Image-guided De-escalation of Neo-adjuvant Chemotherapy in HER2-positive Breast Cancer: the TRAIN-3 Study

Borstkanker Onderzoek Groep

Status and phase: Active, not recruiting; Phase 2

Conditions: Breast Cancer

Treatments: Drug: PTC-Pz

Study type: Interventional

Funder types: Other; NETWORK; Industry

Identifiers

NCT03820063

BOOG 2018-01

Details and patient eligibility

About

This is a multicenter, single arm, phase II study evaluating the efficacy of image-guided de-escalating neoadjuvant treatment with paclitaxel, Herceptin® (trastuzumab), carboplatin, and pertuzumab (PTC-Ptz) in stage II-Ill HER2-positive breast cancer.

Full description

High pathological complete response (pCR)-rates are seen using different neoadjuvant chemotherapy schedules with trastuzumab and pertuzumab in HER2-positive stage II - III breast cancer patients. Total pCR rates in breast and axilla have been described as high as 64%, and with an even higher rate of >80% in patients with HER2-positive and hormone receptor (HR) negative tumors. PCR is associated with better long-term outcomes in patients with HER2-positive breast cancer. Three year progression-free survival ranges between 85-90%. Neoadjuvant treatment of HER2-positive breast cancer typically consists of six to nine cycles of treatment. Longer duration of treatment is associated with higher pCR-rates but gives more toxicity. Pathological complete responses are sometimes seen after only 10-12 days of neoadjuvant treatment. It is therefore important to investigate which patients can safely be treated with less than six cycles of chemotherapy and who requires more than six cycles for maximum activity.

The radiologic response of a breast tumor after neoadjuvant therapy is predictive of the pathologic response, although the accuracy differs between breast cancer subtypes. It is hypothesized that patients with an early complete radiologic response may not benefit from additional chemotherapy and can be referred for early surgery. Patients who have not achieved pCR after early surgery despite radiologic complete response (rCR) are candidates for further adjuvant chemotherapy to complete the initially planned number of treatment cycles and maintain maximum treatment activity. Imaged guided de-escalation in which the number of treatment cycles is determined by the radiologic response could thus reduce toxicity in neoadjuvant treatment while maintaining activity.

This study will evaluate the efficacy of image-guided de-escalation of neoadjuvant chemotherapy in patients with HER2-positive breast cancer.

To maintain efficacy, patients who do not achieve pCR will complete a total of nine cycles taxane-containing chemotherapy followed by 14 cycles of treatment with adjuvant T-DM1. Patients who achieve early pCR will continue treatment with Herceptin® and pertuzumab to complete one full year of treatment.

Enrollment: 462 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Histologically confirmed primairy infiltrating breast cancer.
2. Stage II or Ill disease.
3. Overexpression and/or amplification of HER2 in an invasive component of the core biopsy.
4. Age <:18
5. ECOG Group performance status
6. LVEF >50% measured by echocardiography, MRI or MUGA
7. Known HR-status ( in percentages)

Exclusion criteria

1. Previous radiation therapy of chemotherapy
2. Pregnancy or breastfeeding
3. Evidence of distant metastases
4. Evidence of bilateral infiltrating breast cancer
5. Concurrent anti-cancer treatment or another investigational drug

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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462 participants in 1 patient group

PTC-Pz

Experimental group

Description:

* Paclitaxel 80mg/m2 administered intravenously on day 1 and day 8 * Herceptin® 6mg/kg administered intravenously on day 1 (loading dose 8mg/kg) or Herceptin® administered subcutaneously 600mg on day 1 * Carboplatin AUC 6mg•ml/min administered intravenously on day 1 * Pertuzumab 420mg administered intravenously on day 1 (loading dose 840mg) * Treatment cycles are repeated on day 22 Patients who do not achieve pCR will complete a total of nine cycles taxane-containing chemotherapy followed by 14 cycles of treatment with adjuvant T-DM1.

Treatment:

Drug: PTC-Pz