Open Access

Prognostic values of the inhibitor of DNA‑binding family members in breast cancer

  • Authors:
    • Xiao‑Ling Zhou
    • De Zeng
    • Yan‑Hong Ye
    • Shu‑Ming Sun
    • Xiao‑Feng Lu
    • Wei‑Quan Liang
    • Chun‑Fa Chen
    • Hao‑Yu Lin
  • View Affiliations

  • Published online on: July 23, 2018     https://doi.org/10.3892/or.2018.6589
  • Pages: 1897-1906
  • Copyright: © Zhou et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The inhibitor of DNA‑binding (ID) proteins are dominant‑negative modulators of transcription factors with basic helix‑loop‑helix (bHLH) structures, which control a variety of genes in cell cycle regulation. An increasing volume of evidence has demonstrated that the deregulated expression of IDs in several types of malignancy, including breast carcinoma, has been proven to serve crucial regulatory functions in tumorigenesis and the development of breast cancer (BC). The present study evaluated the prognostic values of the ID family members by investigating a set of publicly accessible databases, including Oncomine, bc‑GenExMiner, Kaplan‑Meier plotter and the Human Protein Atlas. The results demonstrated that mRNA levels of distinct IDs exhibited diverse profiles between BC and normal counterparts. The mRNA expression level of ID2 was significantly higher in breast cancer than normal tissues, while the mRNA expression levels of ID1, ID3 and ID4 were significantly lower in breast cancer tissues than in normal tissues. Furthermore, higher mRNA expression levels of ID1 and ID4 were associated with subgroups with lower pathological grades and fewer lymph node metastases. Survival analysis revealed that elevated mRNA levels of ID1 and ID4 predicted an improved survival in all patients with BC. Increased ID1 mRNA levels were associated with higher relapse‑free survival rates in all patients with BC, particularly in those with ER positive and Luminal A subtype tumors. Increased ID4 mRNA expression predicted longer survival times in all patients with BC, particularly in those with hormone receptor‑positive tumors or those treated with endocrine therapy. These results indicated that IDs are essential prognostic indicators in BC. Future studies on the effect of IDs on the pathogenesis and development of BC are warranted.

Introduction

The inhibitor of DNA binding/differentiation (ID) proteins, as a group of helix-loop-helix transcription factors, are individually fundamental to development and cell cycle control (1). Recently, loss- and gain-of-function studies have indicated the oncogenic effects of ID proteins in tumors, and have revealed associations between these proteins and malignant features, including transformative cellular phenotype, abnormal senility, facilitating proliferation and distant spreading (24).

Different human malignancies have been detected for ID expression levels (5). For instance, it has been reported and agreed that increased levels of IDs were associated with malignant grade and a poor prognosis in various types of carcinoma (69). It has been revealed that increasing ID1 mRNA expression was observed in subtypes of human breast tumors and that this acted as a driver in BC metastasis (1012). The extracellular micro-environmental signals can promote a role for ID2 in tumorigenesis (1214). Overexpression of ID2 is associated with adverse outcomes in pancreatic carcinoma, neuroblastoma and pulmonary carcinoma (1517). In addition, increased ID2 protein levels indicated an unfavorable prognosis in patients with basal-like subtypes of BC (18). Cellular localization of ID2 has been recognized as an important factor in determining disease outcome. In BC, cytoplasmic, but not nuclear, localization of ID2 protein was associated with less invasive and expansionary phenotypes (19,20). Kowanetz et al demonstrated that abnormal ID2 or ID3 expression led to proliferation inhibition and epithelial-mesenchymal transition of BC cells, which was induced by transforming growth factor β. Furthermore, knockdown of endogenic ID2 or ID3 enhanced the sensitivity of breast epithelial cells to bone morphogenetic proteins (BMPs), which resulted in growth inhibition and poorer differentiation (21). Wen et al (22) reported the amplified ID4 protein in triple-negative breast carcinoma, while a study undertaken by Thike et al (23) demonstrated that ID4 may be downregulated by BRCA1.

Nonetheless, the specific roles of individual ID family members in BC and the association between IDs and the clinicopathological features of BC have not yet been elucidated. Therefore, in-depth investigation and analysis into the potential roles of ID proteins in BC is required, and may provide an insight into the molecular mechanisms underpinning the disease.

