Chromosomal Instability and Clonal Heterogeneity in Breast Cancer: From Mechanisms to Clinical Applications

Area of Science:

• Oncology
• Genetics
• Cancer Biology

Background:

• Chromosomal instability (CIN) and clonal heterogeneity (CH) are core features of breast cancer.
• These phenomena significantly influence tumor evolution, disease advancement, and resistance to therapies.
• Elucidating the mechanisms behind CIN and CH is crucial for enhancing breast cancer management.

Purpose of the Study:

• To provide a comprehensive review of biological processes contributing to CIN and CH in breast cancer.
• To highlight the molecular drivers and clinical significance of CIN and CH.
• To integrate recent findings on the impact and translational implications of CIN and CH for precision medicine.

Main Methods:

• Literature review synthesizing current knowledge on CIN and CH in breast cancer.
• Discussion of advanced detection methods, including single-cell sequencing.
• Exploration of the influence of CIN and CH on treatment responses and the tumor immune microenvironment.

Main Results:

• Advances in high-resolution techniques, such as single-cell sequencing, improve the characterization of intratumoral heterogeneity.
• CIN and CH impact treatment efficacy and can be modulated within the tumor immune microenvironment.
• These hallmarks have significant implications for the effectiveness of immunotherapies.

Conclusions:

• CIN and CH are critical factors in breast cancer progression and therapeutic resistance.
• Understanding these processes offers translational opportunities for precision medicine approaches.
• Targeting CIN and CH may represent novel therapeutic strategies for breast cancer.