Circulating Tumor DNA as Marker of Therapeutic Efficacy in Breast Cancer Patients

Study Overview
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Brief Summary
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In nonmetastatic local advanced breast cancer patients, we are going to investigate whether circulating tumor DNA (ctDNA) detection can reflect the tumor response to neoadjuvant chemotherapy (NCT) and detect minimal residual disease after surgery.

Detailed Description
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Breast cancer is the most common malignant tumor in women worldwide, and chemotherapy is still the main method of breast cancer treatment. And for locally advanced breast cancer patients, neoadjuvant chemotherapy can further improve treatment efficacy, improve prognosis and increase the rate of breast conserving surgery. The persistence of a minimal residual disease at distant sites after the treatment of a localized breast cancer is a key parameter for posttreatment survival but cannot be reliably assessed by the current biological or radiological tools. Therefore, the prediction of the chemotherapy efficacy is very important. ctDNA, corresponds to fragmented DNA released into the blood stream by tumor masses, the detection and quantification of circulating tumor DNA (ctDNA) is a very promising tool that can assess tumor burden, response to therapy, and minimal residual disease. In this study, we wil collect breast cancer cases treated with neoadjuvant chemotherapy, draw blood and evaluate the efficacy each time before chemotherapy and after surgery, then measure the concentration of ctDNA in each sample. We will also analyze the demographic data,basic treatment and follow-up data including relapse, metastasis and survival.

Official Title
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Early Evaluation of Circulating Tumor DNA as Marker of Therapeutic Efficacy in Breast Cancer Patients During Neoadjuvant Chemotherapy

Conditions
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Breast Neoplasms

Intervention / Treatment
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* Other: ctDNA level during neoadjuant chemotherapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients pre- or post-menopausal must have histologically confirmed early stage/locally advanced invasive breast cancer; Tumor size ≥ 0.5cm (clinical or radiographic measurements); Any nodal status allowed; Age > 18 years old; Felt to be a possible candidate for neoadjuvant systemic therapy by their treating physician; ECOG score<=2; Exclusion Criteria: Known metastatic disease; With serious heart, lung, liver diseases; Poor cardiac function; Pregnant; Patients with other malignant tumor or treated before;

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| ctDNA level<br>ctDNA level during neoadjuant chemotherapy | Other: ctDNA level during neoadjuant chemotherapy<br>* Draw blood from each enrolled patient every time before chemotherapy and measure the ctDNA level in plasma.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The concentration of circulating DNA(ctDNA) | Take the blood each time before chemtherapy and measure the concentration of ctDNA | From date of neoadjuvant chemotherapy decided until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 100 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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ctDNA