Transplant Research for Enhancing Access Team (TREAT)

The Transplant Research for Enhancing Access Team (TREAT) is a multidisciplinary collaborative team of clinicians, biostatisticians, epidemiologists, behavioral scientists, and data scientists from the Regenstrief Institute, Indiana University, and Emory School of Medicine’s Department of Surgery. TREAT has two main areas of research interest, including one in 1) transplant health services and outcomes research, and one more broad interest in 2) supporting health services research in general through our collaborative work across various institutions and organizations.

members of the TREAT team at a retreat in 2025Our Mission

The main mission of TREAT is to improve access to each step of the transplant process. We study how people move through each step, identify structural and social barriers, and translate high‑quality data into tools, interventions, and policies that support patients, providers, health systems, and communities.

Our Core Strategic Goals

  • Leading Data Infrastructure: Establishing TREAT as the national and international leader for pre-waitlisting data, measurement, and quality reporting through the Early Steps to Transplant Access Registry (E-STAR) and related analytic infrastructure.
  • Rigorous Discovery: Using mixed-methods research to pinpoint patient-, provider-, system-, and policy-level barriers and facilitators to transplant access.
  • Intervention & Implementation: Developing and testing the efficacy of scalable, sustainable interventions to reduce disparities that are informed by community engagement and data.
  • Policy & Metrics: Designing quality metrics for dialysis facilities and transplant centers that prioritize and incentivize patient access.
  • Community Partnership: Cultivating deep, sustained engagement with patients, communities, health systems, and industry partners to ensure our research and findings translate into real-world change.

Collaboration & Dissemination

Fundamental to our success is our commitment to partnership. We cultivate long-term relationships with patients, industry leaders, and the scientific community. By communicating our research findings to the scientific community (e.g., via peer-reviewed publications) and to patients, the community, and the public (e.g., via community-based meetings such as the Southeastern Kidney Transplant Coalition and Ohio River Valley Transplant Coalition), we aim to transform the transplant landscape for good.

E-STAR logo Helpful Links:
E-STAR Website
E-STAR dashboard
Transplant Referral Maps

Partner Organizations

Island Peer Review Organization logo
Regenstrief Institute
Regenstrief Institute
Emory University logo
Indiana University Health logo
Regenstrief Institute
Ohio River Valley Transplant Coalition logo

Project Team

Rachel Patzer, PhD, MPH Rachel Patzer, PhD, MPH

Rachel Patzer, PhD, MPH

Director of TREAT
President & CEO and Research Scientist, Regenstrief Institute
Leonard Betley Professor of Medicine, IU School of Medicine
Professor, IU Fairbanks School of Public Health

Katie Ross-Driscoll, PhD, MPH Katie Ross-Driscoll, PhD, MPH

Katie Ross-Driscoll, PhD, MPH

Research Scientist, Regenstrief Institute
Assistant Professor, Department of Surgery, Indiana University School of Medicine

Adam S. Wilk, PhD Adam S. Wilk, PhD

Adam S. Wilk, PhD

Deputy Director of TREAT
Associate Professor of Surgery, IU School of Medicine
Research Scientist, Regenstrief Institute

Jade Buford Jade Buford

Jade Buford, MPH

Epidemiologist, Regenstrief Institute

Kelsey Drewry, PhD, MA Kelsey Drewry, PhD, MA

Kelsey Drewry, PhD, M.A.

Assistant Professor of Surgery, IU School of Medicine
Research Scientist, William M. Tierney Center for Health Services Research, Regenstrief Institute

Mengyu Di Mengyu Di

Mengyu Di, MSPH

Data Scientist, Regenstrief Institute

Kristopher Huffman Kristopher Huffman

Kristopher Huffman, MS

Data Scientist, Regenstrief Institute

Marciana Laster, MD Marciana Laster, MD

Marci Laster, M.D.

Physician, Riley Pediatric Nephrology & Kidney Diseases
Assistant Professor of Clinical Pediatrics, IU School of Medicine

Neha Pottanat, MD Neha Pottanat, MD

Neha D. Pottanat, M.D.

Physician, Riley Pediatric Nephrology & Kidney Diseases
Assistant Professor of Clinical Pediatrics, IU School of Medicine

Angelitta M. Britt-Spells, PhD Angelitta M. Britt-Spells, PhD

Angelitta M. Britt-Spells, PhD

Assistant Professor in Epidemiology, IU Richard M. Fairbanks School of Public Health
Affiliate Scientist, Regenstrief Institute

Joshua Sadowski Joshua Sadowski

Josh Sadowski, MPH

PhD Candidate in Epidemiology at Richard M. Fairbanks School of Public Health
Senior Data Analyst, IU Health

Sarah E. Huber, MD Sarah E. Huber, MD

Sarah E. Huber, M.D.

