The impact of soy foods on potential breast cancer risk has been a topic of considerable investigation in the medical field. The primary importance of research on soy foods is derived from the fact that these foods are rich in isoflavones, which are supposedly associated with inhibition of breast cancer development (Messina & Wood, 2008, p.1). Isoflavones are mainly contained in soybeans. High soy food intake in Asian countries like Japan is said to have sparked research on the role of isoflavones on reduction of breast cancer in 1990s (Messina & Wu, 2009, p.1673). Some isoflavones such as genistein possess non-hormonal properties that are associated with breast cancer inhibition in women. Thus, it is highly prudent to say that there are several mechanisms by which soy may reduce the risk of breast cancer in women. However, recent epidemiological studies have provided evidence suggesting that isoflavones indeed promote breast cancer (Kang et al, 2010, p.1859). This is because isoflavones such as geinstein have been found to stimulate growth of breast cancer cells which are estrogen-sensitive in overectomized mice. Several in vitro studies have shown that isoflavones can both inhibit or enhance ability of drugs to fight breast cancer (Nagata, 2010, p.83). Thus, understanding of the effects of isoflavones on breast cancer is still vague. This paper explores whether consumption of soy foods and isoflavones cause or inhibit breast cancer in women. In section 1, definitions of Isoflavones, biological functions and endocrine therapies will be given. In section 2, supporting literature on the positive and negative effects of isoflavones will be discussed. In section 3, several studies will be used as examples to support the information provided in section 2.
Table of Contents
1. Introduction
2. Hypothesis
3. Research question
4. Justification
5. Section 1: Definition of isoflavones, biological effects and relative risk
6. Section 2: Supporting literature on effects of Soy food on breast cancer
7. Section 3: Analysis and findings based on various studies
8. Conclusion
Research Objectives and Key Topics
The primary objective of this research is to evaluate whether the consumption of soy foods and isoflavones serves as a preventative measure or a potential risk factor for breast cancer in women. The study aims to provide clarity on the conflicting medical evidence regarding isoflavone intake and its impact on breast cancer development and recurrence.
- Biological mechanisms of isoflavones and phytoestrogens
- Epidemiological evidence regarding soy food intake and cancer risk
- The role of pharmacologic concentrations of isoflavones in cancer treatment
- Clinical findings on breast cancer recurrence and tumor growth
- Comparative analysis of dietary versus supplemental soy intake
Excerpt from the Book
Section 3: Analysis and findings based on various studies
Many epidemiological studies have shown that breast cancer can be reduced by high intake of soy foods. A prospective study involving respondents from Singapore showed that high intake of soy foods can reduce breast cancer among postmenopausal women by approximately 18% (Wu et al, 2008, p.196). In this prospective study conducted on Singapore Chinese women, 35,303 individuals were used as study subjects. The subjects were administered with questionnaires covering 165 food and beverages (Wu et al, 2008, p.196).
Using the Cox Regression model, this prospective study generated a relative risk (RR) of 0.82 at 95% confidence interval (Wu et al, 2008, p.197). Women who had consumed more than median levels of soy foods (>10.6 mg 1000Kcal-1) experienced 18% reduction of breast cancer risk (P-value= 0.019). However, soy intake was found to be statistically insignificant among premenopausal women, with P-value of 0.08 at 5% percent (Wu et al, 2008, p.197). This study therefore shows that soy food intake reduces the risks of breast cancer among women.
Summary of Chapters
Introduction: This chapter outlines the medical controversy regarding soy consumption and breast cancer, while introducing the hypothesis and research question.
Hypothesis: This section posits that high consumption of isoflavones reduces the risk of breast cancer.
Research question: Defines the core inquiry regarding the importance of understanding the benefits and risks of a soy-inclusive diet for women.
Justification: Explains the necessity of evaluating available evidence due to patient confusion and the importance of alternative therapies.
Section 1: Definition of isoflavones, biological effects and relative risk: Provides definitions of isoflavones, their chemical properties as phytoestrogens, and their potential biological impact on cells.
Section 2: Supporting literature on effects of Soy food on breast cancer: Reviews literature on how genistein and daidzein interact with cellular processes and tumor development.
Section 3: Analysis and findings based on various studies: Presents data from epidemiological and clinical studies to analyze the relationship between soy intake and cancer risk or recurrence.
Conclusion: Summarizes that the benefits of isoflavone consumption outweigh the risks, confirming the research hypothesis.
Keywords
Isoflavones, Breast Cancer, Soy Foods, Genistein, Daidzein, Phytoestrogens, Estrogen Receptors, Cancer Recurrence, Epidemiological Studies, Tamoxifen, Anastrozole, Tumor Growth, Pharmacologic Concentrations, Dietary Intake, Medical Oncology
Frequently Asked Questions
What is the primary focus of this research paper?
The paper examines whether the consumption of soy foods and specific isoflavones acts as a deterrent or a contributor to the development of breast cancer in women.
What are the central themes discussed in the study?
The study centers on the biological effects of isoflavones, their role as phytoestrogens, and the conflicting clinical evidence regarding their impact on hormone-sensitive breast cancer.
What is the primary research goal?
The goal is to determine if it is important for women to understand the specific health benefits and potential risks associated with including soy in their diet.
Which scientific methodologies are utilized?
The paper utilizes a review of existing epidemiological studies, meta-analyses, and clinical data, including the use of Cox Regression models and observations of tumor growth in animal models.
What topics are covered in the main body?
The main body covers chemical definitions of isoflavones, supporting and contradictory literature, and an analysis of specific cohort and clinical studies regarding cancer incidence and recurrence.
How would you characterize this work through keywords?
Key terms include breast cancer, isoflavones, soy foods, phytoestrogens, and cancer recurrence, reflecting the balance between dietary health and medical intervention.
How do isoflavones affect breast cancer recurrence?
The research indicates that for some women, particularly in the highest consumption quartiles, isoflavone intake is associated with lower recurrence rates when combined with adjuvant endocrine therapy.
Why are there conflicting findings regarding soy and cancer?
Conflicts arise because isoflavones can act as estrogen mimics; while they can suppress tumor growth under certain conditions, they may also stimulate the growth of estrogen-sensitive cancer cells in specific experimental environments.
What conclusion does the author reach regarding the hypothesis?
The author concludes that the hypothesis is true, suggesting that the anti-cancer benefits of isoflavones generally outweigh the risks, thus supporting the inclusion of soy in the female diet.
- Arbeit zitieren
- Carol Nganga (Autor:in), 2011, Soy Foods and Isoflavones: Cause or Inhibit Breast Cancer?, München, GRIN Verlag, https://www.grin.com/document/280533
