[Pre- and peri-surgical chemotherapy of stage I and II resectable non-small cell lung cancers]

Chemotherapy (CT) combined with surgery in non-small cell lung cancers has been studied for a number of years. It can be used prior to or following surgery (adjuvant). A long rather unfruitful period ended with the meta-analysis of the Non-Small Cell Cancer Collaborative Group, published in the British Medical Journal in 1995 that suggested an increase in survival of 5% at 5 years with the addition of adjuvant chemotherapy to surgery. Since this publication, arguments have accumulated in favour of this combination. Phase II studies have shown the feasibility of pre-surgical CT. A randomised trial in France showed a near 10% improvement in survival at 5 years, approaching statistical significance, and that this beneficial effect was further enhanced in the early stages of cancer. Excess post-surgical morbidity and mortality, even though non-significant, emphasizes the need for an effective but less toxic CT than the mitomycine-ifosfamide-cisplatin combination initially selected. In the field of adjuvant CT, the arguments in favour of the association have accumulated with the positive results of 3 studies, the IALT trial, the BR10 trial of the Canadian National Cancer Institute and the 9633 trial of the CALGB, with the latter two studies presented this year at the American Society of Clinical Oncology meeting. Four other pre-surgery CT trials are ongoing, but their results will not be available for several years. When choosing optimal timing among the various CT administration methods, before or after surgery, the arguments are in favour of pre-surgery CT: the possibility of assessing the chemosensitivity of the tumor, permitting the early withdrawal of treatment if it fails (presently in 40% of patients), the enhanced acceptability of CT by the patients, and the increase in resectability of the tumours. Conversely, however, one must note the greater difficulty for staging and the increase in post-surgical risks, basically in N2 patients, which will gradually lead to its replacement by the use of 3rd generation CT.