The present study aimed to systemically investigate the prognostic values and potential roles of individual IDs in BC based on a series of large databases. Characterization of the ID expression status of patients with BC may be valuable, not only for diagnostic and prognostic assessment, but also for guiding BC management in the future.

Materials and methods

Oncomine analysis

In order to analyze the expression levels of specific IDs in a variety of malignancies, an access online database Oncomine (www.oncomine.org), which is an online cancer microarray database to facilitate and promote discovery from genome-wide expression analyses, was used. Paired Student's t-test was used, and a fold-change of 2 with a P-value of <0.01 was defined as clinically significant, as previously described (24).

Breast cancer gene-expression miner v4.0 analysis

In order to analyze the association among expression levels of specific IDs and specific clinicopathological features of BC, including hormonal receptors and lymph nodal status, the open access database Breast Cancer Gene-Expression Miner v4.0 (bcGenExMiner v4.0), which is comprised of 36 annotated genomic datasets and three statistical mining functions, was used (http://bcgenex.centregauducheau.fr/BC-GEM/GEM-requete.php) (25,26).

GOBO analysis

The mRNA expression levels of IDs were analyzed by uploading corresponding affymetrix probes to the GOBO database (http://co.bmc.lu.se/gobo/gsa.pl). GOBO is an online accessible tool that allows rapid evaluation of gene expression levels, identification of co-expressed genes and connection with prognosis for single gene, gene sets or gene signatures in a BC dataset.

The human protein atlas

The Human Protein Atlas (HPA) is an open access program that maps all the human proteins in cells, as well as tissue samples (https://www.proteinatlas.org/) (27). The Pathology Atlas of HPA demonstrates the association between specific protein levels and survival of patients with BC (28).

The Kaplan-Meier plotter survival analysis

To analyze the prognostic values of specific IDs in BC samples, the Kaplan-Meier plotter (www.kmplot.com) was used to display the relapse-free survival (RFS). The log-rank P-value was presented on the webpage (29).

Results

mRNA expression patterns of ID family members in human BC

Thus far, four ID family members have been identified in human cancer. The differences in the mRNA expression of the 4 IDs between tumor and normal tissues in multiple types of cancer were analyzed using the online Oncomine database. As demonstrated in Fig. 1, the Oncomine database contained a total of 445, 457, 420 and 442 unique analyses for ID1, ID2, ID3 and ID4, respectively. In BC analysis, there were two studies revealing a statistically significant increase in the mRNA expression level of ID2 in BC tissues, compared with normal tissues. As for ID1, ID3 and ID4, five, four and 17 unique analyses datasets with statistical significance revealed higher expression levels in normal tissues than in cancer tissues. These data indicated that the expression of ID1, ID3 and ID4 was markedly lower in BC samples than in normal breast tissues (Fig. 1).

We also analyzed gene alterations using CbioPORTAL. Based on the analysis of CbioPORTAL, the genetic alteration rate of ID1-ID4 was 2.2, 2.1, 0.5, and 2.8%, respectively. However, there was no significant association between gene alteration and without alteration (data not shown).

Increased ID1 and ID4 expression is associated with the subgroup with no lymph node metastasis and with lower tumor grades

To further identify the mRNA expression of ID family members in different clinicopathological groups of patients, bc-GenExMiner database analysis was used. Increased ID1 mRNA and ID4 mRNA expression was observed in the negative lymph node metastasis BC patients (Fig. 2A, P=0.0005; Fig. 2D, P=0.0004). Nevertheless, no statistically significant difference in ID2 and ID3 mRNA expression was observed between patients with LN (+) and LN (−) BC (Fig. 2B, P=0.9169; Fig. 2C, P=0.4145). Lower Scarff-Bloom-Richardson (SBR) status grade (30), was associated with a higher mRNA expression level of ID1, ID3 and ID4 (Fig. 2E, P<0.0001; Fig. 2G, P<0.0001; Fig. 2H, P<0.0001), but was not associated with the mRNA expression level of ID2 (Fig. 2F, P=0.2041). All the subgroup comparisons are presented in Tables IIII.

Table I.

