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Better Scoring System Needed To Categorize Stages Of Mesothelioma

by Julia Samuel on February 3, 2016 at 12:47 PM
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Better Scoring System Needed To Categorize Stages Of Mesothelioma

Mesothelioma, an aggressive and deadly cancer that occurs in the layer of tissue that covers internal organs needs improved scoring system, suggests a new study.

The current scoring system incorporates such factors as the size of the tumor and whether it has spread to other parts of the body. The study's findings suggest that, in addition, tumor weight and volume "may be valuable components for staging malignant pleural mesothelioma."

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An improved scoring system could provide a more accurate prognosis and help guide treatment, said lead author Dr. Wickii Vigneswaran, Loyola University Medical Center and Loyola University Chicago Stritch School of Medicine. Dr. Vigneswaran has performed nearly 200 mesothelioma surgeries, and he is among only a handful of surgeons nationwide who treat mesothelioma surgically.

Staging a malignancy is an important prognostic tool and plays a fundamental role in patient management. The current classification system, known as tumor/node/metastasis (TNM), considers the size and extent of the tumor, the amount of spread to nearby lymph nodes and whether there has been metastasis (spread of cancer to other parts of the body).
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CT scans and MRIs used to determine TNM staging are more precise in measuring discrete tumors such as those in lung cancer. But TNM is less precise in staging mesothelioma, which is diffuse, varies in thickness and has a similar density to surrounding tissues. So Dr. Vigneswaran and colleagues examined whether measuring tumor volume also could predict outcomes.

The study included 116 patients (95 males and 21 females). The median age was 68, with an age range of 43 to 88. As the volume (and therefore the weight) of the tumor increased, survival decreased. The median survival was 26.94 months in patients with tumor volumes between 0 and 300 millimeters; 19.45 months for tumor volumes between 301 and 600 ml.; 12.68 months for tumor volumes between 601 and 900 ml. and 11.7 months for tumor volumes greater than 901 ml. (By comparison 901 ml. equals about 30.4 oz.) While not surprising, the finding that larger tumor volumes were associated with shorter survivals had not been demonstrated previously.

The finding that tumor volume and weight are significant predictors of survival needs further validation in larger, multicenter studies, Dr. Vigneswaran and colleagues reported.

Source: Medindia
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