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1 Dépt de Médecine et Laboratoire d'Investigation Clinique H.J. Tagnon, Institut Jules Bordet, Centre des Tumeurs de l'Université Libre de Bruxelles, Brussels, Belgium and 2 Service de Pneumologie et Oncologie Thoracique, Centre Hospitalo-Universitaire Calmette, Lille, France
CORRESPONDENCE: J.P. Sculier, Service de Médecine, Institut Jules Bordet, 1 rue Héger Bordet, B-;1000, Brussels, Belgium. Fax: 32 25343756
Keywords: lung cancer, meta-analysis, p53, prognosis, survival, systemic review
Received: July 7, 2000
Accepted April 12, 2001
Abstract
The role of p53, as a prognostic factor for survival in lung cancer, is controversial and the purpose of the present systematic review of the literature is to determine this effect.
Published studies were identified with the objective to aggregate the available survival results after a methodological assessment using a scale specifically designed by the European Lung Cancer Working Party (ELCWP). To be eligible, a study had to deal with p53 assessment in lung cancer (primary site) only, and to provide a survival comparison according to the p53 status.
Among the 74 eligible papers, 30 identified p53 abnormalities as a univariate statistically significant poor prognostic factor and 56 provided sufficient data to allow survival results aggregation. There was no significant difference between the trials that either showed or did not show a prognostic effect of p53 according to the methodological score or to the laboratory technique used. The studies were categorized by histology, disease stage, treatment and laboratory technique. Combined hazard ratios suggested that an abnormal p53 status had an unfavourable impact on survival: in any stage nonsmall cell lung cancer (NSCLC) the mean (95% confidence interval) was 1.44 (1.20–1.72) (number of studies included in the subgroup was 11), 1.50 (1.32–1.70) in stages I–II NSCLC (n=19), 1.68 (1.23–2.29) in stages I–IIIB NSCLC (n=5), 1.68 (1.30–2.18) in stages III–IV NSCLC (n=9), 1.48 (1.29–1.70) in surgically resected NSCLC (n=20), 1.37 (1.02–1.85) in squamous cell carcinoma (n=9), 2.24 (1.70–2.95) in adenocarcinoma (n=9), 1.57 (1.28–1.91) for a positive immunohistochemistry with antibody 1801 (n=8), 1.25 (1.09–1.43) for a positive immunohistochemistry with antibody DO-;7 (n=16), and 1.65 (1.35–2.00) for an abnormal molecular biology test (n=13). Data were insufficient to determine the prognostic value of p53 in small cell lung cancer.
In each subgroup of nonsmall cell lung cancer, p53 abnormal status was shown to be associated with a poorer survival prognosis.
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