- Open Access
A 41-gene signature derived from breast cancer stem cells as a predictor of survival
- Zhi-Qiang Yin†1,
- Jian-Jun Liu†1,
- Ying-Chun Xu1,
- Jian Yu2,
- Guo-Hui Ding2,
- Feng Yang1,
- Lei Tang1,
- Bao-Hong Liu2,
- Yue Ma1,
- Yu-Wei Xia1,
- Xiao-Lin Lin1 and
- Hong-Xia Wang1, 3Email author
© Yin et al.; licensee BioMed Central Ltd. 2014
- Received: 7 January 2014
- Accepted: 15 April 2014
- Published: 6 June 2014
The aim of this study was to evaluate the ability of a 41-gene signature derived from breast cancer stem cells (BCSCs) to estimate the risk of metastasis and survival in breast cancer patients.
The centroid expression of the 41-gene signature derived from BCSCs was applied as the threshold to classify patients into two separate groups—patients with high expression (high-EL) of the prognostic signature and patients with low expression (low-EL). The predictive ability of the 41-gene signature was evaluated by Cox regression model and was compared against other popular tests, such as Oncotype and MammaPrint.
Our results showed that the 41-gene prognostic signature was significantly associated with age (P = .0351) and ER status (P = .0095). The analysis indicated that patients in the high-EL group had a worse prognosis than those in the low-EL group in terms of both overall survival (OS: HR, 2.05, P = .009) and distant metastasis-free survival (DMFS: HR, 2.24, P = .002). Additionally, the 41-gene signature was an independent risk factor and separates patients based on estrogen receptor status. While comparable to Oncotype, the analysis demonstrated that the 41-gene signature had a better prognostic value in predicting DMFS and OS than AOL, NPI, St. Gallen, Veridex, and MammaPrint.
This study confirms the utility of the 41-gene signature and adds to the growing evidence that gene expression signatures of BCSCs have clinical potential to predict patient outcome and aid in treatment choice.
- Prognostic signature
- Breast cancer
- Stem cell
Personalized medicine, the selection of therapy based on a patient’s individual characteristics, may result in better outcomes than the use of generalized medicine [1–4]. Prognostic factors commonly applied in breast cancer include age, tumor size, lymph node involvement, pathological grade, and status of HER-2, Ki-67, and several hormone receptors, including both estrogen receptor (ER) and progesterone receptor (PR) [5, 6]. Although several guidelines have been developed to assist clinicians in selecting patients who are at high risk of recurrence, it still remains a challenge to distinguish patients who have poor prognosis and require demanding adjuvant systemic therapy from those who could be spared such treatment. Due to the complexity of the disease, several other factors have been investigated for their potential to predict breast cancer outcome. However, most have only limited predictive power [7, 8].
Recent findings support the concept that a rare population of cells, termed cancer stem-like cells (CSCs), is the cellular origin of cancer [9, 10]. Such findings imply that it is these CSCs that are responsible for tumor initiation, progression, and response to therapy [11, 12]. Therefore, an advance in our knowledge of the properties of CSCs has become a topic of considerable interest.
We previously identified a rare population of breast cancer stem cells (BCSCs) from tissue [13, 14]. Human cancer is characterized by high heterogeneity in gene expression and phenotype, both of which influence tumor growth rate and drug sensitivity. We performed expression profiling to identify signaling pathways enriched in BCSCs. According to the gene expression profile, we found that sixty-three probe sets corresponding to forty-one genes showed greater than a four-fold difference in BCSCs compared to non-BCSCs. We hypothesized that this BCSC signature might be useful as a classification system since it outperformed most other clinical variables in predicting the likelihood of distant metastases and overall survival (OS) in breast cancer patients.
A more accurate means of prognostication in breast cancer will improve the selection of patients for adjuvant systemic therapy and will improve clinical decisions and strategies used to treat patients with this disease. Therefore, the present study was conducted to further evaluate the forty-one gene signature as a tool to accurately estimate the risks of metastases and survival in breast cancer patients.
Database of patients
Normalized gene expression data, together with the patient’s characteristics, were retrieved from the public GEO database (http://www.ncbi.nlm.nih.gov/geo; accession number GSE7390). For each patient, the information generated from the dataset included surgery type, angioinvasion (lymph vascular invasion), histopathological grading, ER status, OS, distant metastasis-free survival (DMFS), clinical risk group according to St. Gallen criteria, National Provider Identifier (NPI) criteria, Adjuvant online (AOL) (http://www.adjuvantonline.com), Veridex signature, MammaPrint, and Oncotype Dx.
