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Vol. 38. Issue 4.
Pages 166-171 (April 2002)
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Vol. 38. Issue 4.
Pages 166-171 (April 2002)
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El fenómeno “Will-Rogers”. Migración de estadios en carcinoma broncogénico, tras aplicar criterios de certeza clasificatoria
The "Will-Rogers" phenomenon. Stage migration in bronchogenic carcinoma after applying certainty criteria
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A. López Encuentra
Corresponding author
lencuent@h12o.es
lencuent@eresmas.net

Correspondencia: Servicio Neumología. Hospital Universitario 12 de Octubre. Ctra. de Andalucía, km 5,4. 28041 Madrid
, A. Gómez de la Cámara, A. Varela de Ugarte, N. Mañes, N. Llobregat, Grupo Cooperativo de Carcinoma Broncogénico de la Sociedad Española de Neumología y de Cirugía Torácica (GCCB-S) *
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Objetivo

Cuantificar el cambio en la clasificación TNM-estadios (migración numérica) y la modificación en supervivencia (migración pronóstica) al aplicar criterios de certeza clasificatoria a una población de carcinoma broncogénico no microcítico (CBNM) con tratamiento quirúrgico

Métodos

La población está formada por 1.844 casos de CBNM operados entre 1993 y 1996 por los hospitales del Grupo Cooperativo de Carcinoma Broncogénico de la Sociedad Española de Neumología y de Cirugía Torácica (GCCB-S)

La estadificación TNM quirúrgico-patológica (p) de cada paciente tiene dos clasificaciones; una inicial efectuada por cada centro del GCCB-S (TNMp-i) y otra, con mayor certeza clasificatoria (TNMp-cc), que se obtiene tras la aplicación de criterios más exigentes. En los casos en que ambas clasificaciones no coincidan se produce una migración numérica, evaluando la posible migración pronóstica con las nuevas estadificaciones

Resultados

Se detecta una gran migración numérica en la clasificación N0p (de 1.091 a 665 casos). Estos cambios no producen migraciones pronósticas en el grupo considerado globalmente, ni tampoco en las categorías T1–2N0M0p; sin embargo, en la clasificación T3N0M0p se incrementa en 13 meses la mediana de supervivencia. La diferencia de supervivencia a3años (S3) entre T3N0M0pi sin confirmación de certeza (S3=0,30; intervalo de confianza [IC] del 95%; 0,18–0,42; n=59) y T3N0M0p-cc (S3=0,54; IC del 95%=0,44–0,64; n=92) era significativa (rangos logarítmicos; p=0,035); este comportamiento no se observa en T1–2N0M0p

Conclusión

La migración numérica observada por la aplicación de criterios de certeza clasificatoria quirurgico-patológica es relevante, aunque la repercusión pronóstica es pequeña, salvo en T3N0M0p, en donde se detecta una mejora significativa del pronóstico (migración tipo fenómeno “Will-Rogers”)

Palabras clave:
Cáncer de pulmón
Pronóstico
Clasificación TNM
Estadificación
Migración de estadios
Objective

To quantify changes in tumornode-metastasis (TNM) staging (numerical migration) and survival (prognostic migration) that arise when certainty criteria are applied to a patient population with non-small cell lung cancer (NSCLC) treated surgically

Methods

The population consisted of 1,844 patients with NSCLC who underwent surgery between 1993 and 1996 at hospitals participating in the Bronchogenic Carcinoma Co-operative Group of the Spanish Society of Pneumology and Thoracic Surgery (GCCB-S). For every patient, surgical-pathological TNM staging (p) was based on two classifications: initial staging by each participating GCCB-S center (pTNM-i) and a second classification bearing greater classificatory certainty (pTNM-cc) resulting from the application of stricter criteria. Numerical migration was said to have occurred in cases where the two classifications did not coincide, and the possible prognostic migration under the new staging was then assessed

Results

The results revealed great numerical migration in the pN0 classification (from 1,091 cases to 665). The changes did not result in prognostic migration either for the group as a whole or for pT1–2N0M0 cases. However, for pT3N0M0 cases, median survival increased by 13 months. The difference in three-year survival (S3) for pT3N0M0-i without certainty confirmation [S3=0.30 (95%CI 0.18–0.42), n=59] and pT3N0M0-cc [S3=0.54 (95%CI=0.440.64), n=92] was significant (log-rank, p=0.035). Such behavior was not observed for pT1–2N0M0

Conclusions

The numerical migration observed as a result of applying surgical-pathological classificatory certainty criteria is relevant but the prognostic repercussion is scarce, except in cases classified as pT3N0M0, in which a significant positive prognostic migration is observed (the “Will Rogers phenomenon”)

Keywords:
Neoplasm
lung
staging
Prognosis
TNM classification
Stage migration
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Al final del artículo se presenta un apéndice con los miembros de grupo coordinador, responsables locales y hospitales, y unidad de análisis.

Copyright © 2002. Sociedad Española de Neumología y Cirugía Torácica
Archivos de Bronconeumología
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