Medullary thyroid carcinoma: surgical treatment advances.
Since medullary thyroid cancer (MTC) was first recognized as a distinct tumor in 1959, it became clear that MTC is more difficult to cure than papillary thyroid cancer and has higher rates of recurrence and mortality. MTC represents 5-8% of thyroid cancers. It derives from parafollicular cells of the ultimobranchial body derived from the neural crest. MTC secretes calcitonin and other hormonal peptides and is considered part of the amine precursor uptake and decarboxilation system. MTC may occur either as a hereditary or nonhereditary entity. Hereditary MTC can occur either alone as the familial MTC or as the thyroid manifestation of multiple endocrine neoplasia (MEN) type 2 syndromes (MEN 2A MEN 2B). Activating point mutations of the RET proto-oncogene have demonstrated to be causative of the familial form of medullary thyroid cancer, both isolated familial MTC and associated with MEN 2A and 2B. In the last 10 years, major improvements and new technologies have been proposed and applied in thyroid surgery; among these are molecular diagnosis with genetic screening and mini-invasive video-assisted thyroidectomy. The history of thyroid surgery starts with Billroth, Kocher and Halsted, who developed the technique for thyroidectomy between 1873 and 1910. Prophylactic surgery for patients carrying a positive RET proto-oncogene has proven to be highly effective in curing those likely to experience the development of MTC. Video-assisted procedures with central compartment dissection have proved feasible for patients carrying a positive RET proto-oncogene. This paper reviews relevant medical literature published in the English language on surgery of MTC in well-controlled trials. We discuss the particular ethical and legal issues that thyroid prophylactic surgery raises. Searches were last updated in February 2007.
Dionigi
Gianlorenzo
G
Department of Surgical Sciences, University of Insubria, Azienda Ospedaliero-Universitario, Fondazione Macchi 57, Varese, Italy. gianlorenzo.dionigi@uninsubria.it
Bianchi
Veronica
V
Rovera
Francesca
F
Boni
Luigi
L
Piantanida
Eliana
E
Tanda
Maria Laura
ML
Dionigi
Renzo
R
Bartalena
Luigi
L
D018276:Carcinoma, Medullary / Q000601:surgery*; D006801:Humans; D000090063:Proto-Oncogene Mas; D013964:Thyroid Neoplasms / Q000601:surgery*; D013965:Thyroidectomy