帕妥珠单抗在HER-2阳性乳腺癌治疗中的临床转化

帕妥珠单抗(pertuzumab)作为一种新的抗人表皮生长因子受体-2(human epidermal growth factor receptor,HER-2)治疗药物,其作用区域不同于曲妥珠单抗,两者联合可以发挥更全面的HER-2抑制作用,基础和临床转化研究均证实帕妥珠单抗和曲妥珠单抗有协同的抗肿瘤作用.Ⅱ期和Ⅲ期临床转化试验结果显示,抗HER-2两药治疗(帕妥珠单抗+曲妥珠单抗)联合化疗可使HER-2阳性晚期乳腺癌的中位无疾病进展时间(progression-free survival,PFS)延长到18个月以上,中位总生存时间(overall survival,OS)接近5年(56.5个月),显著改善了晚期HER-2阳性乳腺癌患者的预后.两项Ⅱ期新辅助治疗临床转化研究也确认帕妥珠单抗联合曲妥珠单抗的协同作用疗效同样突出,病理完全缓解(pathological complete response,pCR)率最高可达66.2％.安全性分析发现,即使是与蒽环类药物联用,加用帕妥珠单抗治疗也并未增加心脏毒性.本文对帕妥珠单抗在HER-2阳性乳腺癌治疗中的上述相关临床转化研究进行综述.     

曲妥珠单抗与拉帕替尼联合用于乳腺癌新辅助治疗的随机对照研究的 Meta 分析

目的：比较单用曲妥珠单抗与曲妥珠单抗和拉帕替尼两药联合在 HER2阳性乳腺癌新辅助治疗中的有效性和安全性。方法检索 PubMed、MEDLINE、The Cochrane Library、Web of Science、中国期刊全文数据库、万方医药期刊全文数据库和近5年重要国际肿瘤学会议记录,严格按照纳入与排除标准收集 HER2阳性乳腺癌患者使用新辅助化疗联合曲妥珠单抗对比新辅助化疗联合曲妥珠单抗、拉帕替尼双重抗 HER2治疗的有效性和安全性的前瞻性随机对照研究,按 Cochrane 系统评价方法进行质量评价,资料提取后运用 Rev-Man 5.0软件进行 Meta 分析。结果最终纳入4项临床随机对照试验,共779例患者符合条件。Meta分析结果显示,曲妥珠单抗联合拉帕替尼组较单独使用曲妥珠单抗组病理完全缓解率显著升高（53.3%：38.8%, RR =1.39,95%CI 为1.20~1.63,P <0.001）;Ⅲ~Ⅳ级不良反应方面,除了联合组的腹泻发生率更高（25.6%：2.2%,RR =11.54,95%CI 为5.69~23.41,P <0.001）以外,其他差异均无统计学意义。结论在 HER2阳性乳腺癌患者的新辅助治疗中采用新辅助化疗联合曲妥珠单抗、拉帕替尼的双重抗 HER2靶向治疗效果较好,且除了腹泻外并不提高其他不良反应发生率,是一种高效、安全的治疗选择。     

HER2阳性乳腺癌新辅助治疗策略和现状

乳腺癌新辅助治疗是指在手术前进行的全身药物治疗。人表皮生长因子受体2(HER2)阳性乳腺癌预后不良,新辅助治疗为HER2阳性乳腺癌的治疗提供了新型模式,已经彻底改变了其治疗方式和预后。目前曲妥珠单抗和帕妥珠单抗双重抗HER2靶向联合非蒽环类化疗是首选的较高病理完全缓解率（p CR）以及更好预后的新辅助方案之一。未来曲妥珠单抗联合小分子TKI药物,以及新的ADC类药物,免疫治疗联合靶向治疗等,结合可靠生物标志物后,将实现HER2阳性乳腺癌更为精准的治疗。本文就双靶时代的HER2阳性乳腺癌新辅助治疗进行简要综述,并对其未来发展方向进行展望。     

