Doernbecher Children's Hospital

Current Pediatric Hematology and Oncology Fellows

Florence Choo

Florence Choo
  • M.D., University of Oklahoma College of Medicine, 2015
  • Residency: University of Rochester, 2018
  • Currently a first year fellow

Patrick DeMartino

Patrick DeMartino
  • M.D., University of Massachusetts Medical School, 2015
  • Residency: Hasbro Children's Hospital, Alpert School or Medicine, 2018 

Matthew Dietz

Matthew Dietz, D.O., M.S.Ed.
  • D.O., M.S.Ed.: University of New England College of Osteopathic Medicine, 2013
  • Residency: Oregon Health & Science University, 2017
  • Currently a second year fellow
  • Research: Dr. Dietz long-term research interests involve the development of a comprehensive understanding of key mechanisms of tumor heterogeneity and how alterations in the tumor microenvironment contribute to metastatic disease. The goal of his current project is to develop a novel circulating cell population as a biomarker for treatment response and treatment related evolution in pediatric high grade glioma.
  • Research Mentor: Melissa Wong, Ph.D.

Kellee Parker

Kellee Parker, D.O.
  • D.O.: Rocky Vista College of Osteopathic Medicine, 2014
  • Residency: Oregon Health & Science University, 2017
  • Currently a second year fellow
  • Research: Conducting health experiences research to investigate the family and patient experience of childhood cancer with plans to use this data to guide my own and others' clinical research questions and trials. 
  • Research Mentors: Erika Cottrell, Ph.D., M.P.P. and Cynthia Morris, Ph.D., M.P.H.

Adam DuVall

Adam DuVall
  • M.D., M.P.H.: Case Western Reserve University School of Medicine, 2012
  • Residency: University of Michigan, 2016
  • Currently a third year fellow
  • Research: Characterize the influence of the inflammatory microenvironment on the progression from germline RUNX1 mutation to AML. Describe the specific clonal evolution and potential interventions. He also will continue with clinical research in adolescent and young adult (AYA) oncology.
  • Research Mentors: Anupriya Agarwal, Ph.D. and Brandon Hayes-Lattin, M.D.

Nadav Lelkes

Nadev Lelkes
  • M.D.: Albert Einstein College of Medicine of Yeshiva University, 2013
  • Residency: Hasbro Children’s Hospital, Alpert School of Medicine, 2016
  • Currently a third year fellow
  • Research: Dr. Lelkes is interested in the imaging and treatment of brain tumors and he has two active projects. The first is working towards a new medulloblastoma selective PET tracer. The second is testing novel PARP inhibitors in atypical teratoid/rhabdoid tumors. 
  • Research Mentor: Jae Cho, M.D.

Contact us

Evan Shereck, M.D.
Director, Pediatric Hematology/Oncology Fellowship Program
Oregon Health & Science University
Division of Pediatric Hematology/Oncology - CDRCP
3181 S.W. Sam Jackson Park Road
Portland, OR 97239
503 494-0829

Rebecca Loret de Mola
Associate Director, Pediatrics Hematology/Oncology Fellowship Program
503 494-0829

Beth Wamala
Fellowship Coordinator 
503 494-0830