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Lung cancer is the leading cause of cancer death worldwide, with mortality rates in most developed countries ranging from 35 to 95 fatalities per 100,000 in men and 10 to 20 deaths per 100,000 in women. Non-small-cell lung cancer is the most
Lung cancer is the leading cause of cancer death worldwide, withmortality rates in mostdeveloped countries ranging from 35 to 95 fatalities per 100,000 in men and 10to 20deaths per 100,000 in women. Non-small-cell lung cancer is the most commonlung malignancy, accounting for more than 75% of all lung cancers. At time ofdiagnosis, approximately 60% of non-small-cell lung cancer cases are locallyadvanced or metastatic, and more than 85% of patients diagnosed with thisneoplasm die of their disease. The 5-year survival of patients presenting withlocally advanced disease is about 10%, and for those with stage IV disease,survival drops to 1%. These dismal outcomes have not changed over the past 2decades, and thus the need for more effective treatment is obvious.
During the past 20 years, clinical investigators have attemptedto develop chemotherapeutic regimens that effectively prolong survival andprovide palliation for patients with non-small-cell lung cancer. Recentmeta-analyses have shown that platinum-based chemotherapy combined with thoracicradiotherapy (TRT) improved survival in the setting of locally advanced non-small-celllung cancer, as compared with radiotherapy alone. Combinations of platinum andTRT increased median survival by 3 months and demonstrated a 5% increase in5-year survival. Furthermore, data from randomized trials of concurrentchemoradiation in unresectable stage III non-small-cell lung cancer haveindicated significant improvements in survival, and several ongoing single-armphase I/II trials assessing new agents in combination with TRT have shownencouraging results.
In the late 1990s, several new agents emerged from clinicaldevelopment and demonstrated activity against non-small-cell lung cancer,including gemcitabine (Gemzar), paclitaxel (Taxol), docetaxel (Taxotere),vinorelbine (Navelbine), and irinotecan (CPT-11, Camptosar). In a 1998 article,Bunn and Kelly reviewed phase II studies of these new agents and listedsingle-agent objective responses of ³ 20% (range: 13%-27%), with mediansurvival duration of about 40 weeks (range: 34 to 38 weeks), and 1-year survivalof 40% (range: 24% to 52%) (Table 1). When these agents were evaluated incombination with platinum compounds, the overall response rates ranged from 35%to 47% with a median survival of 34 to 57 weeks; average 1-year survival rangedfrom 35% to 61% (Table 2).
In addition, a number of novel targeting therapies are underinvestigation in non-small-cell lung cancer, including matrixmetalloproteinase inhibitors, epidermal growth factor inhibitors, vascularendothelial growth inhibitors, farnesyl transferase inhibitors, cyclin dependentkinase inhibitors, and gene therapy (Table 3). However, at present, it isreasonable to consider that the newer chemotherapy agents used in combinationwith a platinum compound are the most effective regimens in patients withadvanced non-small-cell lung cancer. Of these recently approved agents,gemcitabine has provoked considerable interest, and it is the purpose of thissymposium to clarify gemcitabine’s role in the treatment of non-small-celllung cancer.
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