IMPAKT 2013:遗传检测技术用于乳腺癌复发风险预测还需时日

2013-05-20 IMPAKT dxy

IMPAKT 2013乳腺癌大会上公布的两项回顾性分析结果显示,两种基因检测方法均有助于雌激素受体阳性乳腺癌患者远期结局的预后评估。 维也纳大学外科教授Michael Gnant博士说,这些最新的研究结果意味着全部3项不同的基因检测方案在回顾性分析中显示出额外的预后可靠性,同时也推动这一领域离真正意义的常规实践更近了一步。对于雌激素受体阳性、淋巴结阴性乳腺癌患者人群,这些方案有助于区分出那些转移

IMPAKT 2013乳腺癌大会上公布的两项回顾性分析结果显示,两种基因检测方法均有助于雌激素受体阳性乳腺癌患者远期结局的预后评估。

维也纳大学外科教授Michael Gnant博士说,这些最新的研究结果意味着全部3项不同的基因检测方案在回顾性分析中显示出额外的预后可靠性,同时也推动这一领域离真正意义的常规实践更近了一步。对于雌激素受体阳性、淋巴结阴性乳腺癌患者人群,这些方案有助于区分出那些转移性疾病长期风险低,在5年激素疗法后可安全停止治疗的患者,因此这些检测方案的部分有效性得到证实。

但其他专家却强调,这项技术还不成熟,目前尚不能常规使用。

在会议期间,德克萨斯大学M.D. Anderson 癌症中心的病理学教授Symmans博士说,“总有一天我们可以为患者提供一种基因组检测方案,这种方案的有效性和可靠性都是经临床验证证实过的,”但是,他补充道,在肿瘤学家接受常规检测之前,“我们需要在多个实验室里验证方案本身及此种情境下检测工作本身的可重复性。”

维也纳大学外科教授Peter C. Dubsky博士及其合作者Gnant博士强调,三种遗传检验方案的设计目的均不是出于预测远期复发风险,“在实际考虑5年后的辅助性内分泌治疗方案决策纳入上述检测方案之前,这些试验数据还需要得到进一步的验证,” Dubsky博士在一项声明中这样写道。

由Gnant博士和Dubsky博士报告的研究中分析了来自奥地利乳腺癌和结直肠癌研究组(ABCSG) 8研究中共1478例患者的福尔马林固定、石蜡包埋肿瘤组织样本。上述研究的主要目的是在超过3,700例雌激素受体阳性乳腺癌绝经后女性中评估两种不同的5年治疗方案(J. Clin. Oncol. 2012;30:722-8)。

Gnant博士和Dubsky博士及他们的同事应用58-基因分类方案(PAM50),通过微阵列检测预测分析方法评估1,478份样本。该检测方法于2009年(J. Clin. Oncol. 2009;27:1160-7)首次被报道,此后在欧洲上市销售,商品名为Prosigna,但未进入美国市场。

Gnant博士报道称,在试验中,研究人员利用PAM50结果的预定切入点将患者分为远期远端复发低危、中危和高危患者,并计算这些患者人群在中位随访11年内的实际复发率。他们发现,低危、中危和高危患者的15年无病生存率分别为97.6%、90.9%和82.5%,组间差异有统计学意义。

这些结果提示,高危患者可能是长期辅助治疗的较好候选人群,而低危患者在经初始治疗后5~10年和10~15年的复发风险低于2%,因此作者表示,没有必要接受可带来副作用的长期辅助治疗。PAM50复发风险评分“在已确立的临床病理学因素基础上提供了额外的预后信息。”

大会报道的第二项回顾性分析收集了来自瑞宁得、他莫昔芬单用或联用(ATAC)研究中的超过6,000例局部浸润性乳腺癌绝经后女性的医疗记录和标本(Lancet Oncology 2008;9:45-53)。研究者评估了5种不同临床、基因或生化检测方法预测其中891例患者中位随访10年内远端复发风险的有效性。

伦敦大学的统计学家和流行病学家Ivana Sestak博士称,试验结果表明,对于的随访最初5年内的预后信息,所有5种方案得出的评估结果相似。在后来的5年内,临床治疗评分方案得出了最强预后信息,该评分方案综合考虑了患者的淋巴结状况、肿瘤级别和大小、患者年龄和所接受的治疗,其中最重要的2个预后特征分别是肿瘤大小和淋巴结状况。对于随访5~10年内的远端复发情况,PAM50遗传检测和乳腺癌指数这两种评估方法也提供的额外预测信息同样具有统计学意义和临床意义(Br. J. Cancer 2011;104:1762-9)。

