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  string(90) "Development and applications of new safety analysis methods for randomized clinical trials"
  ["project_narrative_summary"]=>
  string(692) "Drug safety is an important issue. Important safety analysis questions include: (a) safety signal detection: to identify safety issues worthy further exploration, (b) subgroup analysis: to identify subjects vulnerable to certain safety issues, (c) benefit-risk analysis.

We have developed a series of new analytical approaches to tackle well-known challenges including (1) high dimensional, (2) rare occurrence, and (3) weak signal . In this project, we will (1) apply these approaches to detect safety signals of different drugs based on drug clinical trial data, and

(2) develop and test subgroup analyses approaches to identify subgroups with different benefit-risk profiles."
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      ["p_pers_f_name"]=>
      string(7) "Bingxin"
      ["p_pers_l_name"]=>
      string(4) "Zhao"
      ["p_pers_degree"]=>
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      ["p_pers_pr_affil"]=>
      string(47) "Department of Biostatistics, UNC at Chapel Hill"
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      string(6) "Xifeng"
      ["p_pers_l_name"]=>
      string(4) "Wang"
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      string(47) "Department of Biostatistics, UNC at Chapel Hill"
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    ["label"]=>
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      string(233) "NCT00638690 - A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of Abiraterone Acetate (CB7630) Plus Prednisone in Patients With Metastatic Castration-Resistant Prostate Cancer Who Have Failed Docetaxel-Based Chemotherapy"
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      string(223) "NCT00887198 - A Phase 3, Randomized, Double-blind, Placebo-Controlled Study of Abiraterone Acetate (CB7630) Plus Prednisone in Asymptomatic or Mildly Symptomatic Patients With Metastatic Castration-Resistant Prostate Cancer"
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  ["project_date_type"]=>
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  ["property_scientific_abstract"]=>
  string(1554) "Background: Drug safety has always been a major medical concern, and adverse drug events are associated with cost of multi billions annually to the health delivery system. Yet, current practice of safety analyses in clinical trials are at most descriptive, featuring a long list, running possibly hundreds of pages, of observed adverse events (AEs) grouped by treatment arms, and relying on ocular investigation.An urgent need exists for the development of advanced approaches, which could be formally incorporated in the design and analysis of clinical trials, including cancer clinical trials, for safety evaluation.

Objective: Our primary objective is to apply several powerful safety signal detection approaches to existing drug trial data. Secondary objectives include developing and applying subgroup analysis approaches to identify subgroups with different benefit-risk profiles.

Study Design: It is a secondary data analysis project.

Participants: Our analysis will include all subjects available from these data sets we have applied for access. Analyses will be conducted separately for each trial, or on combined trial data if same drug was tested in different trials.

Main Outcome Measure: The primary endpoint will be safety outcome (incidence of AEs) for the first objective (safety signal detection). Efficacy outcomes will be added for the secondary.

Statistical Analysis: The primary endpoint will be analyzed using a hierarchical testing approach.  We will develop new approaches for subgroup analyses."
  ["project_brief_bg"]=>
  string(3124) "Safety issues of a drug can include occurrence of specific AEs as well as clinically significant lab tests or other safety-related measurements. The safety of marketed drugs has become a public concern since the Elixir Sulfanilamide disaster in late 1930s which led to the Federal Food, Drug and Cosmetic Act (FD&C Act) (1938), and then Kefauver-Harris Drug Amendments (1962) as a response to the Thalidomide tragedy. The past decades have seen numerous regulatory guidance documents issued to enhance drug safety evaluation by both national and international organizations like International Conference on Harmonisation (ICH)1, Council for International Organizations of Medical Sciences (CIOMS)2, Food and Drug Administration (FDA)3, European Commission (EC)4.

Safety assessment is thus critically important in drug development. Astonishingly contrary to this importance is a lack of well-accepted, and statistically sound safety assessment approach in clinical trials, due to several statistical challenges including multiplicity, rare events, and weak signal. Current popular practice of safety analysis only involves descriptive statistics, ending with a lengthy, but arguably useless report of frequencies of all observed safety issues during the study period of a clinical trial. Failure to adjust for multiplicity increases the risk of false positives, while an overly stringent adjustment can result in false negatives, a real troublesome issue from a product-consumer perspective. The fact that most trials are designed based on efficacy endpoints and may have limited power to detect safety signals makes the situation even worse. 

