: a generator and a discriminator (Goodfellow et al., 2020; Arora and Arora, 2022).  They work by generating a random sequence and using the discriminator to compare this to the chosen input.  The model compares the generated data to the input data and then repeats the process while trying to improve the similarity. This can run for any epochs until the model can successfully create generated data that is similar in key properties to the input data. In the test set, experimental or single arms will be used. This synthetic control arm will be compared to the trial control or placebo arm and the experimental arm using Pearson’s correlation coefficient.  In order to input the data into the GAN model, the data must be cleaned and one-hot-encoded to appear in numerical form.  Demographic data and relative change from baseline are the two key categories of data being looked at.

Examples of the data cleaning process and GAN modelling can be found on an example dataset in the Github repository linked below:

(link to data cleaning procedure and example GAN model:

 https://github.com/N-cizauskas/GAN-for-Synthetic-Controls)



Rare disease data will be obtained later in the project and tested on an improved version of the model.

"
  ["project_timeline"]=>
  string(254) "I plan to complete Aim 1 within 12 months of receiving the data.  The duration of Aim 2 is dependent on how long it takes to acquire the other necessary datasets, specifically those for training the machine learning algorithm.  This may exceed 12 months."
  ["project_dissemination_plan"]=>
  string(454) "Project results will be disseminated via journal publication and at conference presentations.  Potential journals include:

•	Potential conferences include: PSI (Statisticians in the Pharmaceutical Industry), ICTMC (International Clinical Trials Methodology Conference), and others

•	Potential journals include: Pharmaceutical Statistics Journal, Contemporary Clinical Trials, International Journal of Clinical Trials, and others

