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Health & Medicine for Senior Citizens

New Imaging Technique Speeds Removal of Non-Melanoma Skin Cancers

Provides same accuracy as current “gold standard” used in Mohs surgery minus the lengthy wait

Jan. 30, 2014 – Senior citizens, the most frequent victims of skin cancer, may find a common surgery for non-melanoma skin cancer, known as Mohs surgery, taking a lot less time. It typically achieves excellent results but can be a long process, as the surgeon successively removes the area of concern until the surrounding tissue is free of cancer. Now, NIBIB-funded researchers have developed a microscopic technique to analyze removed tissue rapidly right in the clinic - dramatically reducing the length, inefficiency, and expense of this procedure.

To determine whether further tissue removal is necessary in current procedures, the borders of the lesion must be processed in a laboratory to check for residual cancer tissue - a process that takes 20 to 45 minutes and is often repeated numerous times.

With approximately 3.5 million new cases per year in the U.S., Mohs surgery is a fairly common procedure that many people undergo repeatedly as new skin cancers appear. It can take one to three hours, or even longer depending on the size and location of the lesion.


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The process is lengthy because after a section of tissue is removed, it must be frozen and stained so it can be examined to ensure the borders are clear of residual tumor. Although highly effective, the current practice is labor intensive for surgeons and assisting staff, as well as lengthy and stressful for patients.

The time spent by surgical personnel and those analyzing the tissue in the lab increases the expense of the procedure, which has been estimated to cost $ 2-3 billion per year in the U.S.

NIBIB-supported researchers led by Milind Rajadhyaksha, Ph.D. at Memorial Sloan Kettering are using their expertise in optical imaging to improve this common procedure. Optical imaging is a technique that uses visible or near-infrared light to obtain detailed images of organs, tissues, and cells.

The investigators developed a new pathological assessment technique called strip mosaicing confocal microscopy -- a type of optical imaging -- that can provide high resolution images during removal of basal cell and squamous cell carcinomas (non-melanoma skin cancers) and perhaps other tumors of the skin.

The new technique uses a focused laser line that performs multiple scans of the tissue to obtain image “strips” that are then combined, like a mosaic, into a complete image of the excised tissue. The process takes only 90 seconds and eliminates the need to freeze and stain the tissue samples for analysis -- a process that takes 20 to 45 minutes.

The new imaging technique was tested on 17 patients with 34 tissue samples. The overall image quality was excellent, with high resolution and contrast, providing for good visibility of the epidermis and dermis.

Researchers compared the new technique against the Mohs approach with its frozen section processing. The new technique achieved a promising 94% in preliminary measures of sensitivity and specificity for detecting skin cancer margins, which is comparable to the “gold standard” Mohs procedure.

These preliminary results demonstrated that the optical technique could potentially detect skin cancer margins with the same accuracy as the conventional frozen section technique.

The results of this study were obtained under laboratory conditions; a clinical trial is now being conducted to demonstrate the feasibility of using this technique in the clinical setting, the ultimate goal of the research group.

Steve Krosnick, M.D., NIBIB director for the Program for Image-Guided Interventions, explains the utility of the optical system: “The technology is particularly well-suited for Mohs-trained surgeons, who are experts at performing excisions and interpreting images of tissue samples removed during the Mohs procedure. Image quality, ability to make accurate interpretations, and time savings will be key parameters for adoption of the system in the clinical setting, and the current results are very encouraging.”

The research was conducted by a team consisting of two laboratories at Memorial Sloan-Kettering Cancer Center, New York, NY, as well as students from Bronx High School of Science, New York and Livingston High School, Livingston New Jersey. The work is published in the October 2013 issue of the British Journal of Dermatology.


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