On the other hand, around 50% new drug failed at Phase III, posing great financial burdens to drug developers. In addition, even for approved drug, the existence of population heterogeneity largely implies sub-optimal use of drugs. Advanced subgroup analysis, through identifying sub-population who could benefit more from a drug with acceptable side effects, could re-vitalize failed drugs and lead to more precise use of approved drugs. 

The proposed research is significant for its potential to greatly enhance current safety evaluation practice in drug development. Current frequentist approaches in this area have overly focused on multiplicity using different false discovery rate control methods5, but leaves the issues of rare events and weak signal largely untouched. The project will show that a new frequentist approach framework, which implicitly accounts for correlated AEs, together with classical false discovery rate control methods, could well tackle the safety evaluation challenges. In addition, more advanced subgroups analyses approach with emphasis on latent population heterogeneity could lead to re-activation of ?dead? drugs and optimal use of approved drugs. This could eventually lead a well-established safety evaluation and subgroup analyses framework for in drug trials, and, through preventing approval of unsafe drug, minimizing preventable cost, caused by drug safety issue, to public, government, and pharmatheutical industry."
  ["project_specific_aims"]=>
  string(923) "We hypothesize that our new safety signal detection approach have increased power of identify safety signals at both SOC level and AE level comparing to currently available safety signal detection approaches like double false discovery rate (FDR).

Primary specific aim / objective:

1. To identify system organ class (SOCs) and individual AEs which show statistically significant difference between treatment arms, with appropriate control of type I error.

Secondary specific aims / objectives:

1. To develop new subgroup analysis approaches to account for both safety and efficacy outcomes.

2. To apply the subgroup analysis approaches to identify subgroups subgroups who are vulnerable to certain AEs, and subgroups who might benefit from a study drug without excessive toxicity.

3. To generalize the above approaches to analyze data pooled from different trials on the same drug."
  ["project_study_design"]=>
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  string(1246) "We will employ a post-hoc analysis of the COU-AA-301/302 data to compare the joint distribution of safety outcomes between treatment arms to identify safety signals. Our primary endpoint is the multivariate safety outcomes observed in a trial, and our secondary outcome will add efficacy outcomes.

All patients treated on the COU-AA-301/302 trial will be eligible for this analysis. Requested Data:

Demographic information

-Age

-Race

-Gleason Score

-Date of Diagnosis

-Prior anti-cancer therapies

-Prior prostatectomy and/or radiation therapy

-Investigations (PSA, Hgb, Cr, AlkPhos, LDH)

-Pain score

-Performance Status

-Cohort

-#cycles

-Mode of progression

-Best PSA response

-CTCAE (grades of all experienced adverse events)

-Date of initiation

-Date of PSA progression (PSA progression-free survival)

-Date of Radiographic PFS (Radiographic progression-free survival)

-Date of death (overall survival)

-CT and NM Bone scan description of metastatic disease at baselin (# bone, nodal, visceral)

-CT and NM Bone scan description of metastatic disease at progression (# bone, nodal, visceral)"
  ["project_main_outcome_measure"]=>
  string(228) "The primary endpoint is the highest grade experienced per subject per AE, for all observed AEs. Efficacy outcomes like time of disease progression, overall survival will be considered as secondary outcomes for subgroup analyses."
  ["project_main_predictor_indep"]=>
  string(130) "The primary independent variable will be assigned study treatment (abiraterone versus placebo). It is assigned per study protocol."
  ["project_other_variables_interest"]=>
  string(1274) "Age at study entry (years)

Race (Am. Indian, Asian, Black , Native Hawaiian or Other Pacific Islander, White)

Gleason Score (sum)

Date of Diagnosis

Prior anti-cancer therapies (number of prior hormonal therapies, prior ketoconazole, prior chemotherapies)

Prior prostatectomy and/or radiation therapy (Y/N for each)

Investigations (PSA, Hgb, Cr, AlkPhos, LDH)

Pain score / presence of pain (binary Y/N)

Performance Status (ECOG)

Cohort (Abiraterone or Placebo)

# cycles administered / duration of exposure to agent (in # of cycles)

Mode of progression (clinical, radiographic, toxicity)

Best PSA response (% reduction)

Date of Abiraterone or Prednisone initiation

Date of PSA progression (PSA progression-free survival)

