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• W2186092427 abstract "2SUMMARY An indeterminate thyroid nodule cytology result occurs about every sixth fine-needle aspiration. These indeterminate nodules harbor a 24% risk of malignancy (ROM); too high to ignore, but driving surgery where most nodules are benign. Molecular diagnostics have emerged to ideally avoid surgery when appropriate, and to trigger the correct therapeutic surgery when indicated, as opposed to an incomplete diagnostic surgery. No current molecular test offers both high sen sitivity and high specificity. A molecular diagnostic test with high sensitivity (e.g. Afirma Gene Expression Classifier sensitivity 90%) offers a high Negative Predictive Value when the ROM is relatively low, such as < 30%. Only such tests can “rule-out” cancer. In this setting, a molecularly benign result suggests the same ROM as that of operated cytologically benign nodules (~6%). Thus, clinical observation can replace diagnostic surgery; increasing quality of life and decrea sing medical costs. However, its low specificity cannot “rule-in” cancer as a suspicious result has a Positive Predictive Value (PPV) of ~40%, perhaps too low to routinely reflex to definitive cancer surgery. Conversely, high specificity tests (BRAF, RAS, PPAR/PAX-8, RET/PTC, PTEN) offer high PPV results, and only these tests can “rule-in” cancer. Here a positive molecular result war rants definitive therapeutic surgery. However, their low sensitivity cannot “rule-out” cancer and a negative molecular result cannot dissuade diagnostic surgery; limiting their cost-effectiveness. Whether or not there is a useful and cost-effective role to sequentially combine these approaches, or to modify existing approaches, is under investigation. Arq Bras Endocrinol Metab. 2013;57(2):89-97" @default.
• W2186092427 created "2016-06-24" @default.
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• W2186092427 date "2013-01-01" @default.
• W2186092427 modified "2023-09-27" @default.
• W2186092427 title "Molecular markers in the diagnosis of thyroid nodules Marcadores moleculares no diagnóstico de nódulos tireoidianos" @default.
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