Curtis C. Harris, M.D.
We are investigating connections between inflammation, microRNAs, metabolome, microbiome and cancer using a precision medicine strategy. Molecular mechanisms of microRNAs and cytokines associated with human cancer diagnosis, prognosis, and therapeutic outcomes are being investigated. Gene-environment interaction is a seminal concept in the molecular epidemiology of human cancer; our ongoing studies include lung, colon and esophageal cancer. Cellular senescence is a tumor suppressive mechanism that can be activated by p53. We are focused on both the integrative p53 and microRNA networks in tumor suppression and the functional role of p53 isoforms, as natural regulators of cellular senescence and stem cell biology and their dysregulation in cancer and aging.
Our continuing research projects utilize an integrative biology, translational and precision medicine strategy, as evidenced by co-authored primary and collaborative studies. They reflect the priorities of the NCI FY17 Cancer Research Initiative and Cancer Moonshot Blue Ribbon Panel.
Project 1. Precision Medicine of Cancer
Biomarkers are the foundation upon which diagnostic precision is improved and comprise potential therapeutic targets. Our Biomarker program emphasizes the integration of molecular, clinical, and environmental data for single patients to identify lung, esophageal and colon cancer biomarkers and build a molecular taxonomy that will result in improved cancer diagnosis and treatment. We are focused on the earliest stages of cancer; when therapy is most effective but a subset of patients remain at high risk of recurrence. Our strategy is to begin by analyzing resources from our NCI-MD cohort and then validate those findings in multiple clinical cohorts throughout the world, to find associations that are generalizable to cancer populations globally and to uncover biological factors of health disparity. Through rigorous bioinformatics and statistical analyses of molecular data, including mRNA and miRNA, DNA methylation, inflammatory cytokines, and tumor and urinary metabolites, together with clinical and environmental exposure data for single patients, we develop signatures of cancer risk, diagnosis, prognosis, and therapeutic outcome. The integration of classifiers across different data types within a given disease generates hypothesis, illuminates novel disease mechanisms, and provides actionable information to guide medical decisions for cancer patients. We have also initiated studies of the lung cancer microbiome to determine its value as cancer biomarker and to understand the role of the microbiota in cancer initiation and progression.
Our Integrative Epidemiology research is based on ongoing case-control studies (using population-based controls) and is focused on lung, a tobacco-related cancer, and colon, a cancer type more associated with chronic inflammation. These studies integrate molecular data with carcinogen exposure, socio-economic, and epidemiological information. We validate our findings with independent multi-ethnic cohorts, contribute data to large multi-institutional studies, and have a long-standing interest and record of accomplishments in cancer health disparities.
Project 2: p53, Aging and Cancer
The p53 network is an intrinsic monitoring and responsive pathway of telomeric attrition and chronic stress involved in cellular aging and senescence. Cellular senescence, in cancer cells, can be a tumor suppressive mechanism that can be activated by p53. We are currently studying the molecular mechanisms of cellular senescence in normal human cells and the role of p53 isoforms in aging and carcinogenesis. Our research focuses on integrative p53 and miRNA networks in tumor suppression and the functional role of p53 isoforms, e.g., “dominant negative” ∆133p53, that also has gain of function as a transactivator of specific DNA repair genes such as RAD51 and “co-transactivator” of wild-type p53, p53β, both as natural regulators of cellular senescence, DNA repair and stem cell biology and are dysregulated in cancer, including damaging side effects of radiation and chemotherapy, and aging diseases, such as Hutchinson-Gilford Progeria Syndrome and Alzheimer’s Disease. As a result of molecular evolution, ∆133p53 is specifically present in humans and primates, but not in other organisms, including mice, because of lack of an initiating methionine codon corresponding to the human codon 133 at exon 5 of TP53.
Selected Recent Publications
- Nat Commun. 2018 Feb 22;9(1): 771, 2018. [ Journal Article ]
- Genome Bio. Aug 24;19(1): 123, 2018. [ Journal Article ]
Non-invasive urinary metabolomic profiling identifies diagnostic and prognostic markers in lung cancer.Cancer Res. 74: 3259-3270, 2014. [ Journal Article ]
- J. Clin. Invest. 123: 5247-57, 2013. [ Journal Article ]
Combination of protein coding and noncoding gene expression as a robust prognostic classifier in stage I lung adenocarcinoma.Cancer Res. 73: 3821-32, 2013. [ Journal Article ]
Harris received his M.D. from Kansas University School of Medicine. He completed his clinical training in internal medicine at the University of California-Los Angeles, Washington Veterans Administrative Hospital and the NCI. He has held positions of increasing responsibility at the NCI, and is also a Clinical Professor of Medicine and Oncology at Georgetown University School of Medicine. Harris has received numerous honors throughout his distinguished career including the Alton Ochsner Award relating Smoking and Health (American College of Physicians), Deichmann Award (International Union of Toxicology), Charles Heidelberger Award (International Society of Gastroenterological Carcinogenesis) and the Distinguished Service Medal (the highest honor of the U.S. Public Health Service), NCI Outstanding Mentor Award in 2007 and 2013, Ph.D. (Honorary) Nippon University School of Medicine, the AACR-Princess Takamatsu Award and the AACR-American Cancer Society: Cancer Epidemiology and Prevention Award. Harris has published more than 700 journal articles, 142 book chapters, and 13 books, and holds more than 30 patents owned by the U.S. Government. He also serves as Editor-in-Chief for the journal, Carcinogenesis, and has held or currently holds elected offices in scholarly societies and non-profit foundations including the American Association of Cancer Research, the International Society of Differentiations, the Keystone Symposia on Molecular and Cellular Biology and Aspen Cancer Conference. Harris has a wide range of scientific interests and accomplishments spanning molecular genetics of human cancer to molecular epidemiology of human cancer risk. (Select links tab for Science Watch, CCR Connections Articles, two youtube videos: https://www.youtube.com/watch?v=8LnIv_yeq2g and https://www.youtube.com/watch?v=MYUiS_Mh7eg)
|Jessica Beck Ph.D.||Postdoctoral Fellow (CRTA)|
|Elise Bowman M.S.||Research Chemist|
|Leandro Cruz Hermida||Predoctoral Fellow (Graduate Student)|
|Izumi Horikawa, M.D., Ph.D.||Staff Scientist|
|Sebastien Jo Ph.D.||Postdoctoral Fellow (CRTA)|
|Yasuyuki Kanke M.D.||Special Volunteer|
|Mohammed Khan B.S.||Research Biologist|
|Delphine Lissa Ph.D.||Postdoctoral Fellow (Visiting)|
|Masaru Matsumoto Ph.D.||Special Volunteer|
|Amelia Parker Ph.D.||Postdoctoral Fellow (CRTA)|
|Daxeshkumar Patel Ph.D.||Postdoctoral Fellow (Visiting)|
|Elisa Spillare B.S.||Technical Laboratory Manager|
|Snorri Thorgeirsson M.D., Ph.D.||Special Volunteer|
|Akriti Trehan Ph.D.||Postdoctoral Fellow (CRTA)|
|Kyra Ungerleider B.S.||Postbaccalaureate Fellow (CRTA)|
|Natalia von Muhlinen Ph.D.||Postdoctoral Fellow (Visiting)|
|Judith Welsh||Research Biologist|