Chapter ONE

1.1 Introduction
1.2 Background of Study
1.3 Problem Statement
1.4 Objective of Study
1.5 Limitation of Study
1.6 Scope of Study
1.7 Significance of Study
1.8 Structure of the Research
1.9 Definition of Terms

Chapter TWO

2.1 Overview of Estrogen Receptor β
2.2 Role of Estrogen Receptor β in Breast Cancer
2.3 Genetic Factors and Estrogen Receptor β Expression
2.4 Treatment Targeting Estrogen Receptor β
2.5 Clinical Studies on Estrogen Receptor β in Breast Cancer
2.6 Hormonal Regulation and Estrogen Receptor β
2.7 Estrogen Receptor β as a Prognostic Indicator
2.8 Estrogen Receptor β and Breast Cancer Recurrence
2.9 Estrogen Receptor β as a Therapeutic Target
2.10 Future Research Directions on Estrogen Receptor β

Chapter THREE

3.1 Research Methodology Overview
3.2 Research Design and Approach
3.3 Data Collection Methods
3.4 Sampling Techniques
3.5 Data Analysis Procedures
3.6 Ethical Considerations
3.7 Research Limitations
3.8 Validity and Reliability of Research

Chapter FOUR

4.1 Analysis of Research Findings
4.2 Estrogen Receptor β Expression Patterns
4.3 Impact of Estrogen Receptor β on Breast Cancer Progression
4.4 Comparison of ERβ Expression in Different Breast Cancer Subtypes
4.5 Therapeutic Implications of ERβ Targeting
4.6 Factors Influencing ERβ Expression Levels
4.7 Future Research Directions
4.8 Recommendations for Clinical Practice

Chapter FIVE

5.1 Summary of Research Findings
5.2 Conclusion
5.3 Implications of Research
5.4 Contributions to Knowledge
5.5 Recommendations for Future Research