Loretto Carvajal, M.D., M.S.

Loretto Carvajal, M.D., M.S.
Division of Cancer Epidemiology and Genetics (DCEG)
Entry Year

Medical Degree

M.D., Universidad Nacional de Costa Rica--San José, Medicine and Surgery (2008)

Master's Degree

M.S., Universidad Nacional de Costa Rica--San José (2021)

Research Interests

Human papillomavirus virus and its related cancers, with a special focus on HPV-driven head and neck tumors

Primary Preceptor/Branch/Division

Aimee Kreimer, Ph.D., Infections & Immunoepidemiology Branch (IIB), Division of Cancer Epidemiology and Genetics (DCEG)


Carvajal LJ, Herrero R, Angulo MM, Schussler J, Porras C, Ocampo R, et al. Prevalencia y determinantes de la infección por virus de papiloma humano en mujeres jóvenes de Guanacaste y Puntarenas, Costa Rica, 2004-2005. Salud Pública de México. 2023;65(3, may-jun):253-64. doi: 10.21149/14286.

Shing JZ, Corbin J, Kreimer AR, Carvajal LJ, Taparra K, Shiels MS, Vo JB. HPV-Associated Cancer Incidence by Disaggregated Asian American, Native Hawaiian, and Other Pacific Islander Ethnicity. JNCI Cancer Spectr. 2023 Feb 15:pkad012. doi: 10.1093/jncics/pkad012. Online ahead of print. PMID: 3679007.

Carvajal LJ, Shing JZ, Vanegas JC, González E, Guillén D, Sierra MS, Hildesheim A, Porras C, Herrero R, Torres G, Shiels MS, Calderón A, Kreimer AR. Trends in incidence rates of head and neck squamous cell carcinomas overall and by potential relatedness to human papillomavirus, Costa Rica 2006 to 2015. Int J Cancer. 2023 Jan 17. doi: 10.1002/ijc.34437. Online ahead of print. PMID: 36650690.

Sierra MS, Tsang SH, Porras C, Herrero R, Sampson JN, Cortes B, Schussler J, Wagner S, Carvajal L, Quint W, Kreimer AR, Hu S, Rodriguez AC, Romero B, Hildesheim A; Costa Rica HPV Vaccine Trial (CVT) Group. Analysis of cervical HPV infections among unvaccinated young adult women to inform vaccine strategies in this age group: the Costa Rica HPV Vaccine Trial. Sex Transm Infect. 2022 Jul 16:sextrans-2022-055434. doi: 10.1136/sextrans-2022-055434. Online ahead of print. PMID: 35842229.

Shing JZ, Hu S, Herrero R, Hildesheim A, Porras C, Sampson JN, Schussler J, Schiller JT, Lowy DR, Sierra MS, Carvajal L, Kreimer AR; Costa Rica HPV Vaccine Trial Group. Precancerous cervical lesions caused by non-vaccine-preventable HPV types after vaccination with the bivalent AS04-adjuvanted HPV vaccine: an analysis of the long-term follow-up study from the randomised Costa Rica HPV Vaccine Trial. Lancet Oncol. 2022 Jul;23(7):940-949. doi: 10.1016/S1470-2045(22)00291-1. Epub 2022 Jun 13. PMID: 35709811.

Porras C, Sampson JN, Herrero R, Gail MH, Cortés B, Hildesheim A, Cyr J, Romero B, Schiller JT, Montero C, Pinto LA, Schussler J, Coronado K, Sierra MS, Kim JJ, Torres CM, Carvajal L, Wagner S, Campos NG, Ocampo R, Kemp TJ, Zuniga M, Lowy DR, Avila C, Chanock S, Castrillo A, Estrada Y, Barrientos G, Monge C, Oconitrillo MY, Kreimer AR. Rationale and design of a double-blind randomized non-inferiority clinical trial to evaluate one or two doses of vaccine against human papillomavirus including an epidemiologic survey to estimate vaccine efficacy: The Costa Rica ESCUDDO trial. Vaccine. 2022 Jan 3;40(1):76-88. doi: 10.1016/j.vaccine.2021.11.041. Epub 2021 Nov 29. PMID: 34857420.5.