Triple-negative breast cancer (TNBC), with a lack expression of ER, PR, and HER-2 as potential treatment targets, is insensitive to the hormonal and trastuzumab therapies. Thus, local and regional treatment, such as radiotherapy is placed with more emphasis when treating TNBC patients. In the current study, expression profiles of mRNAs and long noncoding RNAs (lncRNAs) in TNBC patients, who received radiotherapy in our institute, was investigated to develop radiation-related gene signatures to facilitate individualized TNBC treatment. Specifically, 44 TNBC samples including 14 recurrences and 30 non-recurrences after radiotherapy were analyzed by using transcriptome microarrays. A total of 626 mRNAs were identified as differentially expressed (DEGs) between recurrent patients and non-recurrent patients (|fold change| > 1.5, p < 0.05). GeneOntology analysis showed that these DEGs were enriched in immune response, mitotic cell cycle, inflammatory response, cell adhesion as well as extracellular matrix organization, which indicated that these biological processes may exert significant impacts on the therapeutic effects of radiation. In addition, a total of 150 lncRNAs were identified as differentially expressed between recurrent patients and non-recurrent patients (|fold change| > 1.5, p < 0.05). The differentially expressed mRNAs and lncRNAs were confirmed by quantitative real-time PCR. Cox regression model was further applied to explore potential lncRNAs involved in certain signaling pathways such as JAK/STAT, EGRF/ATK/PI3K are highly co-expressed with mRNAs in these signaling pathways. Overall, our results revealed a panel of mRNAs and lncRNAs with significant impacts on evaluating the TNBC radio-therapeutic effects as well predicting the possibility of recurrence.

Citation Format: Xingxing CHEN, Zhaozhi YANG, Yizhou JIANG, Jinli MA, Xiaoli YU, Zhimin SHAO, Xiaomao GUO. Comprehensive transcriptome analysis identifies integrated mRNA-lncRNA signature of triple-negative breast cancer treated with radiotherapy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 3198.