RecruitingNCT06931769

TAO-Towards Optimal (Neo)Adjuvant Systemic Therapy of Stage III Triple-negative Breast Cancer

Sponsor

The Netherlands Cancer Institute

Enrollment

100 participants

Start Date

Nov 6, 2025

Study Type

OBSERVATIONAL

Conditions

Breast Cancer

Summary

This prospective, national, multi-centre study will include patients with stage III triple-negative breast cancer (TNBC) who are planned to start with standard (neo)adjuvant systemic treatment. The study will gather clinico-pathological, treatment and follow-up information of participating patients through Dutch databases. Participating patients will be asked to complete cancer specific and more generic quality of life questionnaires at seven time points during and after their anticancer treatment in a mobile application. For all patients who have consented to additional blood collection, to assess the course of dynamic ctDNA during (neo)adjuvant chemotherapy and its relation with outcome, two tubes will be collected at four different time points.

Eligibility

Min Age: 18 Years

Inclusion Criteria8

Patients aged 18 years or older
Histologically confirmed adenocarcinoma of the breast
Assumed clinical or pathological stage III (TNM) breast cancer
Breast tumor must be:
HER2-negative: i.e. either score 0 or 1 at immunohistochemistry or score 2 at immunohistochemistry and negative at in situ hybridization (ISH, CISH or FISH)
Hormone receptor negative i.e. an estrogen receptor (ER) of \<10% and progesterone receptor (PR) of \<10%.; or in case of a histological grade III tumor an ER of \<50% and a PR of \<50%.
Patients are planned to receive the complete standard of care in the Netherlands; neo-adjuvant chemotherapy according to local practise
Participating patients have to be able to use a mobile phone, tablet, laptop and/or computer and understand the Dutch language

Exclusion Criteria3

Evidence of distant metastases. Staging examinations should have been performed according to Dutch national guidelines.
Patients who are only treated systemically in the adjuvant setting
Participation in another clinical study with an treatment intervention during the course of this study.