"
  ["project_bibliography"]=>
  string(3843) "
Arora, Anmol and Arora, Ananya (2022) ‘Generative adversarial networks and synthetic patient data: current challenges and future perspectives’, Future Healthc J, 9(2), pp. 190–193. Available at: https://doi.org/10.7861/fhj.2022-0013.
Berry, D.A. et al. (2017) ‘Creating a synthetic control arm from previous clinical trials: Application to establishing early end points as indicators of overall survival in acute myeloid leukemia (AML).’, Journal of Clinical Oncology, 35(15_suppl), pp. 7021–7021. Available at: https://doi.org/10.1200/JCO.2017.35.15_suppl.7021.
Blondeau, K., Schneider, A. and Ngwa, I. (2020) ‘A synthetic control arm from observational data to estimate the background incidence rate of an adverse event in patients with Alzheimer’s disease matched to a clinical trial population’, Alzheimer’s & Dementia, 16(S10), p. e043657. Available at: https://doi.org/10.1002/alz.043657.
Bouttell, J. et al. (2018) ‘Synthetic control methodology as a tool for evaluating population-level health interventions’, J Epidemiol Community Health, 72(8), pp. 673–678. Available at: https://doi.org/10.1136/jech-2017-210106.
Cattaneo, M.D. et al. (2022) ‘scpi: Uncertainty Quantification for Synthetic Control Methods’. arXiv. Available at: https://doi.org/10.48550/arXiv.2202.05984.
Commissioner, O. of the (2020) Statement from FDA Commissioner Scott Gottlieb, M.D., on FDA’s new strategic framework to advance use of real-world evidence to support development of drugs and biologics, FDA. FDA. Available at: https://www.fda.gov/news-events/press-announcements/statement-fda-commissioner-scott-gottlieb-md-fdas-new-strategic-framework-advance-use-real-world (Accessed: 2 October 2023).
Dunford, E. (2023) ‘tidysynth: A Tidy Implementation of the Synthetic Control Method’. Available at: https://cran.r-project.org/web/packages/tidysynth/index.html (Accessed: 19 October 2023).
Flynn, A. (2015) ‘Exploristics’, Personalized Medicine, 12(6), pp. 537–540. Available at: https://doi.org/10.2217/pme.15.32.
Goldsack, J. (2019) ‘Synthetic control arms can save time and money in clinical trials’, STAT, 5 February. Available at: https://www.statnews.com/2019/02/05/synthetic-control-arms-clinical-trials/ (Accessed: 2 October 2023).
Goodfellow, I. et al. (2020) ‘Generative adversarial networks’, Communications of the ACM, 63(11), pp. 139–144. Available at: https://doi.org/10.1145/3422622.
Gretton, C. (2021) Synthetic Control Arms: A Broader Clinical reach, PharmaVoice. Available at: https://www.pharmavoice.com/news/2021-10-synthetic-control-arms-a-broader-clinical-reach/612010/ (Accessed: 2 October 2023).
Ko, Y.-A. et al. (2021) ‘Developing a synthetic control group using electronic health records: Application to a single-arm lifestyle intervention study’, Preventive Medicine Reports, 24, p. 101572. Available at: https://doi.org/10.1016/j.pmedr.2021.101572.
McCartan, S. et al. (2021) ‘A comparison of individual participant data (IPD) and summary data to inform clinical trial simulation’.
Prasad, V. (2021) ‘Reliable, cheap, fast and few: What is the best study for assessing medical practices? Randomized controlled trials or synthetic control arms?’, European Journal of Clinical Investigation, 51(8), p. e13580. Available at: https://doi.org/10.1111/eci.13580.
Thorlund, K. et al. (2020) ‘Synthetic and External Controls in Clinical Trials – A Primer for Researchers’, Clinical Epidemiology, 12, pp. 457–467. Available at: https://doi.org/10.2147/CLEP.S242097.
"
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  string(4) "2024"
  ["project_rep_publ"]=>
  bool(false)
  ["project_assoc_data"]=>
  array(0) {
  }
  ["project_due_dil_assessment"]=>
  array(21) {
    ["ID"]=>
    int(14455)
    ["id"]=>
    int(14455)
    ["title"]=>
    string(47) "YODA Project Due Diligence Assessment 2024-0060"
    ["filename"]=>
    string(51) "YODA-Project-Due-Diligence-Assessment-2024-0060.pdf"
    ["filesize"]=>
    int(117634)
    ["url"]=>
    string(100) "https://yoda.yale.edu/wp-content/uploads/2024/01/YODA-Project-Due-Diligence-Assessment-2024-0060.pdf"
    ["link"]=>
    string(93) "https://yoda.yale.edu/data-request/2024-0060/yoda-project-due-diligence-assessment-2024-0060/"
    ["alt"]=>
    string(0) ""
    ["author"]=>
    string(3) "190"
    ["description"]=>
    string(0) ""
    ["caption"]=>
    string(0) ""
    ["name"]=>
    string(47) "yoda-project-due-diligence-assessment-2024-0060"
    ["status"]=>
    string(7) "inherit"
    ["uploaded_to"]=>
    int(13980)
    ["date"]=>
    string(19) "2024-04-01 18:15:06"
    ["modified"]=>
    string(19) "2024-04-01 18:15:06"
    ["menu_order"]=>
    int(0)
    ["mime_type"]=>
    string(15) "application/pdf"
    ["type"]=>
    string(11) "application"
    ["subtype"]=>
    string(3) "pdf"
    ["icon"]=>
    string(62) "https://yoda.yale.edu/wp/wp-includes/images/media/document.png"
  }
  ["project_title_link"]=>
  array(21) {
    ["ID"]=>
    int(14456)
    ["id"]=>
    int(14456)
    ["title"]=>
    string(42) "YODA Project Protocol 2024-0060 - 24-01-22"
    ["filename"]=>
    string(44) "YODA-Project-Protocol-2024-0060-24-01-22.pdf"
    ["filesize"]=>
    int(191065)
    ["url"]=>
    string(93) "https://yoda.yale.edu/wp-content/uploads/2024/01/YODA-Project-Protocol-2024-0060-24-01-22.pdf"
    ["link"]=>
    string(86) "https://yoda.yale.edu/data-request/2024-0060/yoda-project-protocol-2024-0060-24-01-22/"
    ["alt"]=>
    string(0) ""
    ["author"]=>
    string(3) "190"
    ["description"]=>
    string(0) ""
    ["caption"]=>
    string(0) ""
    ["name"]=>
    string(40) "yoda-project-protocol-2024-0060-24-01-22"
    ["status"]=>
    string(7) "inherit"
    ["uploaded_to"]=>
    int(13980)
    ["date"]=>
    string(19) "2024-04-01 18:15:28"
    ["modified"]=>
    string(19) "2024-04-01 18:15:28"
    ["menu_order"]=>
    int(0)
    ["mime_type"]=>
    string(15) "application/pdf"
    ["type"]=>
    string(11) "application"
    ["subtype"]=>
    string(3) "pdf"
    ["icon"]=>
    string(62) "https://yoda.yale.edu/wp/wp-includes/images/media/document.png"
  }
  ["project_review_link"]=>
  array(21) {
    ["ID"]=>
    int(14457)
    ["id"]=>
    int(14457)
    ["title"]=>
    string(36) "YODA Project Review - 2024-0060_site"
    ["filename"]=>
    string(38) "YODA-Project-Review-2024-0060_site.pdf"
    ["filesize"]=>
    int(494682)
    ["url"]=>
    string(87) "https://yoda.yale.edu/wp-content/uploads/2024/01/YODA-Project-Review-2024-0060_site.pdf"
    ["link"]=>
    string(80) "https://yoda.yale.edu/data-request/2024-0060/yoda-project-review-2024-0060_site/"
    ["alt"]=>
    string(0) ""
    ["author"]=>
    string(3) "190"
    ["description"]=>
    string(0) ""
    ["caption"]=>
    string(0) ""
    ["name"]=>
    string(34) "yoda-project-review-2024-0060_site"
    ["status"]=>
    string(7) "inherit"
    ["uploaded_to"]=>
    int(13980)
    ["date"]=>
    string(19) "2024-04-01 18:15:56"
    ["modified"]=>
    string(19) "2024-04-01 18:15:56"
    ["menu_order"]=>
    int(0)
    ["mime_type"]=>
    string(15) "application/pdf"
    ["type"]=>
    string(11) "application"
    ["subtype"]=>
    string(3) "pdf"
    ["icon"]=>
    string(62) "https://yoda.yale.edu/wp/wp-includes/images/media/document.png"
  }
  ["project_highlight_button"]=>
  string(0) ""
  ["request_data_partner"]=>
  string(15) "johnson-johnson"
  ["request_overridden_res"]=>
  string(1) "3"
}
data partner
array(1) {
  [0]=>
  string(15) "johnson-johnson"
}


pi country
array(0) {
}


pi affil
array(0) {
}


products
array(4) {
  [0]=>
  string(6) "zytiga"
  [1]=>
  string(8) "invokana"
  [2]=>
  string(6) "invega"
  [3]=>
  string(15) "invega-sustenna"
}


num of trials
array(1) {
  [0]=>
  string(2) "14"
}


res
array(1) {
  [0]=>
  string(1) "3"
}