Lower SBR grade status is associated with the enriched mRNA level of ID1.

Table I.

Lower SBR grade status is associated with the enriched mRNA level of ID1.

Group comparison P-valuea
SBR2<SBR1P<0.0001
SBR3<SBR1P<0.0001
SBR3=SBR2P>0.1000

a Dunnett-Tukey-Kramer's Tests, P (Welch) <0.0001. SBR, Scarff- Bloom-Richardson.

Table III.

Lower SBR grade is associated with the enriched mRNA level of ID4.

Table III.

Lower SBR grade is associated with the enriched mRNA level of ID4.

Groups comparison P-valuea
SBR2<SBR1P<0.0001
SBR3<SBR1P<0.0100
SBR3>SBR2P<0.1000

a Dunnett-Tukey-Kramer's Tests, P (Welch) <0.0001. SBR, Scarff- Bloom-Richardson.

Consistently, in GOBO analysis, the lower tumor grade subgroup of BC patients was associated with increased expression levels ID1, ID3 ID4 (Fig. 3A, P<0.00001; Fig. 3C, P=0.00001; Fig. 3D, P=0.00002), but was not associated with the mRNA expression level of ID2 (Fig. 3B, P=0.21427). These data indicated that increased expression of ID1 and ID4 was associated with the subgroup of BC patients with a low malignant grade and low metastasis potential.

Increased expression of ID1 and ID4 predicts an improved survival in patients with BC

Subsequently, the distant metastasis prognostic effect of ID family members in BC was analyzed. Analysis from bc-GenExMiner demonstrated that increased ID1 or ID4 mRNA was associated with longer distant metastasis-free survival (DMFS) times in all patients with BC (Fig. 4A, HR=0.82, 95% CI: 0.73–0.92, P=0.0011; Fig. 4D, HR=0.86, 95% CI: 0.76–0.98, P=0.0194). However, ID2 and ID3 mRNA expression levels were not significantly associated with DMFS among all BC patients (Fig. 4B, HR=0.95, 95% CI: 0.84–1.07, P=0.4123; Fig. 4C, HR=1.04, 95% CI: 0.92–1.17, P=0.5220). These results confirmed that higher expression of ID1 and ID4 predicted a lower potential of metastasis and improved DMFS in patients with BC.

Consistently, analysis from The Human Protein Atlas revealed that increased ID1 or ID4 protein expression was associated with improved survival in patients with BC (Fig. 4E, P=0.0389; Fig. 4H, P=0.00325). However, there was no significant difference in the protein expression levels of ID2 or ID3 in patients with BC (Fig. 4F, P=0.253; Fig. 4G, P=0.0673).

Among the ID family, the expression of ID1 and ID3 have a significant positive correlation in BC (data not shown).

Increased ID1 mRNA expression is significantly associated with longer RFS times in patients with BC, particularly in the ER-positive subtypes

The present study then evaluated the prognostic values of ID family members for BC using the KM Plotter database. RFS was analyzed for each gene. It was demonstrated that high ID1 mRNA expression predicted longer RFS times in patients with BC (Fig. 5A, HR=0.81, P=0.00023). In particular, sub-analysis revealed that elevated ID1 mRNA expression was associated with longer RFS times in the ER-positive BC subgroup of patients (Fig. 5B, HR=0.78, P=0.00015), but not in the ER-negative BC subgroup of patients (Fig. 5C, HR=0.99, P=0.92).

In addition, increased ID1 mRNA expression was significantly associated with longer RFS times in BC patients with special molecular subtype Luminal A tumors (Fig. 5D, HR=0.71, P=0.00011), but not in other molecular subtypes, including Luminal B (Fig. 5E, HR=0.96, P=0.64), HER-2 type (Fig. 5G, HR=0.86, P=0.43) and Basal-like (Fig. 5F, HR=1.02, P=0.9). These data demonstrated that ID1-overexpression was associated with longer survival times in patients with BC, particularly in the ER-positive and Luminal A subtype subgroups.

