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2015年ASCO年會于5月29日—6月2日在美國芝加哥召開。5月30日下午消化系統(tǒng)(結(jié)直腸)腫瘤口頭報告專場上,一項來自PETACC8和N0147試驗3934例患者的匯總分析顯示了,BRAF V600E與KRAS外顯子2突變對經(jīng)輔助FOL**+/-西妥昔單抗治療,微衛(wèi)星穩(wěn)定(MMS),III期結(jié)腸癌患者的預(yù)測價值。
既往發(fā)表的研究因混雜了II期與III期,微衛(wèi)星不穩(wěn)定性(MSI)和MSS,結(jié)腸癌與直腸癌,治療方案不固定等情況,BRAF和KRAS基因突變對術(shù)后結(jié)腸癌患者的預(yù)后影響尚存爭議。因此,本項研究前瞻性從接受FOL**+/-西妥昔單抗輔助治療的III結(jié)腸癌患者中收集生物標志。
研究方法:
研究人員對腫瘤BRAF V600E和KRAS外顯子2基因突變進行分析,僅將MSS患者納入組。將這些入組患者分為BRAF突變,KRAS突變,和雙重野生型(WT)三組。采用一致性結(jié)果評估指標,在全組和各亞組中評估預(yù)后影響,然后將所有數(shù)據(jù)匯總。采用分層Cox比例風險模型對基因突變與復(fù)發(fā)間期(TTR),復(fù)發(fā)后生存期(SAR),和總生存期(OS)相關(guān)性進行分析。多變量模型對治療和協(xié)變量(年齡,性別,腫瘤分級,T/N分期,腫瘤部位,ECOG PS)進行了校正。
研究結(jié)果:
一共入組5577例,僅對3934例MSS患者評估BRAF和KRAS基因;其中279例BRAF突變,1450例KRAS突變,以及2205例雙重WT.與WT組不同,突變兩組的TTR和OS較短,且多因素分析也證實該結(jié)果(表)。WT組,KRAS突變組,BRAF突變組的中位SAR分別為2.57,2.09和1.0年,其中KRAS(HR:1.20-95%CI:1.01-1.44,P<0.0001),BRAF突變組(HR:3.01-95%CI:2.32-3.93,P<0.0001)。本項研究中治療(聯(lián)合或不聯(lián)合西妥昔單抗)和KRAS/BRAF雙突變的TTR(P值=0.38)和OS(P值=0.16)無明顯差異。
結(jié)論:
本項研究通過一項大型III期術(shù)后結(jié)腸癌接受FOL**輔助治療試驗的匯總分析,發(fā)現(xiàn)BRAF V600E或KRAS 外顯子2,包括密碼子12或13突變,是TTR,SAR和OS的***預(yù)測因子。在以后的臨床試驗輔助試驗中應(yīng)將這些突變納入為重要分層因素。
會議專題》》》2015年ASCO年會專題報道
Prognostic value of BRAF V600E and KRAS exon 2 mutations in microsatellite stable (MSS), stage III colon cancers (CC) from patients (pts) treated with adjuvant FOL**+/- cetuximab: A pooled **ysis of 3934 pts from the PETACC8 and N0147 trials.(Abstract 3507)Authors:Julien Taieb, Karine Le Malicot,et al.
Session Type:Oral Abstract Session
Background: The prognostic value of BRAF and KRAS mutations in resected CC pts remains controversial due to published studies that include stage II & III, microsatellite instability (MSI) and MSS, colon and rectal tumors, and variable treatment regimens. We examined this question in prospectively collected biospecimens from MSS stage III CC pts receiving adjuvant FOL** +/- cetuximab.
Methods:Tumors were **yzed for BRAF V600E and KRAS exon 2 mutations, only MSS tumors were included. Three groups were defined: BRAF Mutant, KRAS Mutant and double wild-type (WT)。 The **ytic strategy estimated study- and arm-specific prognostic effects to assess homogeneity of results, and then **ysis of pooled data. Associations of mutations with time-to-recurrence (TTR), survival after relapse (SAR) and overall survival (OS) were **ysed using a stratified Cox proportional hazards model. Multivariate models were adjusted for treatment and covariates (age, sex, tumor grade, T/N stage, tumor location, ECOG PS)。
Results:Of the 5,577 pts enrolled, 3,934 tumors were MSS and evaluable for BRAF and KRAS; 279 pts were BRAF Mutant, 1,450 KRAS Mutant, and 2,205 WT. Both mutations were linked to shorter TTR and OS vs WT, and results were confirmed in multivariate **yses (table)。 Median SAR was 2.57, 2.09 and 1.0 year in WT, KRAS Mutant (HR: 1.20- 95%CI: 1.01-1.44, p < 0.0001) and BRAF mutant (HR: 3.01-95%CI: 2.32-3.93, p < 0.0001), respectively. No interaction was found between treatment (with or without cetuximab) and KRAS/BRAFmutations for TTR (p = 0.38) or OS (p = 0.16)。
Conclusions:In a large pooled **ysis of pts with resected stage III MSS colon cancers receiving adjuvant FOL**, BRAFV600E or KRAS exon 2 mutations, including codons 12 or 13, are independent predictors of significantly shorter TTR, SAR and OS. Future clinical trials in the adjuvant setting should consider these mutations as important stratification factors.
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