Resident Appointee, IU School of Medicine

Sih-Ting Cai, PhD Sih-Ting Cai, PhD

Sih-Ting Cai, PhD, MPA

Postdoctoral Fellow, O’Neill School of Public & Environmental Affairs, IU Bloomington

Stephen Pastan, MD Stephen Pastan, MD

Stephen Pastan, M.D.

Medical Director, Emory Kidney and Pancreas Transplant Center Nephrologist, Emory Transplant Center
Professor of Medicine, Emory University School of Medicine

Jessica Harding, PhD Jessica Harding, PhD

Jess Harding, PhD

Assistant Professor, Department of Surgery, Emory University School of Medicine
Associate Director, Emory Health Services Research Center

Megan Urbanski, PhD Megan Urbanski, PhD

Megan Urbanski, PhD, MSW

Assistant Professor, Department of Surgery, Emory University School of Medicine
Affiliate Scientist, Regenstrief Institute

Emma Blythe Emma Blythe

Emma Blythe, MPH

Epidemiologist, Emory University

Highlighted Publications

End-Stage Renal Disease Treatment Choices Model and Use of Home Dialysis and Kidney Transplant

Publication: JAMA Health Forum

DOI:10.1001/jamahealthforum.2026.0874

Authors: Dixit MN, Koukounas KG, Drewry KM, Wilk AS, Lee Y, Patzer RE, Mehrotra R, Rivera-Hernandez M, Meyers DJ, Kim D, Shah A, Schmid CH, Trivedi AN

Association of a new waitlist mortality metric with likelihood of delisting among kidney transplant candidates

Publication: American Journal of Transplantation

DOI:10.1016/j.ajt.2026.02.013

Authors: Ross-Driscoll K, Di M, Buford J, Adler JT, Fridell J, McElroy L, Patzer RE

Regional Variation in Early Kidney Transplant Access Across Dialysis Facilities in 4 US Regions

Publication: Kidney International Reports

DOI:10.1016/j.ekir.2025.103721

Authors: Buford J, Di M, Harding JL, Drewry K, Kelty C, Wilk AS, Huml A, Rossi AP, Mohan S, Gelb B, Chopra B, Glicklich D, Anand PM, Handmacher M, Mulloy L, Dar WA, Reeves-Daniel A, Akalin E, McPartland KJ, Pastan SO, Patzer RE

A Novel Measure of Spatial Accessibility to Transplant Services Predicts Population-Based Access to Liver Transplant

Publication: American Journal of Transplantation

DOI: 10.1016/j.ajt.2025.07.615

Authors: Ross-Driscoll K, Huber S, Kramer M, Nephew L, Patzer RE

Development of Common Data Elements for Organ Transplantation

Publication: JAMA Network Open

DOI: 10.1001/jamanetworkopen.2025.7704

Authors: McElroy LM, Rogers U, Nichols L, Bhavsar NA, Schappe T, Harding J, Strauss AT, Gordon EJ, Ross-Driscoll K, Deirhoi-Reed R, Chan NW, Henson JB, Ng YH, Taber DJ, Milam AJ, Schold JD, Caicedo JC, Adams AB, Patzer RE, Berchuck SI, Matsouaka R, Gagnon J, Kirk AD

Implications of Increased Medicare Advantage Enrollment for Access to Kidney Transplant Waitlisting

Publication: Journal of the American Society of Nephrology

DOI:10.1681/ASN.0000000667

Authors: Adler JT, Kuk AE, Drewry KM, Nguyen KH, Wilk AS

Authors: Strauss AT, Caicedo JC, Welsh W, Reed RD, Gordon EJ, Taber D, Ng YH, Ross-Driscoll K, Schold JD, Serper M, Olson A, Harding JL, Adams A, Kirk AD, McElroy LM.

Authors: Kelty C, Buford J, Di M, Drewry KM, Urbanski M, Harding JL, Wilk AS, Pastan SO, Patzer RE

Health Disparity Metrics for Transplant Centers: Theoretical and Practical Considerations

Publication: Transplantation

DOI: 10.1097/TP.0000000000004973

Authors: Ross-Driscoll K, McElroy LM, Taber D, Patzer RE

Reducing Disparities in Access to Kidney Transplantation Regional Study A Randomized Trial in the Southeastern United States

Publication: Clinical Journal of the American Society of Nephrology

DOI: 10.2215/CJN.0000000586

Authors: Patzer RE, Buford J, Urbanski M, McPherson L, Paul S, Di M, Harding JL, Katz-Greenberg G, Rossi A, Anand PM, Reeves-Daniel A, Jones H, Mulloy L, Pastan SO

Regenstrief Center

  • Center for Health Services Research