曲妥珠单抗在HER-2阳性乳腺癌患者新辅助治疗中的应用研究进展

曲妥珠单抗是人表皮生长因子受体-2（human epidermal growth factor receptor-2,HER-2）的特异性抑制剂,在HER-2阳性乳腺癌患者新辅助治疗中的应用日益广泛。大规模的随机、对照临床试验证实,新辅助化疗联合曲妥珠单抗与单纯化疗比较能显著提高病理完全缓解（pathologic complete response,pCR）率。在曲妥珠单抗联合化疗的基础上加用拉帕替尼较单用曲妥珠单抗可大大提高pCR率。蒽环与非蒽环类化疗药物均可作为曲妥珠单抗的联合用药,内分泌治疗也可作为雌激素受体阳性患者的联合用药。pCR是曲妥珠单抗新辅助治疗后生存获益的独立预后因素,HER-2转阴而未达到pCR的患者为不良预后因素。本文将对曲妥珠单抗在HER-2阳性乳腺癌患者新辅助治疗中的研究进展进行综述。      

曲妥珠单抗联合新辅助化疗对HER-2阳性乳腺癌患者近远期疗效的影响

目的 探讨曲妥珠单抗联合新辅助化疗对表皮生长因子受体-2(HER-2)阳性乳腺癌患者的疗效.方法 选取HER-2阳性乳腺癌患者58例,随机分为观察组和对照组,各29例.对照组给予表柔比星联合多西他赛的方案进行新辅助化疗,观察组在对照组的基础上给予曲妥珠单抗治疗.比较两组患者的近期、远期疗效.结果 观察组有效率(RR)及病理完全缓解(pCR)率明显优于对照组,5年总生存率(OS)及5年无病生存率(DFS)明显高于对照组.结论 曲妥珠单抗联合新辅助化疗治疗HER-2阳性乳腺癌近期疗效显著,并可有效改善患者预后,值得临床推广应用.     

人表皮生长因子受体2阳性乳腺癌应用新辅助治疗的疗效及影响因素分析

目的 分析人表皮生长因子受体2(HER2)阳性乳腺癌应用新辅助治疗的疗效及影响因素。方法 选取47例HER2阳性乳腺癌患者,均接受曲妥珠单抗和帕妥珠单抗联合紫杉类+卡铂新辅助治疗。比较不同激素受体（HR）表达情况乳腺癌患者的临床特征,HER2阳性乳腺癌患者新辅助治疗总病理学完全缓解（tpCR）的影响因素采用Logistic回归分析。结果 47例HER2阳性乳腺癌患者中,HR阴性19例,HR阳性28例,HR阳性患者年龄≤50岁、月经状态为绝经前比例均明显高于HR阴性患者,乳腺病理学完全缓解（bpCR）率、tpCR率和客观缓解率（ORR）均明显低于HR阴性患者,差异均有统计学意义（P﹤0.01）。47例接受曲妥珠单抗和帕妥珠单抗联合紫杉类+卡铂新辅助治疗患者的tpCR率为70.21%(33/47),单因素分析结果显示,HER2阳性乳腺癌患者新辅助治疗的tpCR可能与雌激素受体（ER）和孕激素受体（PR）表达状态有关（P﹤0.01）;多因素Logistic回归分析结果显示,ER表达情况、PR表达情况均不是HER2阳性乳腺癌患者新辅助治疗tpCR的影响因素（P﹥0.05）。结论曲妥珠单抗和帕妥...     

曲妥珠单抗在乳腺癌新辅助化疗中的应用

人类表皮生长因子受体2(human epidermal growth factor receptor 2,HER-2)蛋白在20%~25%的乳腺癌患者中呈过度表达状态,其过表达与肿瘤侵袭性强、复发率高和死亡率高密切相关。曲妥珠单克隆抗体(简称曲妥珠单抗)作为人源化抗HER-2单抗,通过多种机制表现出其对乳腺癌具有较好的疗效。目前,曲妥珠单抗已被常规应用于乳腺癌患者的手术后辅助化疗或转移性乳腺癌的治疗。手术前应用新辅助曲妥珠单抗联合化疗也可使HER-2阳性的乳腺癌患者从中受益,本文对此类新辅助化疗的疗效及不良反应进行了总结分析。     

