The Italian Breast Cancer Prevention Trial with Tamoxifen

The Italian Breast Cancer Prevention Trial with Tamoxifen
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意大利他莫昔芬预防乳腺癌试验

DOI:
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发表时间:
2001
影响因子:
5.2
通讯作者:
A. Decensi
A. Decensi
中科院分区:
综合性期刊3区
文献类型:
--
作者:
A. Guerrieri;Arianna Galli;N. Rotmensz;A. Decensi

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摘要:意大利他莫昔芬预防研究纳入了 5408 名 35-70 岁的健康子宫切除女性,她们被随机服用 20 毫克/天的他莫昔芬或安慰剂,为期 5 年。中位随访 46 个月后,观察到静脉血管事件的风险增加(他莫昔芬组 38 例,安慰剂组 18 例,P= 0.0053),主要包括浅静脉炎,并且发生了 41 例乳腺癌(他莫昔芬组 19 例,安慰剂组 22 例,P= 0.64)。然而,亚组分析表明,持续接受雌激素替代疗法(ERT,主要是透皮疗法)和接受他莫昔芬治疗的女性乳腺癌发病率显着下降,其中接受安慰剂的 390 名 ERT 使用者中有 8 例患乳腺癌,而服用他莫昔芬的 362 名 ERT 使用者中有 1 例患乳腺癌(RR = 0.13,95% CI = 0.02‐1.02)。停药率(主要由于更年期症状)根据 ERT 的使用情况而不同,对于从未服用 ERT 的女性,3 年和 5 年的依从性分别为 78% 和 75%,而对于基线时未接受 ERT、但在试验期间的某个时间服用 ERT 的女性,3 年和 5 年的依从性分别为 92% 和 88%。药代动力学和药效学(替代终点生物标志物)研究表明,较低剂量的他莫昔芬(例如 5 毫克/天)不会影响药物对心血管和乳腺癌风险的几种生物标志物的活性。因此,我们计划在接受激素替代疗法(HRT)的绝经后健康女性中进行一项多中心安慰剂对照 III 期试验,以测试 HRT 和低剂量他莫昔芬的组合是否保留益处,同时降低任一药物维持高依从率的风险。
Abstract: The Italian Tamoxifen Prevention Study includes 5408 healthy hysterectomized women aged 35‐70 years who have been randomized to 20 mg/day of tamoxifen or placebo for 5 years. After 46 months median follow‐up, an increased risk of venous vascular events (38 women on tamoxifen vs. 18 women on placebo, P= 0.0053), mainly consisting of superficial phlebitis, has been observed and 41 breast cancers have occurred (19 on tamoxifen vs. 22 on placebo, P= 0.64). However, subgroup analyses indicated a borderline significant reduction of breast cancer among women continuously on estrogen replacement therapy (ERT, mostly transdermal) and receiving tamoxifen, with 8 cases of breast cancer among 390 ERT users on placebo versus 1 case among 362 ERT users on tamoxifen (RR = 0.13, 95% CI = 0.02‐1.02). Withdrawal rate (mainly due to menopausal symptoms) differed according to ERT use, with compliance being 78% and 75% at 3 and 5 years, respectively, for women who never took ERT, and 92% and 88% at 3 and 5 years, respectively, for women not on ERT at baseline, but who took ERT at some time during the trial. Pharmacokinetic and pharmacodynamic (surrogate end point biomarkers) studies showed that a lower dose of tamoxifen (such as 5 mg/day) does not affect the drug's activity on several biomarkers of both cardiovascular and breast cancer risk. We are therefore planning a multicenter placebo‐controlled phase III trial in postmenopausal healthy women on hormone replacement therapy (HRT) to test whether the combination of HRT and low‐dose tamoxifen retains the benefits while reducing the risks of either agent maintaining a high compliance rate.
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