Incidence and Mortality
Estimated new cases and deaths from thyroid cancer in the United States in 2014:
New cases: 62,980.
Carcinoma of the thyroid gland is an uncommon cancer but is the most common malignancy of the endocrine system. Differentiated tumors (papillary or follicular) are highly treatable and usually curable. Poorly differentiated tumors (medullary or anaplastic) are much less common, are aggressive, metastasize early, and have a much poorer prognosis...
Because unilateral disease is usually massive and often there is no expectation that useful vision can be preserved, up-front surgery (enucleation) is commonly performed. Careful examination of the enucleated specimen by an experienced pathologist is necessary to determine whether high-risk features for metastatic disease are present. These features include the following:[1,2,3,4,5]
Systemic adjuvant therapy with vincristine, doxorubicin, and cyclophosphamide or with vincristine, carboplatin, and etoposide has been used to prevent the development of metastatic disease in patients with certain high-risk features assessed by pathologic review after enucleation.[3,7,8]; [Level of evidence: 2A]
Conservative ocular salvage approaches
Conservative ocular salvage approaches, such as chemotherapy and local-control treatments, may be offered in an attempt to save the eye and preserve vision. Ocular salvage rates correlate with intraocular stage. In selected children with unilateral disease, the Reese-Ellsworth (R-E) Group was correlated with ocular outcomes. While the possibility of saving the eye without the use of EBRT was greater than 80% for children with R-E Group II or III disease, the ocular outcomes for children with R-E Group V eyes were poor, with less than 40% ocular salvage rates, even after the use of EBRT.
Caution must be exerted with extended systemic chemotherapy administration and delayed enucleation when tumor control does not appear to be possible, particularly for Group E eyes. Pre-enucleation chemotherapy for eyes with advanced intraocular disease may result in downstaging and underestimate the pathological evidence of extraretinal and extraocular disease, thus increasing the risk of dissemination.