曲妥珠单抗获得性耐药机制及应对策略

摘 要：曲妥珠单抗是靶向人表皮生长因子2(HER2)的单克隆抗体药物,对HER2表达阳性乳腺癌及胃癌治疗效果确切。然而多数患者在用药1年内出现了获得性耐药,导致其疗效降低甚至无效。研究表明,信号通路异常激活;表皮生长因子受体(EGFR)及其配体异常表达及肿瘤诱发上皮—间质转化(EMT)均可成为曲妥珠单抗耐药的重要机制,联合使用PI3K/AKT/mTOR通路抑制剂及其相关生存信号通路抑制剂可逆转曲妥珠单抗耐药。本文就曲妥珠单抗耐药机制及逆转耐药策略进行综述。     

曲妥珠单抗治疗141例人表皮生长因子受体2阳性乳腺癌的回顾性分析

目的 总结曲妥珠单抗在人表皮生长因子受体2(Her-2)阳性乳腺癌患者新辅助、辅助和复发转移治疗中的临床应用经验,评价其与化疗联用的疗效.方法 对2004年1月至2008年12月门诊应用曲妥珠单抗治疗的141乳腺癌患者进行回顾性分析.随访时间为3～319个月.分析患者的无病生存时间(DFS),比较患者辅助、复发转移一线及二线使用曲妥珠单抗治疗的总生存时间(OS)、治疗失败时间(TTF)和临床有效率的差异.结果 与曲妥珠单抗治疗联用的新辅助化疗中,紫杉醇联合卡铂方案占66.7%;辅助治疗中,蒽环类和蒽环类序贯紫杉类方案占53.9%.复发转移的患者治疗后中位DFS为17个月.复发转移的患者经一线曲妥珠单抗联合化疗治疗后,临床总有效 率为84.5%,中位TTF为24个月;二线治疗有效率为44.4%,中位TTF为5个月.两者比较,差异有统计学意义(P=0.002).结论 紫杉醇和卡铂化疗联合曲妥珠单抗,值得在新辅助治疗中推广,紫杉类和蒽环类联合或序贯靶向治疗仍是辅助治疗的标准方案.转移性乳腺癌一线应用曲妥珠单抗联合化疗比二线治疗的临床有效率更高,在继续应用曲妥珠单抗的基础上改用化疗方案,可提高治疗有效率,减少治疗失败的概率.     

曲妥珠单抗治疗后进展的转移性乳腺癌继续曲妥珠单抗治疗的疗效及安全性分析

目的：评价曲妥珠单抗治疗后进展的转移性乳腺癌患者继续行曲妥珠单抗治疗的疗效及安全性。方法回顾性分析曲妥珠单抗治疗过程中出现疾病进展,继续行曲妥珠单抗治疗,仅更换化疗方案的30例HER2阳性转移性乳腺癌患者的临床资料,并评价疗效及不良反应。结果30例HER2阳性转移性乳腺癌患者,均在复发转移阶段接受过曲妥珠单抗治疗,中位治疗时间6.0个月（95%CI为1.7~10.3个月）;30例患者在出现疾病进展后,均继续进行曲妥珠单抗治疗,仅更换联合的化疗方案。30例患者均可评价疗效,其中部分缓解（PR）7例（23.3%）,疾病稳定（SD）12例（40.0%）,疾病进展（PD）11例（36.7%）,无完全缓解（CR）患者。客观缓解率为23.3%,临床获益率为43.3%。总无进展生存期（PFS）为5.0个月（95%CI为3.0~7.0个月）。有临床获益的13例患者的PFS明显长于17例无临床获益者（9.0个月vs 3.0个月,P﹤0.001）。最常见的不良反应为血液学不良反应,考虑主要与化疗药物相关。结论对于曲妥珠单抗治疗过程中出现疾病进展的患者,继续使用曲妥珠单抗,更换化疗方案有较好的临床获益。     

