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Renaming Papillary Microcarcinoma of the Thyroid Gland: The Porto Proposal

The 12th Annual Cancer Meeting held at the Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal, on March 3-5, 2003, was devoted to carcinomas of thyroid follicular cells. During the course of 3 days, a group of basic scientists, pathologists, and clinicians interested in thyroid neoplasia exchanged views about several important aspects of the biology, pathology, and behavior of these tumors. One of the items was the thyroid neoplasm that is currently designated as papillary microcarcinoma. Following a general discussion on the subject and the conclusion that a change in terminology ought to be considered, a working group composed of the 4 individuals listed as authors of this article met for the purpose of exploring the issue in more detail. A consensus was reached by the group to propose a new term for the entity. We would like to present to our fellow pathologists and to the medical community at large the rationale behind our choice, which we refer to as "the Porto proposal." Papillary carcinoma is the most common malignant tumor of the thyroid gland. In addition to the clinically detectable cases, the size of which ranges widely, there is a variant currently designated papillary microcarcinoma (PMiC), which has been defined as a papillary carcinoma measuring 1 cm or less in diameter [1,2]. This variant, also known as occult papillary carcinoma, latent papillary carcinoma,