The 41 DEGs (differential expressed genes) correspond to 63 probe sets. Based on these probe sets, we obtained relevant expression values of patients from GSE7390. The centroid expression of these probe sets was applied as the patient classification threshold. Based on the threshold of the prognostic signatures, breast cancer patients in the dataset can be classified into two separate groups—patients with high expression (high-EL) of the prognostic signature and patients with low expression (low-EL) of the prognostic signature.
To assess the prognostic value of the 41-gene signature, we utilized the Kaplan-Meier estimator to plot survival curves and the log-rank test to compare differences between two groups . Fisher's exact test was employed to investigate the relevance between the 41-gene signature and clinical factors. Standard Cox proportional hazards regression were implemented to predict OS and DMFS. The performance of the 41-gene signature and other standard criteria, including AOL, NPI, St. Gallen, Veridex, Oncotype DX, and MammaPrint were evaluated in terms of LHR and Akaike information criterion (AIC) in a full model (all systems included) and in a series of reduced models where each interested factor was removed once each time. When removed from the full model, the best option results in the largest drop in LHR χ2 and an increase in AIC. All statistical analyses were performed by the R programming package with rms.
End points considered in this study were time from diagnosis to distant metastases (DMFS) and OS, which was defined as time from diagnosis to death by any cause. The linearity of the relation between the relative hazard ratio and the diameter of the tumor, age, and ER expression level were tested using the Wald test for nonlinear components of restricted cubic splines. No evidence for nonlinearity was found (P = .83 for age, P = .75 for tumor diameter, P = .65 for the number of positive nodes, and P = .27 for ER expression). We evaluated whether the hazard ratio was proportional using the method of Grambsch and Therneau.
Characteristics of patients
The study was carried out with frozen archived tumor material from early stage breast cancer patients using the Affymetrix HG-U133A chip as previously described by the TRANSBIG consortium .
Pattern of the 41-gene expression profile in breast cancer patients
List and functional annotation of the 41 genes in the study
DEAD box protein.
Corneocdesmosin, is a secreted protein found in corneodesmosomes.
Sphingomyelin synthase 1.
Similar to Aurora kinase A-interacting protein (AURKA-interacting protein).
A sterile alpha motif domain-containing protein, regulating cell proliferation/apoptosis.
Chemokine (C-C motif) ligand 5.
Family with sequence similarity 110, member B.
DNA replication licensing factor, Minichromosome maintenance complex component 7.
Encodes a member of the 2-5A synthetase family, essential proteins involved in the innate immune response to viral infection.
A member of the 2-5A synthetase family.
A small (~21 kDa) signaling G protein, and is a member of the Rho family of GTPases.
Laminin, alpha 3.
Receptor (G protein-coupled) activity modifying protein 3.
A protein with similarity to a rat protein that has an inhibitory effect on protein phosphatase-1.
Sodium channel, voltage-gated, type I, beta.
An estrogen-responsive gene.
Coronin, actin binding protein, 1A.
Interferon-induced protein with tetratricopeptide repeats 1.
Interferon-induced protein with tetratricopeptide repeats 2.
Interferon-induced protein with tetratricopeptide repeats 3.
Carcinoembryonic antigen-related cell adhesion molecule 1 (biliary glycoprotein).
Carcinoembryonic antigen-related cell adhesion molecule 6.
wntless homolog (Drosophila).
Interferon, beta 1, fibroblast.
Mediator complex subunit 27, the activation of gene transcription.
2′-5′-oligoadenylate synthetase-like gene.
A member of the Kruppel-like family of transcription factors.
A zinc finger protein containing a KRAB (Kruppel-associated box) domain.
A member of the keratin gene family.
A member of the bone morphogenetic protein family.
Melanoma-associated antigen D2.
A chemokine of the CXC subfamily and ligand for the receptor CXCR3.
Interferon induced with helicase C domain 2.
A beta isoform of tubulin, which binds GTP and is a major component of microtubules.
Complement factor B.
A disintegrin and metalloproteinase with thrombospondin motifs protein family.
