In the 1990s, chemotherapy has been shown able to improve survival of patients presenting with advanced non-small cell lung cancer (NSCLC, 1995). The survival benefit was obtained with first-generation active cytostatic agents -mainly ifosfamide, vinblastine, vindesine, mitomycin (MMC) -in combination with cisplatin (Donnadieu et al, 1991). New active drugs -the second generation -have appeared during the last decade, including gemcitabine, paclitaxel, docetaxel, vinorelbine and irinotecan. Their role in addition or in place of the first-generation agents, which should not be considered as obsolete for the unique reason that they are older and less fashionable, has yet to be defined (Meert et al, 1999).In this context, we have performed a systemic review of the literature about the role of one of the first-generation drugs, mitomycin (MMC), in the management of NSCLC. In order to determine if it is worthy to further conduct trials with that agent, we have searched answers to the 3 following questions: (1) is MMC an active drug against NSCLC? (2) does MMC improve the results when added to other active agents? (3) is MMC useful for salvage therapy? We have performed this investigation by using a methodology similar to that we have already used to conduct evidencebased medicine analyses of the literature.
MATERIAL AND METHODSTo be eligible for the systematic review, a trial had to fulfil the following criteria: to deal only with NSCLC, to have been published as a full paper in the English or French language, to have a prospective design and to assess the effect of MMC in a randomized trial or in a first-line or second-line phase II trial according to the studied question.Trials were identified by an electronic search (Medline) in addition to the use of the personal bibliography of one of the authors and by consulting the references reported in the selected articles.Each trial was read and assessed for methodology by 12 investigators, including 11 physicians and 1 biostatistician. Each investigator independently extracted the data from the articles and disagreements were resolved by consensus. Randomized trials were evaluated for methodology by 2 quality scores calculated on the basis of the data reported in the publications: the score proposed by Chalmers et al (1981) and used by Marino in two meta-analyses (Marino et al, 1994(Marino et al, , 1995; and the score proposed by the ELCWP (European Lung Cancer Working Party) (Mascaux et al, 2000). Phase II trials were assessed by the ELCWP score for phase II studies (Meert et al, 1999).The result of a phase III trial was considered as conclusive if the P value for the statistical test comparing the survival distributions between arms for the overall patients populations was <0.05 in favour of the experimental arm. The trial was then called 'positive'. In the other situations (statistically significant survival benefit for the control arm or non-statistically significant difference in survival distributions), it was called 'negative'.The association between the quality s...