Date of Radiographic PFS (Radiographic progression-free survival)

Number of bone mets at baseline

Number of nodal mets at baseline

Number of visceral mets (liver, lung, other) at baseline

Number of bone mets at progression ? and if progression in bone

Number of nodal mets at progression ? and if progression in node

Number of visceral mets (liver, lung, other) at progression ? and if progression in viscera"
  ["project_stat_analysis_plan"]=>
  string(1446) "Disease characteristics will be compared using descriptive statistics and t-tests. Difference in safety profile between treatment arms per SOC will be tested using a newly developed score-test approach, based on an inverse logistic regression model in which AEs from the same SOC are treated as X-covariates and treatment assignment as the Y-covariate.  This score-base test is intended to test whether the joint distribution of AEs is the same across different treatment groups.  Difference in incidence of individual AEs between treatment arms will be conducted using Fisher?s exact test, adjusted for multiplicity using a hierarchical testing approach.  Other safety signal detection approaches like DFDR, Benjamini-Hochberg (BH) will also be applied (to both real and simulated data) and compared with our approach, in terms of number of true/false safety signals identified. 

Subgroup analysis will be based on new approaches to be developed. Specifically, we pan to first apply tree-based approaches (e.g., decision tree, random forest) to build classification/regression trees for safety and efficacy outcomes, so as to identify potential subgroups with outstanding safety/efficacy profiles. We also plan to extend current tree-based approaches to handle potential issues like latent heterogeneity in study population, e.g., there could exist  unobserved (latent) factors contributing to the definition of safety/efficacy subgroups."
  ["project_timeline"]=>
  string(146) "Project start date: 7/2018

Analysis completion date: 7/2019

Date manuscript drafted/submitted: 7/2020

Results reported 7/2020"
  ["project_dissemination_plan"]=>
  string(148) "Anticipate presentation of data at JSM 2019 or JSM 2020, with manuscript publication in Statistics in Medicine, Clincial Trials, or similar journal."
  ["project_bibliography"]=>
  string(949) "
1. http://www.ich.org/products/guidelines/safety/article/safety-guidelines….

2. http://www.cioms.ch/publications/blurbs/management_of_safety_information…

3. http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformati…

4. http://ec.europa.eu/health/files/eudralex/vol-10/2011_c172_01/2011_c172_…

5. Mehrotra DV1, Adewale AJ. Flagging clinical adverse experiences: reducing false discoveries without materially compromising power for detecting true signals. Stat Med. 2012 Aug 15;31(18):1918-30. doi: 10.1002/sim.5310.

6. Sun, J., Zheng, Y., and Hsu, L. (2013) A Unified Mixed-Effects Model for Rare-Variant Association in Sequencing Studies. Genet Epidemiol. 2013 Mar 9. doi: 10.1002/gepi.21717

7. Wu MC, Lee S, Cai T, Li Y, Boehnke M, Lin X. Rare variant association testing for sequencing data with the sequence kernel association test. Am J Hum Genet. 2011;89:82?93.
"
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    string(89) "https://yoda.yale.edu/wp-content/uploads/2023/08/yoda_project_review_-_2018-2801_site.pdf"
    ["link"]=>
    string(82) "https://yoda.yale.edu/data-request/2018-2801/yoda_project_review_-_2018-2801_site/"
    ["alt"]=>
    string(0) ""
    ["author"]=>
    string(4) "1363"
    ["description"]=>
    string(0) ""
    ["caption"]=>
    string(0) ""
    ["name"]=>
    string(36) "yoda_project_review_-_2018-2801_site"
    ["status"]=>
    string(7) "inherit"
    ["uploaded_to"]=>
    int(4335)
    ["date"]=>
    string(19) "2023-08-09 17:09:25"
    ["modified"]=>
    string(19) "2023-08-09 19:21:21"
    ["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"
  ["search_order"]=>
  string(5) "-9050"
  ["request_overridden_res"]=>
  string(1) "2"
}
data partner
array(1) {
  [0]=>
  string(15) "johnson-johnson"
}


pi country
array(1) {
  [0]=>
  string(13) "United States"
}


pi affil
array(1) {
  [0]=>
  string(8) "Academia"
}


products
array(1) {
  [0]=>
  string(6) "zytiga"
}


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


res
array(1) {
  [0]=>
  string(1) "2"
}