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Hire Percy G.

United States

USD 100 /hr

MD | Cancer Outcomes & Real-World Data Research | Epidemiology | Survival & Disparities Analyst

Profile Summary

I am a Physician and Epidemiologist with 15+ years of experience in oncology research, health systems analysis, and real-world data (RWD) studies across the United States and Latin America. I currently serve as a Clinical Research Scientist at the Helen F. Graham Cancer Center, where I lead retrospective cohort studies focused on treatment delays, recurrence patterns, cancer disparities, and survival outcomes. My expertise includes: • Design and execution of retrospective and observational cohort studies • Survival analysis (Kaplan–Meier, Cox regression, time-to-event modeling) • Real-World Evidence (RWE) generation from registry and EHR data • REDCap database design and clinical data abstraction workflows • Geospatial and disparities analysis • Manuscript development and methodological writing • IRB-ready protocol preparation Previously, I completed advanced research training at the National Cancer Institute (NCI), Division of Cancer Control and Population Sciences, contributing to peer-reviewed publications and international cancer prevention initiatives. I collaborate with clinicians, academic researchers, and health systems to translate complex data into publishable, policy-relevant evidence. Available for: • Study design consulting • Advanced statistical analysis • Methods section writing • Oncology research advising • Cancer disparities and implementation science projects

Subject Matter Expertise

• ☆ Public Health
• ☆ Epidemiology

Services

• Writing
• Research
• Consulting
• Data & AI

Writing Medical Writing, Technical Writing, Creative Writing

Research Gap Analysis, Scientific and Technical Research, Secondary Data Collection

Consulting Healthcare Consulting

Data & AI Statistical Analysis, Data Visualization, Big Data Analytics, Data Mining, Data Cleaning, Data Processing, Data Insights

Work Experience

Researcher

Helen Graham Cancer Center And Research Institute

May 2025 - Present

Fellow

National Cancer Institute

June 2021 - June 2025

MD

Caja Costarricense del Seguro Social

September 2010 - May 2020

Education

Medico Cirujano (Medicina)

Universidad Hispanoamericana

- Present

Master en Epidemiologia (Ciencias Veterinarias)

Universidad Nacional de Costa Rica

- Present

Digital Health (Health)

Harvard University

January 2022 - December 2022

Maestria en Gerencia de Innovacion (Administracion de Empresas)

Instituto Tecnológico de Costa Rica

January 2017 - December 2017

Medico Cirujano

Universidad Hispanoamericana

January 2002 - December 2010

Certifications

• Certificate in Digital Health

  Harvard Business School

  June 2022 - Present

Publications

JOURNAL ARTICLE

Guzmán, P. and Halpern, M. (2026) Effects of Treatment Delays on Colorectal Cancer Survival. Journal of Cancer Therapy, 17, 119-132. doi: 10.4236/jct.2026.172012 .

Guzman, P., Castillo, K., Yglesias, M., Alfaro, A., Mainieri, G., Castillo, E. and Leon, A. (2026) Survival Rates of Patients Diagnosed with Colorectal Cancer in Costa Rica (2020-2021): A Retrospective Cohort Study at the Centro de Detección Temprana de Cáncer Gástrico. Journal of Cancer Therapy, 17, 105-118. https://doi.org/10.4236/jct.2026.172011 .

Guzman, P. , Marcus, P. , Salazar, U. , Bolaños, S. and Halpern, M. (2025) The Costa Rican Social Security Fund: The Cornerstone of the Costa Rican Health System. Open Journal of Applied Sciences, 15, 1466-1485. doi: 10.4236/ojapps.2025.155102 .

Guzman, P. (2025) Emergency Services Utilization and Hospital Bed Management in Costa Rica: A Review. Open Journal of Applied Sciences, 15, 731-734. doi: 10.4236/ojapps.2025.153047 .

Montero PG (2023) Comprehensive Analysis of Cancer Incidence and Mortality Trends in Costa Rica: Implications for Public Health. J Trop Dis. 11:413 .

1. Aparicio A, Guzman P, Morera M, et al. The First Population-Level Description of Women Diagnosed With Invasive Breast Cancer in Costa Rica From 2008 to 2012: A Cross-Sectional Study. Cancer Control. 2023;30. doi:10.1177/10732748231193550 .

Alejandro, C. , Percy, G. and Jack, M. (2023) Epidemiological Patterns of Common Cancers in Costa Rica: An Overview up to 2020. Open Journal of Social Sciences, 11, 500-517. doi: 10.4236/jss.2023.116033 .

Amada Aparicio, Percy Guzman, Melvin Morera, Yoleni Calvo, Marjorie Obando, Denis Landaverde, Ileana González, Esmeralda Ramirez-Pena (2023). The First Population-Level Description of Women Diagnosed With Invasive Breast Cancer in Costa Rica From 2008 to 2012: A Cross-Sectional Study . Cancer Control.

Aparicio, A., Guzman, P., Ramirez-Pena, E., Morera Salas, M., & Halpern, M. (2023). Breast Cancer Survival Rates in Costa Rican Social Security Fund Patients: A 5-Year Analysis. Journal Name, Volume(Issue), Page numbers. https://doi.org/10.4236/jss.2023.119018 .

CONFERENCE ABSTRACT

Percy Guzman (2023). Effects of treatment delays on lung cancer survival. ASCO Quality of Care.

Percy Guzman (2023). Effects of Treatment Delays on Colorectal Cancer Survival. 16th AACR Conference on The Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved.

https://aacrjournals.org/cancerres/article/83/5_Supplement/P4-03-04/717896/Abstract-P4-03-04-The-first-population-level .