曲妥珠单抗和帕妥珠单抗联合不同化疗方案新辅助治疗HER-2阳性乳腺癌真实世界疗效及安全性观察

目的：比较曲妥珠单抗和帕妥珠单抗（trastuzumab plus pertuzumab,HP）联合紫杉类+铂类（TCbHP）、紫杉类单药（THP）、蒽环类序贯紫杉类（AC-THP）三种化疗方案在真实世界临床实践中新辅助治疗HER-2阳性乳腺癌的疗效、安全性及耐受性。方法：回顾性分析2019年6月至2021年12月于保定市第一中心医院等河北省共11家三级甲等医院接受三种方案新辅助治疗并完成后续手术的180例HER-2阳性乳腺癌患者的临床病理资料,其中TCbHP组78例、THP组70例、AC-THP组32例,比较三种治疗方案的疗效、安全性及耐受性,并采用统计学方法分析临床病理因素对总体病理完全缓解（total pathologic complete response,tpCR）率的影响。结果：总人群tpCR率为58.9%(106/180)。TCbHP组的tpCR率为64.1%(50/78),高于THP组的54.3%(38/70)和AC-THP组的56.3%(18/32),差异无统计学意义（P=0.454）。TCbHP组的3级及以上不良反应发生率为12.8%(10/78),高于THP组的4...     

新辅助化疗联合双靶治疗HER-2阳性乳腺癌的有效性比较

  目的  比较多西他赛+卡铂+曲妥珠单抗+帕妥珠单抗（TCbHP）、多西他赛+曲妥珠单抗+帕妥珠单抗（THP）与蒽环类+环磷酰胺序贯紫杉类+曲妥珠单抗+帕妥珠单抗（AC-THP）作为新辅助治疗方案对HER-2阳性激素受体（hormone receptor,HR）阳性和HER-2阳性HR阴性乳腺癌患者的有效性。  方法  回顾性分析2019年6月至2022年12月于天津医科大学肿瘤医院就诊的408例HER-2阳性且行标准新辅助治疗的乳腺癌患者的临床病理资料,根据HR状态分为HER-2阳性HR阳性组 211例、HER-2阳性HR阴性组197例。根据不同新辅助治疗方案进一步分为TCbHP、THP和AC-THP组,分别比较各组患者行各治疗方案的病理学完全缓解（pathological complete response,pCR）率 。  结果  HER-2阳性HR阳性乳腺癌患者中,TCbHP、THP和AC-THP组的pCR率分别为43.1%（69/160）、36.0%（9/25）和 38.5%（10/26）,各组间比较差异无统计学意义（χ²=0.580,P=0.748）;HER-2阳性HR阴性患者中,TCbHP、THP和AC-THP组的pCR率分别为85.5%（94/110）、57.3%（43/75） 和 66.7%（8/12）,TCbHP组与THP组比较差异具有统计学意义（χ²=19.967,P<0.001）。  结论  TCbHP、THP和AC-THP新辅助治疗方案对HER-2阳性HR阳性乳腺癌患者的疗效相似,TCbHP作为新辅助治疗对HER-2阳性HR阴性乳腺癌疗效更优。     

乳腺癌新辅助化疗后同侧内乳区淋巴结病理完全缓解的预测因素及预后价值

目的 探讨乳腺癌新辅助化疗后内乳区淋巴结病理完全缓解（ipCR）的预测因素及其对预后的影响。方法 对70例伴内乳区淋巴结转移的原发乳腺癌并接受新辅助化疗患者病例资料进行回顾性分析,根据术后病理分为ipCR组和non-ipCR组。对乳腺癌新辅助化疗后同侧ipCR的预测因素,χ 2检验、Fisher及Logistic回归分别进行单因素和多因素分析,Kaplan-Meier曲线和Cox回归进行预后分析。结果 70例患者中31例获得ipCR（44.3%）。单因素分析显示,腋窝pCR、激素受体表达水平、HER2状态与ipCR有关（P<0.05）。多因素分析显示,年龄、腋窝pCR、HER2状态是ipCR的独立预测因子。ipCR组平均DFS达96.0个月（95%CI: 49.5~84.7）,明显优于non-ipCR组为67.1个月（95%CI: 81.7~110.3, P<0.05）。ipCR组复发转移风险较non-ipCR组降低87%（HR=0.13, 95%CI: 0.04~0.44, P<0.01）。ipCR、Ki67表达水平、乳房pCR是影响患者预后的独立因素。结论 新辅助化疗后是否获得ipCR与临床病理因素存在相关性。ipCR可用于预测内乳区淋巴结转移患者的预后。     

