EVALUATION OF OBSERVERS VARIATION IN THE HISTOPATHOLOGIC DIAGNOSIS OF SOFT-TISSUE TUMORS

  • 1 January 1984
    • journal article
    • research article
    • Vol. 4  (4) , 267-271
Abstract
Cases (260) of soft tissue tumors referred to the CTRC (Canadian Tumor Reference Center) for diagnostic opinion were reviewed. These tumors were collected from 98 different hospitals within the 10 Canadian provinces and were submitted to a specialized panel of pathologists having a particular interest in this field. Tumors (22)of nonmesenchymal origin were discarded. The main problem posed by the contributors related to the histologic typing of overtly malignant and sarcomatous tumors (122/238). Comparing the diagnoses proposed by contributors and the panel, a consensus in terms of benign and malignant tumor was reached in 89% of the cases. Within this panel, there was consensus in 84% of the cases. Regarding the histologic typing, a consensus was reached between contributors and the panel in only 65% of the studied cases. Within the panel, there was a majority diagnosis in merely 62% of them. A mean of 3 different diagnoses were proposed for each case. Histologic typing of soft tissue tumors has only limited prognostic significance. The clinical staging comprising histologic grade, size, depth, local growth and metastases is essential to establish prognosis and treatment. Since certain tumors respond differently to treatment, a precise histopathologic diagnosis using immunohistochemistry and EM is mandatory.

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