Nathanael R. Fillmore
Topics / Comparative Analysis
Topic

Comparative Analysis

Fillmore utilizes comparative analysis to evaluate disparities in clinical outcomes and healthcare utilization between Veterans Affairs patients and the general United States population. His research identifies significant variances in cancer survival and staging for melanoma and Merkel cell carcinoma, while also demonstrating how single-payer delivery models may mitigate racial inequities in cancer mortality. These studies underscore the influence of healthcare system structures and patient demographics on the quality and accessibility of oncologic care.

U.S. Veterans and VA Data 7 SEER Database 4 VA Cancer Registry 3 Retrospective Cohort Study 3 Cox Proportional Hazards Model 3 Cutaneous Melanoma 2 Disease Staging 2 Melanoma Specific Survival 2 Fine-Gray Models 2 Logistic Regression 2 Age Factors 2 Real World Evidence 2

Publications (8)

2026

Sentinel lymph node biopsy utilization and positivity in veterans with cutaneous melanoma: A comparative analysis of the VA Cancer Registry and the SEER Program.

Daniel Y. Kim, Susan M. Swetter, Linden Huhmann, Jacqueline M. Ferguson, Kimberly Breglio, Allyson C. Spence, Lee Wheless, Mary T. Brophy, Nhan V. Do, Nathanael Fillmore‡, Rebecca I. Hartman‡‡ Equal senior authorship

Journal of the American Academy of Dermatology
U.S. Veterans and VA Data Cutaneous Melanoma VA Cancer Registry SEER Database Sentinel Lymph Node Biopsy
2022

Increased relative proportions of advanced melanoma among veterans: A comparative analysis with the Surveillance, Epidemiology, and End Results registry.

Michael S. Chang†, Jennifer La†, Nicole Trepanowski, David Cheng, John R. Bihn, Nhan Do, Mary Brophy, Nathanael R. Fillmore‡, Rebecca I. Hartman‡† Equal first authorship · ‡ Equal senior authorship

Journal of the American Academy of Dermatology87(1), 72-79
VA Cancer Registry SEER Database U.S. Veterans and VA Data Cutaneous Melanoma Melanoma Specific Survival
2021

Evaluating the impact of age on immune checkpoint therapy biomarkers.

Rossin Erbe, Zheyu Wang, Sharon Wu, Joanne Xiu, Neeha Zaidi, Jennifer La, David Tuck, Nathanael Fillmore, Nicolas A. Giraldo, Michael Topper, Stephen Baylin, Marc Lippman, Claudine Isaacs, Reva Basho, Ilya Serebriiskii, Heinz-Josef Lenz, Igor Astsaturov, John Marshall, Josephine Taverna, Jerry Lee, Elizabeth M. Jaffee, Torres Evanthia T. Roussos, Ashani Weeraratna, Hariharan Easwaran, Elana J. Fertig

Cell Reports36(8), 109599
Age Factors Biomarkers Comparative Analysis Genomic Analysis Immune Checkpoint Inhibitors