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 and Breast Cancer
2.2 Historical Perspectives on Estrogen Receptor β Research
2.3 Molecular Mechanisms of Estrogen Receptor β in Breast Cancer
2.4 Role of Estrogen Receptor β in Breast Cancer Development
2.5 Clinical Implications of Estrogen Receptor β in Breast Cancer
2.6 Therapeutic Targeting of Estrogen Receptor β in Breast Cancer
2.7 Current Research Trends in Estrogen Receptor β and Breast Cancer
2.8 Knowledge Gaps and Future Directions in Estrogen Receptor β Research
2.9 Comparative Studies on Estrogen Receptor β and Other Biomarkers in Breast Cancer
2.10 Ethical Considerations in Estrogen Receptor β Research

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 in Research
3.7 Validity and Reliability Measures
3.8 Limitations of the Research Methodology

Chapter FOUR

4.1 Analysis of Research Findings
4.2 Estrogen Receptor β Expression Levels in Breast Cancer Samples
4.3 Correlation Between Estrogen Receptor β and Clinical Outcomes
4.4 Impact of Estrogen Receptor β Targeted Therapies
4.5 Comparison with Estrogen Receptor α in Breast Cancer
4.6 Molecular Signaling Pathways Involving Estrogen Receptor β
4.7 Evaluation of Treatment Response Based on Estrogen Receptor β Status
4.8 Discussion on Future Research Directions

Chapter FIVE

5.1 Conclusion and Summary
5.2 Recap of Key Findings
5.3 Implications for Clinical Practice
5.4 Contributions to the Field of Breast Cancer Research
5.5 Suggestions for Further Studies