Association between HER2 status and response to neoadjuvant anthracycline followed by paclitaxel plus carboplatin chemotherapy without trastuzumab in breast cancer

Background

We recently showed HER2-positive breast cancers are less likely to respond to neoadjuvant anthracycline chemotherapy. Here, we investigated whether HER2-positive breast cancers responded to sequential neoadjuvant anthracycline followed by paclitaxel plus carboplatin regimen in the absence of trastuzumab.

Methods

Women (n=372) with operable primary breast cancer initially received two cycles of neoadjuvant anthracyclines, the clinical tumor response was assessed, then patients were received four cycles of paclitaxel plus carboplatin regimen. All the patients did not received trastuzumab treatment in the neoadjuvant setting. HER2 status was determined by immunohistochemistry and/or by fluorescence in situ hybridization in core-biopsy breast cancer tissue obtained before the neoadjuvant chemotherapy.

Results

Eighteen percent (67/372) of patients achieved a pathologic complete response (pCR) in their breast. HER2-positive tumors had a significant higher pCR rate than HER2-negative tumors (33.0% versus 13.5%, P<0.001) in this cohort of 372 patients, and positive HER2 status remained an independent favorable predictor of pCR in a multivariate analysis [odds ratio (OR), 2.26; 95% confidence interval (CI), 1.18 to 4.36, P=0.015]. Furthermore, patients who responded to initial anthracycline regimens were more likely to respond to paclitaxel plus carboplatin than patients who did not (pCR, 27.2% versus 14.6%, P=0.005). Patients with HER2-positive tumors exhibited a significant higher pCR rate than did patients with HER2-negative tumors in both anthracycline response group (40.5% versus 20.0%, P=0.025) and anthracycline non-response group (28.3% versus 11.3%, P=0.002).

Conclusions

Under the circumstance of no trastuzumab treatment, women with HER2-positive cancers derive a large benefit from paclitaxel-carboplatin-based neoadjuvant chemotherapy.     

Changes in tumor expression of HER2 and hormone receptors status after neoadjuvant chemotherapy in 21 755 patients from the Japanese breast cancer registry

BackgroundWe investigate rates of pathologic complete response (pCR) and tumor expression of ER, PgR, HER2 discordance after neoadjuvant chemotherapy using Japanese breast cancer registry data.Patients and methodsRecords of more than 300 000 breast cancer cases treated at 800 hospitals from 2004 to 2013 were retrieved from the breast cancer registry. After data cleanup, we included 21 755 patients who received neoadjuvant chemotherapy and had no distant metastases. pCR was defined as no invasive tumor in the breast detected during surgery after neoadjuvant chemotherapy. HER2 overexpression was determined immunohistochemically and/or using fluorescence in situ hybridization.ResultspCR was achieved in 5.7% of luminal tumors (n = 8730), 24.6% of HER2-positive tumors (n = 4403), and 18.9% of triple-negative tumors (n = 3660). Among HER2-positive tumors, pCR was achieved in 31.6% of ER-negative tumors (n = 2252), 17.0% of ER-positive ones (n = 2132), 31.4% of patients who received trastuzumab as neoadjuvant chemotherapy (n = 2437), and 16.2% of patients who did not receive trastuzumab (n = 1966). Of the 2811 patients who were HER2-positive before treatment, 601 (21.4%) had HER2-negative tumors after neoadjuvant chemotherapy, whereas 340 (3.4%) of the 9947 patients with HER2-negative tumors before treatment had HER2-positive tumors afterward. Of the 10 973 patients with ER-positive tumors before treatment, 499 (4.6%) had ER-negative tumors after neoadjuvant chemotherapy, whereas 519 (9.3%) of the 5607 patients who were ER-negative before treatment had ER-positive tumors afterward.ConclusionWe confirmed that loss of HER2-positive status can occur after neoadjuvant treatment in patients with primary HER2-positive breast cancer. We also confirmed that in practice, differences in pCR rates between breast cancer subtypes are the same as in clinical trials. Our data strongly support the need for retest ER, PgR, HER2 of surgical sample after neoadjuvant therapy in order to accurately determine appropriate use of targeted therapy.     

