High Intensity Focused Ultrasound Guided by MRI as Thermic Destruction in Primitive Small Size Breast Cancer

Overview

This is a non-randomized, prospective phase II trial evaluating an innovative treatment, focused MRI-guided ultrasound, as thermic destruction in primitive small size breast cancer.

Conservative Breast Treatment (BCT) : The reference treatment for patients with stage T1 breast cancer is a partial mastectomy followed by radiotherapy (breast). This is a conservative treatment (BCT). Indeed, the survival results of this combined treatment are equivalent to those observed after a total mastectomy alone and is an aesthetically and psychologically more acceptable proposition for patients. Adjuvant radiotherapy is an essential component of the success of conservative therapy most likely due to the impossibility of surgical treatment of removing all microscopically viable cancer cells. Indeed, in the absence of radiotherapy, partial mastectomy shows a local recurrence rate of 20-40% in case of N0 and 25-50% in case of N + on long-term follow-up data. The results of the literature are very variable according to the length of the follow-up and the population studied but the adjuvant radiotherapy clearly allows to increase the rate of local control. It reduces local recurrences to 10% at 12 years in the case of radiotherapy in the breast and 6% in case of boost on the tumor area. The high sensitivity of breast MRI and emerging issues. The development of breast MRI revealed the incidental discovery of 10 to 40% of additional breast cancer in patients initially explored by mammography and ultrasound standards. These cancers discovered at early stages and of small size complicate the strategy of local management and incite to develop techniques alternative to the surgery. Several minimally invasive treatments for the local treatment of breast cancers are being studied: BLES (Breast Lesion Excision Sample), cryotherapy, radiofrequency, laser and microwaves. Among them, focused ultrasound offers a completely non-invasive heat ablation technique. High intensity focused ultrasound (FUS) and magnetic resonance imaging (MRI) guidance = FUS-MRI High intensity focused ultrasound thermal ablation is an attractive treatment modality for solid tumors because it does not require incision. Moreover, coupled with magnetic resonance, it offers precise targeting and control destruction. An ablation procedure begins with the acquisition of a series of MRI images centered on the organ to be treated. The radiologist loads the images onto the processing machine and identifies the target volume to be destroyed by segmenting it from the MRI images. The console provides a treatment plan with the necessary parameters to efficiently process the defined region. High intensity focussed ultrasonic destruction is possible due to the elevation of temperature at the focal point. By analogy, one can compare the technique to the use of a magnifying glass to focus the sun's rays and trigger a flame. In ultrasound diagnostic ultrasound is used without convergence of beams. In the therapeutic application, it is the focusing at a point and the use of high intensities which make it possible to deliver energy in the form of heat. This step is called "sonication". Sonication heats the tissue between 65 and 85 ° C in the well-defined region of the focal point and causes tissue thermo-coagulation. MRI images acquired during heating allow real-time monitoring of the rise in temperature. This makes it possible to check the position of the sonication and the size of the zone thus coagulated. The sonications are thus repeated at multiple adjacent points to cover the prescribed ablation volume. This combination of FUS-MRI has already shown convincing results on bone, prostate and uterine fibroid tumors, so the hypothesis is that it has a potential interest in the conservative treatment of breast cancer. The Ex-Ablate 2000 system (trade name) It is a machine incorporating FUS-MRI technology. It consists of a high intensity focused ultrasound transducer mounted in the MRI examination table. With its precision and unique ability to follow ablation, Ex-Ablate has been used in many tumor contexts and has demonstrated its ability to provide significant tumor destruction on small volumes. On the breast, the system showed promising results in several Phase II protocols on the treatment of breast tumors with good aesthetic results and no major toxicity. These arguments justify the choice of using Ex-Ablate as a means of thermic destruction for small size breast cancer.

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Outcomes