卵巢癌是一种高度异质性的妇科恶性肿瘤,其早期诊断困难,缺乏准确筛查方法,患者预后较差,生存率低。卵巢癌的分子异质性是当前研究的重点之一。卵巢癌主要分为上皮性卵巢癌(EOC)、生殖细胞卵巢癌和性索间质卵巢癌,其中上皮性卵巢癌占90%以上,而浆液性卵巢癌(SOC)是上皮性卵巢癌的主要类型,进一步分为高级别浆液性卵巢癌(HGSOC)和低级别浆液性卵巢癌(LGSOC)。HGSOC占EOC病例的70%以上,LGSOC约占10%。两者在临床过程、治疗方法和预后方面存在显著差异。HGSOC通常具有较高的侵袭性和较差的预后,而LGSOC则表现出较长的生存期和较高的化疗耐药性。
近年来,国内外学者在卵巢癌的分子机制、诊断标志物及治疗策略方面进行了广泛研究,取得了一定进展。研究表明,HGSOC中TP53基因的突变率超过90%,而LGSOC中TP53突变率较低,提示两者在分子机制上存在显著差异[1-3]。TP53信号通路在卵巢癌中的作用备受关注。TP53是一种重要的肿瘤抑制基因,其突变或缺失会导致细胞增殖失控,进而促进肿瘤的发生和发展。研究发现,TP53突变与卵巢癌的多药耐药性和腹腔转移密切相关[4]。此外,TP53的调控网络复杂,涉及多个下游基因,如TP53诱导蛋白3(TP53I3)和铁氧还蛋白还原酶(FDXR)。TP53I3在DNA损伤修复和细胞凋亡中发挥重要作用,其缺失会导致基因组不稳定性和药物敏感性增加[5]。FDXR则通过调控铁代谢和TP53表达,抑制肿瘤细胞的增殖[5]。这些研究为开发针对TP53信号通路的治疗策略提供了理论基础。肿瘤微环境(TME)在卵巢癌进展中的作用也逐渐被揭示。肿瘤微环境中的免疫细胞、细胞外基质和信号分子共同影响肿瘤的生长、侵袭和转移。研究发现,趋化因子信号通路在卵巢癌的免疫逃逸和肿瘤进展中发挥重要作用。例如,CXCL11作为一种趋化因子,在LGSOC中高表达,并与较好的预后相关,提示其在抗肿瘤免疫中的作用[6, 7]。此外,EGFR信号通路的异常激活与卵巢癌的侵袭和转移密切相关,靶向EGFR的治疗策略正在被广泛研究[8-10]。
在卵巢癌治疗方面,传统的化疗和手术虽然仍是主要的治疗手段,但耐药性问题日益突出且预后较差。近年来,靶向治疗和免疫治疗成为研究热点。例如,PARP抑制剂在BRCA突变型卵巢癌中显示出显著的疗效[11]。而基于肿瘤微环境的免疫治疗策略,如免疫检查点抑制剂和CAR-T细胞疗法,也在临床试验中取得了一定进展[12]。
卵巢癌的分子异质性、信号通路调控的研究为理解其发病机制和开发新的治疗策略提供了重要线索。为了进一步探索不同亚型卵巢癌的检测靶点及鉴别诊断,开发精准的诊断标志物和治疗靶点,我们前期通过KEGG等手段对HGCOC和LGSOC的差异基因进行筛选和统计,发现有20个核心基因与浆液性卵巢癌及其预后有关。接下来我们将会进一步进行基因表达验证、差异基因功能验证等实验,以验证HGSOC与LGSOC的差异分子特征及关键基因,进而预测药物靶点,为浆液性卵巢癌的快速分型、预后评估和治疗提供指导和理论支撑。
图1:HGSOC和LGSOC基因表达差异 A:HGSOC核心通路变化;B:LGSOC核心通路变化
本图由Figdraw绘制
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