HER2 and response to anthracycline-based neoadjuvant chemotherapy in breast cancer

BackgroundThe predictive role of human epidermal growth factor receptor 2 (HER2) to adjuvant anthracycline-based chemotherapy remains controversial. Here, we investigated the association between HER2 status and pathological response in breast cancer patients who received neoadjuvant anthracycline-based regimens.Patients and methodsWomen (n = 538) with operable primary breast cancer received neoadjuvant anthracycline-based chemotherapy. Pathological complete response (pCR) was defined as no invasive breast tumor cells in breast after completion of neoadjuvant chemotherapy. HER2 status was determined by immunohistochemistry and/or by fluorescence in situ hybridization in core biopsy breast cancer tissue obtained before initiation of neoadjuvant chemotherapy.ResultsIn this cohort of 538 patients, 23.9% of patients achieved a pCR in their breast. HER2-positive tumors had a lower rate of pCR than did HER2-negative tumors (14.7% versus 25.7%, P = 0.013); negative HER2 status remained as an independent favorable predictor of pCR after adjusted for age, estrogen receptor, progesterone receptor, tumor size, chemotherapy cycles, and tumor grade in a multivariate analysis (odds ratio = 3.14; 95% confidence interval = 1.60–6.16, P = 0.001). Furthermore, patients with a pCR had a higher 3-year disease-free survival (DFS) rate than did patients without a pCR (P = 0.007).ConclusionWomen with HER2-negative breast cancers rather than HER2-positive tumors benefit from anthracycline-based neoadjuvant chemotherapy.     

局部进展期直肠癌新辅助化疗后病理完全缓解及肿瘤降期的预测因素分析

目的:探索局部进展期直肠癌(LARC)经新辅助化疗后病理完全缓解（pCR）和肿瘤降期（ypT0-1）的预测因素。方法:回顾性分析71例经新辅助化疗后进行全直肠系膜切除术的局部进展期直肠癌患者的临床资料,分析其临床特征,筛选经新辅助化疗后达到pCR及肿瘤降期（ypT0-1）的预测因子。结果:单因素分析结果显示肿瘤占肠腔＜1/2周（P＜0.001）、基线CEA≤5 ng/mL（P=0.001）、基线临床N分期为N0期（P=0.019）以及新辅助治疗2周期后影像评估为缓解（P=0.002）与直肠癌新辅助化疗后的高pCR率有关;肿瘤占肠腔＜1/2周（P＜0.001）、基线CEA≤5 ng/mL（P=0.029）以及新辅助治疗2周期后影像评估为缓解（P=0.007）与直肠癌新辅助化疗后的高肿瘤降期率（ypT0-1）有关。多因素Logistic回归分析结果显示,肿瘤占肠腔环周大小（P=0.013）、基线CEA水平（P=0.042）以及基线临床N分期（P=0.038）是影响直肠癌新辅助化疗后pCR的独立预测因子;肿瘤占肠腔环周大小（P=0.001）是影响直肠癌新辅助化疗后肿瘤降期（ypT0-1）的独立预测因子。结论:初始诊断时肿瘤占肠腔环周大小、基线CEA水平及淋巴结是否阳性对局部进展期直肠癌新辅助化疗后pCR有预测作用,肿瘤占肠腔环周大小对局部进展期直肠癌新辅助化疗后肿瘤降期（ypT0-1）有预测作用。     

MRI predicts pathologic complete response in HER2-positive breast cancer after neoadjuvant chemotherapy

Background

Neoadjuvant treatment of HER2-positive breast cancer frequently leads to a pathologic complete response (pCR), which is associated with favourable long-term outcome. Treatment regimens typically consist of 6–9 cycles of trastuzumab-based chemotherapy, although many patients achieve early radiologic complete response (rCR). If rCR accurately predicts pCR, the number of chemotherapy cycles can possibly be reduced.