ST3 beta-galactoside alpha-2,3-sialyltransferase 1.
StAR-related lipid transfer (START) domain containing 13.
Interferon induced with helicase C domain 1.
Association between the 41-gene prognostic signature and clinical variables
The 198 patients were divided into two groups based on high expression level (high-EL, n = 99) and low expression level (low-EL, n = 99), similar to earlier reports . These levels correspond to a poor prognostic signature and a good prognostic signature, respectively. To gain insight into the relationship between the 41-gene prognostic signature and clinical variables, we performed correlation analysis with histopathologic data of patients, such as, age, surgery type, grade, and ER expression as determined by immunohistochemical (IHC) staining. The results showed that the 41-gene prognostic signature was significantly associated with age (P = .0351) and ER status (P = .0095). Patients in the high-EL group were younger in age and had ER-negative tumors. There was also a slightly significant association with tumor grade. However, the p value showed no statistical significance.
Analysis of DMFS and OS based on the prognostic signature
Our analysis indicated that the likelihood of patients developing distant metastasis at 5 years and 10 years was higher in the low-EL group than in the high-EL group (5 year DMFS: 88% versus 75%, respectively; 10 years DMFS: 83% versus 64%, respectively). Prolonged OS was also observed in low-EL patients.
Additionally, multivariate analysis was conducted to adjust for confounding variables including age, tumor size, tumor grade, and ER status. Results confirmed that the 41-gene signature was an independent prognostic factor for these breast cancer patients (OS: HR, 1.96, P = .02; DMFS: HR, 2.09, P = .008).
Survival comparison between the new markers and other standard criteria
To obtain a more powerful estimate of the signature in predicting clinical outcome, we compared the 41-gene prognostic signature with other commonly used criteria, such as AOL, NPI, St. Gallen, and Veridex. Based on this analysis, patients in the database can be divided into a high-risk group and a low-risk group according to various histologic and clinical characteristics. We calculated DMFS and OS according to these different prognostic profiles. The analysis indicated that the 41-gene signature had the best prognostic value in predicting DMFS (P = .058 for AOL; P = 0.017 for NPI; P = .11 for Veridex; and P = .212 for St. Gallen) (Figure 2B, 2C, 2D, 2E) and OS (P = .074 for AOL; P = .031 for NPI; P = .053 for Veridex; and P = .312 for St. Gallen) for early breast cancer patients (Figure 3B, 3C, 3D, 3E).
Prognostic value in high-risk patients defined by other standard criteria
Comparison of the prognostic value of the 41-gene signature with Oncotype Dx and MammaPrint
To assess the concordance of the 41-gene signature with published prognostic gene signatures, we implemented the original algorithms of the Oncotype Dx (Genomic Health) and MammaPrint (Agendia) gene signatures and applied them to the 41-gene signature in our compendium of microarray datasets.
Comparison of the prognostic value of 41-gene signature with other risk assessment criteria
We further investigated the prognostic ability of the 41-gene signature under different definitions of “high risk” using forest plots. As shown in Figure 5A and Figure 5D, the new markers displayed good predictive ability in almost all subgroups except for ER-positive patients.
Subgroup analysis according to ER status
Previous studies linking gene expression profiles to clinical outcome in breast cancer have demonstrated that the potential for distant metastasis and OS probability may be attributable to biological characteristics of the primary tumor [18–21]. In their seminal work, Paik et al.  reported that a 21-gene recurrence score (RS) assay quantifies the likelihood of distant recurrence in women with ER-positive, lymph node-negative breast cancer treated with adjuvant tamoxifen; it also predicts the magnitude of chemotherapy benefit. Perou et al.  identified tumors with distinct patterns of gene expression termed “basal type” and “luminal type”, using complementary DNA (cDNA) microarray to analyze breast cancer tissues. These subgroups differ with respect to disease outcome in patients with locally advanced breast cancer. Generally, it is agreed that patients with poor prognostic features benefit most from adjuvant therapy.
We previously identified a gene expression profile of 41-gene markers that is associated with BCSCs. Since BCSCs are considered to be the root of metastasis, promote recurrence of the malignancy, and are resistant to traditional therapy [24–27], we tested this profile in a series of 198 consecutive patients who were diagnosed with early breast cancer. The results showed that the 41-gene profile performed best as a predictor of DMFS by classifying patients into high-EL and low-EL groups. The prognostic signature is also a strong predictor of OS in patients with lymph node negative disease in this cohort.
