Tall cell variant of papillary thyroid carcinoma: a reassessment and immunohistochemical study with comparison to the usual type of papillary carcinoma of the thyroid.

A review of 92 consecutive cases of papillary thyroid carcinoma diagnosed at The Methodist Hospital revealed 11 tall cell variant (TCV) cases in nine women and two men. There was a greater average age and larger tumor diameter of TCV cases compared with papillary thyroid carcinoma of the usual type (UPTC), but these differences were not statistically significant. Extrathyroidal extension of tumor was noted in nine of 11 TCV cases and was intraoperatively evident in five cases. The presence of extrathyroidal extension represented a statistically significant difference between TCV and UPTC (p = 0.0001) in a multivariate stepwise logistic regression analysis, with controls for variables of age, sex, tumor size, and lymph node metastases. In 11 TCV patients, tumor recurrence was present in two cases, and there was one tumor-associated death with 1 to 4 years of follow-up. Immunohistochemical stains for thyroglobulin, vimentin, keratins, and Leu-7 were positive in all TCV cases and in 16 of 16 UPTC. Immunoreactivity with antibodies to Leu M1 antigen, a myelomonocytic marker included in cluster designation group (CD 15), which is present in many adenocarcinomas, was present diffusely in all TCV, in contrast to UPTC (with sparse immunostaining in only one of 16 cases). Immunoreactivity with antibodies to ZC-23, an anti-carcinoembryonic antigen (CEA) monoclonal antibody with cross-reactivity to nonspecific cross-reacting antigen and biliary glycoprotein antigen, was present in all TCV but was not present in UPTC. COL-1, a CEA-specific monoclonal antibody, was nonimmunoreactive with all TCV and UPTC cases. Epithelial membrane antigen (EMA) was present in all TCV but was also present focally in eight of 16 UPTC, sometimes in a membranous pattern in epithelium surrounding cystic or hemorrhagic spaces. Strong immunoreactivity with antibodies to Leu M1 and EMA in papillary carcinomas of the thyroid has been associated with advanced stages of disease and tumor-associated mortality. The pattern of immunoreactivity in TCV is dissimilar to that in UPTC and is supportive evidence that TCV is a neoplasm that is distinct from papillary thyroid carcinoma of the usual type.

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