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BACKGROUND.
Previous reports based on small patient numbers suggested that changes in serum HER‐2/neu levels may predict response or lack of response to trastuzumab‐based therapies in metastatic breast cancer (MBC). The objectives of this study were to pool data from 307 patients with MBC from 7 medical institutions to validate that the serum HER‐2/neu profile predicts patient resistance to trastuzumab and to establish a clinically relevant cutoff.METHODS.
This was an international, multicenter, retrospective analysis of individual pooled data from 307 patients with MBC who were treated with first‐line trastuzumab‐based therapy. Serum was collected at baseline and 30 to 120 days after the initiation of trastuzumab therapy. A serum HER‐2/neu decrease ≥20% (receiver operating curve analysis) was defined as a significant HER‐2/neu change.RESULTS.
Of the 307 patients with MBC, 191 patients (62%) had a significant decline (>20%) in serum HER‐2/neu and 116 patients (38%) did not. The objective response rate was 57% for patients who achieved this decline in serum HER‐2/neu (>20%) compared with 28% for patients who did not. Patients who achieved this decline in serum HER‐2/neu also had a significantly longer time to disease progression (320 days vs 180 days; P < .0001), longer duration of response (369 days vs 230 days; P = .008), and longer overall survival (898 days vs 593 days; P < .018).CONCLUSIONS.
In this pooled analysis of 307 patients with MBC, individuals who did not achieve a significant decline (≥20%) in serum HER‐2/neu levels had decreased benefit from trastuzumab‐based therapy, and these patients should be considered for clinical trials evaluating additional HER‐2/neu‐targeted interventions. Cancer 2008. © 2008 American Cancer Society. 相似文献Background. In a large-scale trial of patients with acute coronary syndromes, hirudin provided modest benefit compared with heparin. However, the interaction with thrombolytic agents was not specifically assessed.
Methods. Patients with symptoms of acute myocardial infarction and electrocardiographic ST segment elevation were treated with thrombolytic therapy and randomly assigned to receive hirudin or heparin.
Results. A total of 2,274 patients received t-PA, and 1,015 received SK. Baseline characteristics were balanced by antithrombin assignment. Among SK-treated patients, death or reinfarction at 30 days occurred more often in those treated with adjunctive heparin (14.4%) rather than hirudin (8.6%, odds ratio [OR] 1.78, 95% confidence interval [CI] 1.20 to 2.66, p = 0.004). Among t-PA–treated patients, the rates were 10.9% with heparin and 10.3% with hirudin (OR 1.06, 95% CI 0.81 to 1.38, p = 0.68; for treatment heterogeneity: chi-square 4.20, degrees of freedom [df] 1, p = 0.04). After adjustment for baseline differences between thrombolytic groups, the rates were 9.1% for SK with hirudin, 10.3% for t-PA with hirudin, 10.5% for t-PA with heparin and 14.9% for SK with heparin (for treatment heterogeneity: chi-square 4.5, df 1, p = 0.03), suggesting that the beneficial treatment effect of hirudin was limited to the SK-treated patients.
Conclusions. Hirudin interacts favorably with SK but not t-PA, highlighting the importance of thrombin activity after SK therapy and the potential for simulating the effects of a more potent fibrinolytic agent through direct antithrombin therapy. 相似文献