To our knowledge, this is the first attempt at using cancer stem cell related markers as a prognostic signature predicting the survival and recurrence of breast cancer patients. This finding is important since the presence of cancer stem cells is a strong predictor of poor survival and resistance to traditional therapy. This finding also sheds new light on the common biological processes relevant for predicting outcome in breast cancer.
Comparing Figure 2A and Figure 3A, we see a strong correlation between the good-prognostic signature and DMFS (P = .002). Similar results were observed in the analysis of OS (P = .0086). To obtain a more useful estimate of clinical outcome, we calculated the probability of patients who remained free of distant metastasis and OS according to the prognosis profile. For this analysis, our results indicated that the prognostic signature was highly predictive of the risk of distant metastasis. Prolonged OS was also observed in patients with low expression of the 41-gene signature compared to patients in the high-EL group. These results highlight the value of prognostic profiles and the robustness of the profiling technique.
For the purpose of comparison, we also analyzed well-established criteria currently used in the clinic predicting clinical outcomes for breast cancer patients, such as AOL, NPI, St. Gallen, and Veridex. Figure 2 and Figure 3 shows the Kaplan-Meier estimates of the probability that patients would remain free of distant metastasis and OS among the 198 patients with lymph-node-negative breast cancer. In these analysis, patients were classified either by the 41-gene-expression profile or by another commonly used criteria, such as AOL, NPI consensus criteria, St. Gallen criteria, or Veridex criteria. The results indicated that only the NPI consensus criteria (P = .0172) predicted a statistically significant survival outcome in this cohort. It is worth noting that no statistical significance was observed for AOL, NPI, or St. Gallen criteria in predicting clinical outcome for this cohort of breast cancer patients.
MammaPrint  and Oncotype Dx  are currently commercially available diagnostic tests that quantify the likelihood of disease recurrence in women with early-stage breast cancer. Within this cohort, the analysis revealed that the 41-gene signature and Oncotype Dx both had strong prognostic value in predicting DMFS and OS in this 198 patient group. However, there was no statistically significant difference observed for the analysis with MammaPrint.
High-risk patients identified by AOL, NPI, St. Gallen, or Veridex criteria tended to have a lower likelihood of DMFS and OS than those classified according to the 41-gene expression profiling. This result indicates that both sets of the currently used criteria “misclassified” a clinically significant number of patients. Indeed, the high-risk group, defined according to these criteria, might include a number of patients who actually had a good-prognostic signature with a possible good outcome. Since both these subgroups contain some “misclassified” patients (who can be better identified through the prognosis signature), these patients might be mistreated in current clinical practice.
Based on our analysis, we predict that the 41-gene signature profile significantly associates with clinical outcome in the entire patient cohort. Thus, we further evaluated the prognostic utility of these 41-genes in ER positive and ER negative patients, respectively. In the subgroup analysis, there was a significant association between the 41-gene signature and both OS and DMFS in ER-negative breast cancer patients. In contrast, the signature did not show strong predictive ability for ER positive patients.
The molecular mechanisms regulating BCSCs are distinct from the mechanisms governing differentiated tumor cells. Our data indicate that classification of patients into high-risk and low-risk subgroups on the basis of the 41-gene prognostic profile could prove to be a very useful means of guiding adjuvant therapy in patients with lymph-node-negative breast cancer. This approach should also improve the selection of patients who would benefit from adjuvant systemic treatment, reducing the rate of both over-treatment and under-treatment. Even though these results are encouraging, a larger scale prospective study is required to confirm these results.
The 41-gene prognostic profile demonstrates prognostic significance with strong capability of predicting DMFS and OS in node-negative breast cancer patients. This 41-gene signature of BCSCs was even more strongly associated with clinical outcomes compared with other existing criteria, such as AOL, NPI, Veridex, St. Gallen, and MammaPrint.
This study was supported by the National Natural Science Funds (Project Number: 81102015), the National Program on Key Basic Research Project (973 Program) (Project Number: 2013CB967201), Shanghai Health Bureau Key Disciplines and Specialties Foundation and the Special Funds for Technological Innovation of Shanghai Jiaotong University (Project Number: YG2012MS46).
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