Increased ID4 predicts improved survival in patients with BC, particularly in the hormone receptor-positive patients and the subgroup of patients treated with endocrine therapy

RFS analysis of ID4 from the KM Plotter database revealed that high expression of ID4 mRNA was associated with improved RFS in patients with BC (Fig. 6A, HR=0.88, P=1.9e-2). Furthermore, high mRNA expression of ID4 predicted longer survival times in patients with ER-positive (Fig. 6B, HR=0.74, P=5.1e-6) and PR-positive (Fig. 6D, HR=0.52, P=3.1e-4) disease. However, no statistical significance was observed in the groups of ER-negative (Fig. 6C, HR=1.18, P=0.12) or PR-negative (Fig. 6E, HR=1.11, P=0.47) patients. These data revealed that increased expression of ID4 predicted longer survival times in patients with BC, particularly in the hormone receptor-positive subgroup of patients.

Furthermore, subgroup analysis revealed that increased ID4 mRNA expression was significantly associated with improved RFS in BC patients with Luminal A molecular subtype tumors (Fig. 6F, HR=0.77, P=2.8e-3), but not in other molecular subtypes, including Luminal B (Fig. 6G, HR=0.93, P=0.46), Basal-like (Fig. 6H, HR=1.22, P=0.12) and HER-2 type (Fig. 6I, HR=1.09, P=0.67).

Additionally, higher mRNA expression of ID4 was significantly associated with longer RFS times in patients with BC who had received endocrine therapy (Fig. 6J, HR=0.62, P=1e-4), but not in the group that excludes endocrine therapy (Fig. 6K, HR=0.93, P=0.43), indicating a potential role of ID4 in endocrine therapy sensitivity in BC. Notably, the results of the present study also revealed that high mRNA expression of ID4 was associated with longer RFS times in patients with BC who had received tamoxifen for endocrine therapy only (Fig. 6L, HR=0.65, P=3.6e-3), indicating that ID4 may contribute toward tamoxifen therapy sensitivity in BC.

Discussion

Over recent decades, key molecular signatures associated with BC, including ER, PR and HER-2, have been identified and well-characterized (31). Emerging evidence has continued to identify novel targets and signaling pathways, including PARP, CDK4/6 and PI3K/Akt/mTOR, which significantly contribute toward the pathogenesis and development of BC, leading to a paradigm shift in the treatment of BC (32).

ID family members are pivotal modulatory proteins that have been recognized to be downstream targets of a number of oncogenic pathways, making them attractive targets for the treatment of cancer (4,5,33). However, there are significant contradictions in the specific roles of different IDs in BC development (34).

In the present study, analysis of Oncomine, bc-Gen ExMiner, The Human Protein Atlas and Kaplan-Meier plotter, was used to systemically depict the expression profiles of individual IDs in BC, revealing that the IDs exhibited marked differences in mRNA expression between breast tumor and normal tissues. The results indicated that the mRNA expression level of ID2 was significantly higher in BC than in normal tissues, while the mRNA expression levels of ID1, ID3 and ID4 were significantly lower in BC tissues than in normal tissues. Wazir et al (35) reported that increased expression of ID1 in BC was correlated with disease severity and predicted a poor survival outcome. Nonetheless, the present study revealed contradictory results in the analysis of ID1 expression in human BC, which may be primarily attributed toward discrepancies in detection methods for mRNA and protein among different investigators.

IDs are capable of promoting the tumorigenesis of BC by suppressing cell differentiation, activating proliferation and promoting tumor development (12). However, individual IDs may serve diverse roles in this process. Increased ID1 and ID4 expression was associated with the subgroup without lymph node metastasis and a lower tumor grade. The results indicated that ID1 and ID4 may serve suppressive roles in the development of BC.

It has been reported that IDs are important driving forces involving distant metastasis of a variety of cancer types, including BC (36,37). Gumireddy et al (38) demonstrated that ID1 facilitated the spreading of BC via regulation of S100A9 expression. However, following assessment of the distant metastasis prognostic effect of ID family members in BC through analysis of the bc-GenExMiner database, it was revealed that increased ID1 or ID4 mRNA expression was associated with longer DMFS times in all patients with BC.

