Global estimates indicated 2.3 million new cases of breast cancer in 2020, contributing to nearly 12% of all new cancer cases, with 685 000 deaths in the same year.1 Breast cancer detection has increased due to improvements in screening techniques. The mortality rate has decreased in recent years in Western populations, especially in younger age groups,2,3 but breast cancer is still the leading cause of cancer-related deaths for women worldwide. Most early breast cancer (EBC) cases can be cured by multimodality treatment, although cure rates vary by clinical stage and subtype. 

Early breast cancer: ESMO Clinical Practice Guideline for diagnosis, treatment and follow-up†.

ABSTRACT Triple negative breast cancer (TNBC) continues to be the subtype of breast cancer with the highest rates of recurrence and mortality. The lack of expression of targetable proteins such as the estrogen receptor and absence of HER2 amplification have made relying on cytotoxic chemotherapy necessary for decades. In the operable setting, efforts to improve outcomes have focused on escalation of systemic therapy and a shift toward preoperative delivery followed by a response adapted approach to postoperative systemic therapy. An improved understanding of tumor biology has resulted in the identification of subsets of patients with specific molecular features, leading to testing and approval of multiple new targeted therapies for this disease. Furthermore, advances in drug development have led to the approval of antibody-drug conjugates that are redefining classification schemes for breast cancer. This review focuses on the modern management of TNBC, with particular focus on recent updates in the treatment of operable disease, and an overview of the most recent promising advances in the therapeutic landscape of metastatic disease. It discusses the practical challenges and unanswered questions resulting from the approval of neoadjuvant immunotherapy and shares an approach in the clinic on topics for which evidence is lacking. In addition, it provides a glimpse into the future, highlighting challenges and opportunities for biomarker based right-sizing of preoperative therapy, refining evaluation of response to preoperative therapy after surgery, early diagnosis and detection of relapse, and areas of needed research for metastatic TNBC.

Advances in systemic therapies for triple negative breast cancer

Results of the c-TRAK TN trial: a clinical trial utilising ctDNA mutation tracking to detect molecular residual disease and trigger intervention in patients with moderate and high-risk early stage triple negative breast cancer.

The 18th St Gallen International Breast Cancer Conference held in March 2023, in Vienna, Austria, assessed significant new findings for local and systemic therapies for early breast cancer with a focus on the evaluation of multimodal treatment options. The emergence of more effective, innovative agents in both the preoperative (primary or neoadjuvant) and post-operative (adjuvant) settings has underscored the pivotal role of a multidisciplinary approach in treatment decision making, particularly when selecting systemic therapy for an individual patient. The importance of multidisciplinary discussions regarding the clinical benefits of interventions was explicitly emphasized by the consensus panel as an integral part of developing an optimal treatment plan with the 'right' degree of intensity and duration. The panelists focused on controversies surrounding the management of common ductal/no special type and lobular breast cancer histology, which account for the vast majority of breast tumors. The expert opinion of the panelists was based on interpretations of available data, as well as current practices in their professional environments, personal and socioeconomic factors affecting patients, and cognizant of varying reimbursement and accessibility constraints around the world. The panelists strongly advocated patient participation in well-designed clinical studies whenever feasible. With these considerations in mind, the St Gallen Consensus Conference aims to offer guidance to clinicians regarding appropriate treatments for early-stage breast cancer and assist in balancing the realistic trade-offs between treatment benefit and toxicity, enabling patients and clinicians to make well-informed choices through a shared decision-making process. 

Understanding breast cancer complexity to improve patient outcomes: The St. Gallen International Consensus Conference for the Primary Therapy of Individuals with Early Breast Cancer 2023.

In patients with early-stage triple-negative breast cancer, the phase 3 KEYNOTE-522 trial showed significant improvements in pathological complete response and event-free survival with the addition of pembrolizumab to platinum-containing chemotherapy. Here we report the final results for overall survival. 

Overall Survival with Pembrolizumab in Early-Stage Triple-Negative Breast Cancer

Long-term efficacy and safety of addition of carboplatin with or without veliparib to standard neoadjuvant chemotherapy in triple-negative breast cancer: 4-year follow-up data from BrighTNess, a randomized phase 3 trial.

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Long-term efficacy and safety of addition of carboplatin with or without veliparib to standard neoadjuvant chemotherapy in triple-negative breast cancer: 4-year follow-up data from BrighTNess, a randomized phase 3 trial.