FAMILIAL NON-MEDULLARY THYROID CARCINOMA

Area of Science:

• Oncology
• Genetics
• Endocrinology

Background:

• Familial non-medullary thyroid carcinoma (FNMTC) affects multiple first-degree relatives without predisposing factors like radiation.
• Non-syndromic FNMTC accounts for 95% of cases, with an unknown genetic basis and unclear clinical behavior.
• Understanding FNMTC is crucial due to its potential for aggressive presentation.

Purpose of the Study:

• To analyze the clinical manifestations of FNMTC.
• To compare FNMTC cases with sporadic papillary thyroid carcinomas in similar age groups.
• To identify differences in tumor characteristics and prognosis between familial and sporadic thyroid cancers.

Main Methods:

• Examined 22 non-syndromic FNMTC patients (parents and children groups).
• Compared FNMTC patients with age-matched sporadic papillary thyroid carcinoma groups (adult and young).
• Analyzed tumor size, TNM staging, invasiveness, multifocality, lymph node metastasis, treatment, and MACIS score.

Main Results:

• Younger patients, both familial and sporadic, exhibited larger tumors with higher metastatic and invasive potential.
• FNMTC patients showed a higher frequency of multifocal tumors compared to sporadic cases.
• FNMTC children presented with more advanced tumors (higher T2 stage, N1a-N1ab metastasis, multifocality, capsular invasion) than FNMTC parents and young sporadic cases.

Conclusions:

• Familial non-medullary thyroid carcinomas are generally more aggressive than sporadic forms.
• The aggressive nature of FNMTC is particularly pronounced in individuals with a direct parental diagnosis.
• Findings highlight the distinct clinical behavior of FNMTC, especially in younger patients with familial links.