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Low expression of ULK1 is associated with operable breast cancer progression and is an adverse prognostic marker of survival for patients

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An Erratum to this article was published on 09 March 2016

Abstract

ULK1 plays an important role in autophagy which is widely involved in the development of breast cancer. However, the function and expression of ULK1 in human breast cancer is still scarcely explored. In this study, we showed that the mRNA and protein levels of ULK1 decreased in 10 of 14 (71.4 %) breast cancer tissues, compared with matched normal tissues. Furthermore, immunohistochemical staining of ULK1 was performed on the tissue microarray containing 298 non-metastatic invasive breast primary cancer tissues and 73 matched adjacent noncancerous tissues. 70.1 % breast cancer specimens displayed none to weak staining of ULK1, however, 78.1 % adjacent noncancerous specimens showed moderate to strong staining of ULK1. Statistical analysis revealed that ULK1 expression was negatively correlated with tumor size (r = −0.176, P = 0.002), lymph node status (r = −0.115, P = 0.048), and pathological stage (r = −0.177, P = 0.002). The log-rank test showed that patients with lower level of ULK1 had a significant shorter distant metastasis-free survival time (P = 0.008) and cancer-related survival time (P = 0.008). Multivariate Cox regression analysis found that ULK1 expression was recognized as an independent prognostic factor (P = 0.034). In addition, a significant positive correlation between expression of ULK1 and LC3A (r = 0.401, P < 0.001), and a significant negative correlation between expression of ULK1 and p62 (r = −0.226, P < 0.001) were observed in our breast cancer cohort. These findings suggest that decreased expression of ULK1 is associated with breast cancer progression, together with closely related to decreased autophagic capacity. ULK1 also may be used as a novel prognostic biomarker for breast cancer patients.

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Acknowledgments

This study is supported by grants from Major science and technology project of the National Basic Research Program (973 Program) of China (2011CB504300), Natural Science Foundation of Guangdong in China (10451008901004533), Nature Science Foundation of China (81001446), Foundation of the Ministry of Science and Technology of Guangdong Province (2011B080701052), Foundation for Distinguished Young Scholars of Sun Yat-Sen University [Grant10ykpy39].

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China

    Jun Tang, Rong Deng, Rong-Zhen Luo, Guo-Ping Shen, Mu-Yan Cai, Zi-Ming Du, Shan Jiang, Ming-Tian Yang, Jian-Hua Fu & Xiao-Feng Zhu

  2. Department of Breast Oncology, Cancer Center, Sun Yat-sen University, Guangzhou, China

    Jun Tang & Ming-Tian Yang

  3. Department of Pathology, Cancer Center, Sun Yat-sen University, Guangzhou, China

    Rong-Zhen Luo, Mu-Yan Cai & Zi-Ming Du

  4. Department of Thoracic Surgery, Cancer Center, Sun Yat-sen University, Guangzhou, China

    Jian-Hua Fu

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Correspondence to Jian-Hua Fu or Xiao-Feng Zhu.

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Jun Tang, Rong Deng, and Rong-Zhen Luo equally contributed to this article.

An erratum to this article is available at http://dx.doi.org/10.1007/s10549-016-3703-5.

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Tang, J., Deng, R., Luo, RZ. et al. Low expression of ULK1 is associated with operable breast cancer progression and is an adverse prognostic marker of survival for patients. Breast Cancer Res Treat 134, 549–560 (2012). https://doi.org/10.1007/s10549-012-2080-y

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