Cohort profile: Guangzhou breast cancer study (GBCS)

Area of Science:

• Oncology
• Epidemiology
• Genetics

Background:

• South China exhibits a high incidence of breast cancer (BC), necessitating localized research for effective prevention.
• The Guangzhou Breast Cancer Study (GBCS) was established to address this need through a comprehensive, patient-based prospective cohort design.

Purpose of the Study:

• To identify key risk factors and underlying mechanisms influencing breast cancer incidence and prognosis.
• To facilitate the development of individualized prevention strategies tailored to the South China population.

Main Methods:

• The GBCS integrates three studies: a cohort of 5471 BC patients, a case-control study (1551 cases, 1605 controls), and an immunohistochemistry (IHC) cohort (1063 BC patients).
• Recruitment began in 2008, with participants primarily aged 41-60 years. Follow-up protocols involve frequent monitoring, achieving high retention rates (e.g., 98.6% for the IHC cohort by 2023).
• Data collection encompasses demographics, risk factors, survival, treatment, lifestyle, and extensive laboratory measures including genetic markers, proteins, and environmental exposures.

Main Results:

• The study has maintained high follow-up rates, ensuring robust data integrity until 2023.
• Extensive baseline and follow-up data on risk factors, clinical outcomes, and biological markers have been collected.
• The GBCS provides a valuable resource for understanding breast cancer in the specific context of South China.

Conclusions:

• The GBCS is a significant resource for breast cancer research in South China.
• The study's comprehensive data collection supports the identification of novel risk factors and prognostic indicators.
• Findings from the GBCS can inform targeted, individualized prevention and treatment strategies for breast cancer.