The results demonstrated that increased ID1 mRNA expression was significantly associated with longer RFS times in patients with BC, particularly in those with ER-positive and Luminal A subtype tumors. Although the majority of studies have demonstrated that high ID1 expression was generally an adverse prognostic indicator (35), the results have not been entirely consistent. Cheng et al (39) reported a paradoxical result that increased ID1 expression predicts a favorable survival outcome in patients with lung cancer that has been surgically treated, followed by adjuvant paclitaxel plus cisplatin chemotherapy, and this distinct role of ID1 possibly stems from the ID1-dependence of NSCLC cells for survival, thereby rendering the cancer cells to be more sensitive to a specific chemotherapy regimen. The present study also demonstrated that increased ID4 expression was a favorable prognostic factor in patients with BC. Furthermore, it was revealed that increased ID4 expression predicted improved survival in the subset of patients with hormone receptor-positive tumors, as well as the subgroup of patients treated with endocrine therapy. These results were consistent with those of a study undertaken by Zhang et al (40), which reported that hypomethylation of ID4 may act as a critical biomarker for identifying acquired tamoxifen resistance in BC.

Another study undertaken by Patel et al (41) suggested that ID4 may serve a suppressive role in prostate cancer, and that its loss facilitates CRPC through constitutive activation of the androgen receptor. The possible mechanism of this is that ID4 acts as a suppressor of ID-1, −2 and −3, and stimulates transcription (42). Therefore, we hypothesized that ID4 may serve an essential role in the sensitivity of endocrine therapy.

In summary, the IDs exhibited diverse expression profiles between BC tissues and normal breast tissues. Notably, the results indicated that increased ID1 and ID4 expression was associated with low pathological grades of BC and predicted an improved survival outcome in patients with distinct subtypes of BC. Future in-depth studies are warranted to elucidate the exact functions of ID1 and ID4 in oncogenesis and the progression of BC, which may provide further evidence that ID1 and ID4 could be critical prognostic indicators and promising therapeutic targets in BC. However, the in silico analyses are limited; for example, the data is limited to one dataset (Affymetrix arrays-based) and RNA-Seq data (TCGA) or other array platforms (Illumina in the METABRIC) are not taken into consideration. Nonetheless, the results of the present study indicated that IDs were potential prognostic indicators in BC and further study on the values of IDs in the pathogenesis and development of BC is warranted.

Acknowledgements

We are grateful to Dr Pi Guo for critically reading the manuscript. We also thank Dr Yin-Sheng Xiao for advice or technical assistance in the TCGA data analysis.

Funding

The present study was partly supported by The Natural Science Foundation of Guangdong Province, China (no. 2015A030313429), The Youth Innovative Talent Project of Colleges and Universities in Guangdong Province, China (nos. 2016KQNCX051 and 2017KQNCX073).

Availability of data and materials

The datasets used during the present study are available from the corresponding author upon reasonable request.

Authors' contributions

HYL designed the study. YHY, SMS and WQL prepared the figures and tables. XFL and CFC analyzed and interpreted the data. XLZ and DZ drafted the manuscript. All authors read and approved the manuscript and agree to be accountable for all aspects of the research in ensuring that the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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October-2018
Volume 40 Issue 4

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Copy and paste a formatted citation
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Spandidos Publications style
Zhou XL, Zeng D, Ye YH, Sun SM, Lu XF, Liang WQ, Chen CF and Lin HY: Prognostic values of the inhibitor of DNA‑binding family members in breast cancer. Oncol Rep 40: 1897-1906, 2018
APA
Zhou, X., Zeng, D., Ye, Y., Sun, S., Lu, X., Liang, W. ... Lin, H. (2018). Prognostic values of the inhibitor of DNA‑binding family members in breast cancer. Oncology Reports, 40, 1897-1906. https://doi.org/10.3892/or.2018.6589
MLA
Zhou, X., Zeng, D., Ye, Y., Sun, S., Lu, X., Liang, W., Chen, C., Lin, H."Prognostic values of the inhibitor of DNA‑binding family members in breast cancer". Oncology Reports 40.4 (2018): 1897-1906.
Chicago
Zhou, X., Zeng, D., Ye, Y., Sun, S., Lu, X., Liang, W., Chen, C., Lin, H."Prognostic values of the inhibitor of DNA‑binding family members in breast cancer". Oncology Reports 40, no. 4 (2018): 1897-1906. https://doi.org/10.3892/or.2018.6589