A breast cancer therapy based on MIT research originally intended for detecting missiles is documented in a new book by Alan J. Fenn, an MIT researcher and inventor of the technique.

The book, "Breast Cancer Treatment by Focused Microwave Thermotherapy" (Jones and Bartlett Publishers, 2007), includes a discussion of promising results from the latest clinical trials of the treatment.

Treating cancer with heat is not a new idea, but "scientists were having trouble using it to treat tumors deep within the body," said Fenn. Further, it's difficult to deliver the heat only to cancer cells without overheating normal tissue.

The microwaves in the new technique heat--and kill--cells containing high amounts of water and ions, or electrically charged atoms. Cancer cells typically have a high content of both, while healthy breast tissue contains much less. The outpatient procedure uses a single tiny needle probe to sense and measure parameters during therapy. Side effects appear to be minimal.

The first clinical study of the therapy involved 75 patients with early-stage breast cancer. Of the 34 patients who received the therapy previous to lumpectomy, none had viable cancer cells remaining at the surgical margins. Of the 41 patients who had a lumpectomy but did not receive the MIT therapy, four had cancer cells at the surgical margins.

This result is important for two reasons. First, additional breast surgery is commonly recommended for patients with cancer cells close to the edge of the lumpectomy surgical margin. Second, there is a higher risk of local recurrence of the breast cancer when cancer cells are found at the surgical margins. Fenn noted that all patients in both arms of the study received postoperative radiation treatment to reduce the risk of local recurrence.

Also presented in the new book are preliminary results for a study of the therapy in combination with preoperative chemotherapy for patients with breast cancer with large tumors. "In this small feasibility study of 28 patients, one of the principal objectives was to increase tumor shrinkage with the combined use of focused microwave thermotherapy and preoperative chemotherapy," Fenn said.

In this study tumors shrunk by approximately 50 percent more in women treated with both the MIT technique and chemotherapy, versus women treated with chemotherapy alone.

The results of both clinical studies will be presented at the 17th Annual National Interdisciplinary Breast Center Conference in Las Vegas, from Feb. 25-28.

Another, larger clinical study for patients with large breast cancer tumors is expected to begin later this year at six institutions in the United States and Canada.

Other potential clinical studies for treating recurrent breast cancer, ductal carcinoma in situ and non-malignant breast lesions with the MIT thermotherapy therapy, as well as its use to enhance anti-estrogen treatment for breast cancer prevention, are also described in the book.


Posted by: Betsy    Source

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