Methods

We performed a diagnostic accuracy study to determine the association between rCR and pCR in patients with stage II–III HER2-positive breast cancer treated with neoadjuvant trastuzumab-based chemotherapy at the Netherlands Cancer Institute. RCR was defined as the disappearance of pathologic contrast enhancement in the original tumour region on repeated magnetic resonance imaging (MRI). PCR was defined as the absence of invasive tumour cells in the resected breast specimen (ypT0/is). Diagnostic accuracy was estimated in the overall population and in subgroups based on hormone receptor (HR) status. The prognostic value of rCR for recurrence-free interval was evaluated as an exploratory analysis.

Results

We identified 296 eligible patients with 297 HER2-positive tumours (154 HR-negative and 143 HR-positive) treated with neoadjuvant trastuzumab-based chemotherapy between 2004 and 2016. Overall, the rCR rate was 69% (206/297) and the pCR rate was 61% (181/297). Among 206 patients with rCR, 150 also had pCR (negative predictive value [NPV] = 150/206 = 73%). Among 91 patients without rCR, 60 had residual tumour at pathology (positive predictive value [PPV] = 60/91 = 66%). The NPV was better in HR-negative compared to HR-positive tumours (88 vs. 57%), while the PPV was better in HR-positive tumours (50 vs. 78%). Achieving rCR was associated with a 5-year recurrence-free interval of 88% compared to 68% without rCR (hazard ratio 0.34, 95% confidence interval 0.17–0.65, P = 0.001).

Conclusion

Achieving rCR corresponds well with pCR in HER2-positive breast cancer, particularly in the HR-negative subgroup. RCR is also associated with improved long-term outcome.

     

Dual HER2-blockade with pertuzumab and trastuzumab in HER2-positive early breast cancer: a subanalysis of data from the randomized phase III GeparSepto trial

BackgroundThe neoadjuvant phase III GeparSepto study showed that substituting nab-paclitaxel for standard solvent-based paclitaxel significantly improved the pathologic complete response (pCR) rate achieved with a sequential neoadjuvant chemotherapy regimen of paclitaxel, epirubicin, and cyclophosphamide for high-risk primary breast cancer. Recent trials demonstrated that in HER2+ breast cancer pCR can be increased by using pertuzumab in addition to trastuzumab and chemotherapy. The present analysis focuses on efficacy and safety data from the subset of patients with HER2+ tumors from the GeparSepto trial (n = 396) in comparison to the HER2- cohort.Patients and methodsPatients with histologically confirmed breast cancer (n = 1206) received four cycles of weekly paclitaxel [either solvent-based (Pac) or nab-paclitaxel (nab-Pac), according to randomization] followed by 4 cycles of epirubicin 90 mg/m² plus cyclophosphamide 600 mg/m² q3w, with concurrent trastuzumab and pertuzumab q3w for those with HER2+ tumors. The primary endpoint was pCR defined as ypT0 ypN0.ResultsHigher rates of pCR were achieved in HER2+ than in HER2- tumors (57.8% versus 22.0%,P < 0.0001), with the highest rate in the HER2+/HR- cohort (71.0%; 66.7% Pac, 74.6% nab-Pac). In HER2+/HR+ tumors, the pCR rate was 52.9% (49.7% Pac, 56.4% nab-Pac). Grade ≥3 toxic effects were significantly more common in HER2+ than in HER2- patients, with grade 3–4 diarrhea in 7.6% versus 0.9% (P < 0.001) and febrile neutropenia in 6.3% versus 3.3% (P = 0.023) of patients. Left ventricular ejection fraction decreases from baseline were uncommon, with 2.0% versus 0.4% of patients showing decreases to <50% along with a ≥10% decrease from baseline.ConclusionIn HER2+ early breast cancer, a dual HER2-targeted combination of pertuzumab and trastuzumab, together with taxane–epirubicin–cyclophosphamide neoadjuvant chemotherapy, achieved high rates of pCR.