Sestak博士和他的同事评估的其他两种方案则未能在临床治疗评分基础上提供额外预后信息,这两种评估方案分别为一种含有4个免疫生化标志物(雌激素、孕酮、HER2和ki67标志物)的评估方案和Oncotype Dx复发评分方案,后者则是由Genomic Health公司销售的21-基因检测方案。她总结道,“PAM50复发风险评分和乳腺癌指数可用于识别迟发性复发风险增加并且可从超过5年的长期辅助激素治疗中获益的雌激素受体阳性乳腺癌患者。但开发这些评分的目的并非为了指导治疗。”

Gnant博士说,这些发现连同ABCSG 8研究中的PAM50分析方案共同巩固了PAM50作为预后工具的地位。除了PAM50和乳腺癌指数之外,近期出现的第三种基因检测方法EndoPredict,也被证实可在相似患者人群中有效地预测远期复发风险(Ann. Oncol. 2013;24:640-7)。Symmans博士说,所有三种检测方案的有效性均需要在内分泌敏感性、淋巴结阴性乳腺癌患者人群中做长期预后验证。该会议由欧洲肿瘤医学会资助。

接下来:在不同实验室中验证其可重复性

德克萨斯大学休斯敦M.D.安德森癌症中心的病理学教授W. Fraser Symmans博士表示,开发乳腺癌指数、PAM50和EndoPredict检测方案的目的均是作为结局预测工具使用,三者的设计目的既不是预测患者对内分泌治疗的敏感性,也不是帮助选择某类内分泌药物用于治疗,而且现有研究也未发现这些检测方案具有这些功能。虽然存在上述局限性,但相关数据表明这3种检测方案在激素受体阳性、淋巴结阴性乳腺癌患者中区分复发风险的能力较好。目前尚无明确证据显示这些检测方案能够预测淋巴结阳性患者的结局。

5年后最可能停止治疗的是合并有HER2阴性疾病和1~2级疾病的患者,这类患者与ABCSG 8研究中的受试患者相似。这些检测方法的诱人之处还在于它们可在当地病理实验室进行,也就不需将标本送至距离较远的检测中心。病理学领域还需要等待相当长的时间才能完全步入基因组学诊断或个体化治疗的时代。

下一步需证实这些检测方法在不同实验室中的可重复性,以确保质量控制,预计可在明年完成。实验室工作连同检测方案本身都需要确定一个临界质量标准,以保证每个人都可以拿到临床有效且可重复的结果。希望在未来一年中可实现这些目标。

Genetic tests gauge breast-cancer recurrence risk
BRUSSELS – A pair of genetic tests each showed the ability to aid long-term prognosis estimates in patients with estrogen receptor–positive breast cancer, based on results from two retrospective analyses reported at IMPAKT 2013 Breast Cancer Conference.
The new results mean that a total of three different genetic tests have now shown added prognostic utility in retrospective analyses, bringing the field closer to actually using these tests in routine practice. The tests would prove particularly useful for patients with estrogen receptor–positive, node-negative breast cancer by helping to find those who are at low risk for long-term metastatic disease and who could safely stop treatment after 5 years of hormonal therapy, said Dr. Michael Gnant, professor of surgery at the University of Vienna.
But other experts stressed that it’s premature to start routinely using these tests.
"We’re getting to a point where we can offer to our patients genomic assays that are clinically validated and with demonstrated utility," Dr. W. Fraser Symmans said during the meeting. But, he added, while oncologists are "on the brink" of using the tests routinely, "we need to confirm reproducibility among labs, and that the test works in that setting," said Dr. Symmans, professor of pathology at the University of Texas M.D. Anderson Cancer Center in Houston.
None of the three genetic test panels were designed to predict late recurrences, noted Dr. Peter C. Dubsky, a surgeon at the University of Vienna and a collaborator with Dr. Gnant. "These data will need further validation before actually being incorporated into clinical decision-making concerning adjuvant endocrine therapy beyond 5 years," Dr. Dubsky said in a written statement...

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    2014-02-08 xfpan20
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