Laser-light Testing Shows Spreading Cancer

Photo: Laser

The researchers say their crisscrossing optical images, made by shining a laser back and forth across a biopsied tissue sample a few millionths of a meter thick, can potentially be used with other tests to more accurately determine the need for lymph node biopsy and removal in women at risk of metastatic breast cancer.

In what is believed to be the first study to measure minute changes in tumor connective tissue fibers, researchers found that eight women whose cancers had spread beyond the breast through the body's lymphatic system had about 10 percent more densely packed and radially spread-out collagenous structural proteins than six women whose cancers had not yet spread. Collagen fibers in the non-metastasized tumors, also obtained during breast biopsy, were more diffuse and arranged in a transverse or horizontal pattern. All 14 women in the study had aggressive, malignant breast cancer.

In the new report, researchers say that if these "proof of principle" findings hold up in testing now under way in hundreds more women with or without metastatic breast cancer, then their new optical imaging tool could simplify testing for spreading disease and help people avoid unnecessary lymph node surgery.

"Our new diagnostic technique has the potential to help reassure thousands of breast cancer patients that their cancers have not spread to other organs, and could help them avoid the risks and pain currently involved in direct inspections of lymph nodes for the presence of cancerous cells," says study senior investigator Doctor Kristine Glunde.

Women with denser tumor fiber patterns would likely stand a greater chance of needing lymph node biopsy and removal and inspection of such tissue for malignant cells, says Glunde.

She says complications from lymph node biopsy and more invasive dissection include risk of infection, pain, severe swelling and leakage of lymph fluid around the armpit, as well as stiffening in the arm, which can be permanent. An estimated 230,000 Americans were diagnosed in 2011 with invasive breast cancer, while another 57,000 were found to have noninvasive, or in-situ breast cancer.

COMPAMED.de; Source: Johns Hopkins Medicine