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Inicio Revista Colombiana de Cancerología Determinants of LSIL Regression in Women from a Colombian Cohort
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Vol. 14. Issue 4.
Pages 199-209 (January 2010)
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Vol. 14. Issue 4.
Pages 199-209 (January 2010)
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Determinants of LSIL Regression in Women from a Colombian Cohort
Determinantes de la regresión de lesiones cervicales de bajo grado en una cohorte de mujeres colombianas
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Mónica Molano1,
Corresponding author
mmolano@cancer.gov.co

Corresponding Grupo de Investigación en Biología del Cáncer. Instituto Nacional de Cancerología. Av. 1a N° 9-85. Tel.: 571 3341111, ext. 4205.
, Mauricio González2, Óscar Gamboa3, Natasha Ortiz2, Joaquín Luna4, Gustavo Hernandez5, Héctor Posso6, Raúl Murillo3, Nubia Muñoz7, for the INC HPV Study Group
1 Grupo de Investigación en Biología del Cáncer – Instituto Nacional de Cancerología de Colombia
2 Grupo de Investigación Clínica - Instituto Nacional de Cancerología de Colombia
3 Subdirección de Investigaciones - Instituto Nacional de Cancerología de Colombia
4 Grupo de Ginecología Oncológica - Instituto Nacional de Cancerología de Colombia
5 Grupo de Investigación Epidemiológica - Instituto Nacional de Cancerología de Colombia
6 Liga Colombiana de Lucha Contra el Cáncer Seccional Bogotá, Bogotá, Colombia
7 Profesora Emérita - Instituto Nacional de Cancerología, Bogotá, Colombia
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Abstract
Objective

To analyze the role of Human Papillomavirus (HPV) and other risk factors in the regression of cervical lesions in women from the Bogotá Cohort.

Methods

200 HPV positive women with abnormal cytology were included for regression analysis. The time of lesion regression was modeled using methods for interval censored survival time data. Median duration of total follow-up was 9 years.

Results

80 (40%) women were diagnosed with Atypical Squamous Cells of Undetermined Significance (ASCUS) or Atypical Glandular Cells of Undetermined Significance (AGUS) while 120 (60%) were diagnosed with Low Grade Squamous Intra-epithelial Lesions (LSIL). Globally, 40% of the lesions were still present at first year of follow up, while 1.5% was still present at 5 year check-up. The multivariate model showed similar regression rates for lesions in women with ASCUS/AGUS and women with LSIL (HR=0.82, 95% CI 0.59–1.12). Women infected with HR HPV types and those with mixed infections had lower regression rates for lesions than did women infected with LR types (HR=0.526, 95% CI 0.33–0.84, for HR types and HR=0.378, 95% CI 0.20–0.69, for mixed infections). Furthermore, women over 30 years had a higher lesion regression rate than did women under 30 years (HR=1.53, 95% CI 1.03–2.27). The study showed that the median time for lesion regression was 9 months while the median time for HPV clearance was 12 months.

Conclusions

In the studied population, the type of infection and the age of the women are critical factors for the regression of cervical lesions.

Key words:
Human papillomavirus
cervical intraepithelial neoplasm
risk factors
follow-up studies
Resumen
Objetivo

Analizar el papel del virus del papiloma humano (VPH) y otros factores en la regresión de lesiones del cuello del útero en mujeres de la cohorte de Bogotá, Colombia.

Métodos

El tiempo medio de seguimiento fue nueve años. Se incluyeron 200 mujeres VPH positivas con citología anormal. El tiempo de regresión de lesión fue modelado mediante análisis de supervivencia censurando por intervalos.

Resultados

80 mujeres (40%) tuvieron células escamosas atípicas de significado indeterminado (ASCUS) o células glandulares atípicas de significado indeterminado (AGUS) y 120 (60%) tuvieron lesiones escamosas intraepiteliales de bajo grado (LEI-BG). El 40% de las lesiones estaban presentes en el primer año de seguimiento, mientras que el 1,5% aún estaba a los cinco años. Se observaron tasas similares de regresión para ASCUS/AGUS y LEI-BG (HR=0,82, IC 95% 0,59–1,12). Mujeres infectadas con VPH de alto riesgo y aquéllas con infecciones mixtas tuvieron tasas inferiores de regresión de las lesiones que las mujeres con VPH de bajo riesgo (HR=0,526, IC 95% 0,33–0,84, para los VPH de alto riesgo, y HR=0,378, IC 95% 0,20–0,69, para las infecciones mixtas). Las mujeres mayores de 30 años tuvieron una mayor tasa de regresión de lesiones que las menores de 30 (HR= 1,53, IC 95% 1,03–2,27). El tiempo medio de regresión de las lesiones fue 9 meses, y el tiempo medio para la eliminación del VPH fue 12 meses.

Conclusiones

En la población estudiada, el tipo de infección y la edad de las mujeres son factores críticos para la regresión de lesiones cervicales.

Palabras Clave:
virus del papiloma humano
regresión de lesiones cervicales
factores de riesgo
estudios de seguimiento
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