📄 የNCCN የሕሙማን ትምህርት ጽሑፍ

Thyroid Cancer

Usually slow-growing and highly curable — know the signs

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📖 What Is Thyroid Cancer?

The thyroid is a butterfly-shaped gland in the front of the neck that produces hormones (T3 and T4) that regulate the body's metabolism, temperature, and energy use. Thyroid cancer develops when cells in the thyroid gland grow uncontrollably. The most common types are Papillary thyroid carcinoma (70–80% of cases — slow-growing and highly curable), Follicular thyroid carcinoma (10–15% — slightly more aggressive), Medullary thyroid carcinoma (arises from calcitonin-producing C cells), and Anaplastic thyroid carcinoma (rare but very aggressive).

🔍 Warning Signs & Symptoms

Most thyroid cancers are found as a painless lump. Other symptoms may include:

  • A painless lump or nodule in the front of the neck — often noticed by the patient or on routine examination
  • Swollen lymph nodes in the neck
  • Hoarseness or voice change — if the cancer presses on the nerve to the voice box
  • Difficulty swallowing (dysphagia) or breathing
  • Persistent cough not related to a cold
  • Note: Most thyroid nodules (over 90%) are benign — but any new nodule should be evaluated

🩺 Diagnosis

Ultrasound of the neck is the most important first test — it characterises the nodule (size, borders, presence of calcifications) and identifies suspicious lymph nodes. Thyroid function tests (TSH, T3, T4) check whether the thyroid is working normally; most thyroid cancers do not affect hormone levels. Fine-needle aspiration (FNA) biopsy: a thin needle is passed into the nodule under ultrasound guidance to obtain cells for cytological examination — this is the key diagnostic test. Molecular testing (BRAF mutation, RAS) may help classify indeterminate biopsies. CT or MRI is used to plan surgery and check for metastases.

📊 Staging

Thyroid cancer staging is unique — age at diagnosis affects the stage in papillary and follicular carcinomas. For patients under 55 years: Stage I (no distant metastases) and Stage II (any distant metastases). For patients 55 years and older: Stage I–II (confined to the thyroid), Stage III (moderate extension beyond thyroid), Stage IV (extensive spread). Medullary and anaplastic thyroid cancers use a different staging system. Even Stage IV papillary or follicular thyroid cancer can often be managed successfully.

💊 Treatment Options

NCCN Guidelines recommend:

  • Surgery (thyroidectomy) — Total or partial removal of the thyroid; primary treatment for most thyroid cancers
  • Lymph node dissection — Removal of nearby lymph nodes if cancer has spread to the neck
  • Radioactive iodine (RAI, I-131) therapy — After surgery, destroys remaining thyroid tissue and any metastatic thyroid cells (papillary and follicular types only)
  • Thyroid hormone suppression therapy — Levothyroxine at a dose that keeps TSH suppressed, reducing risk of recurrence
  • External beam radiation — For anaplastic thyroid cancer or tumours that cannot be removed
  • Targeted therapy — Lenvatinib, sorafenib for radioiodine-refractory differentiated thyroid cancer; vandetanib for medullary thyroid cancer
  • Active surveillance — For very small (<1 cm) papillary microcarcinomas with no high-risk features

💚 Life After Thyroid Cancer Treatment

After total thyroidectomy, patients must take levothyroxine (thyroid hormone tablets) for life. The dose is adjusted based on TSH blood tests — taken every 6–12 months. Thyroglobulin (Tg) blood test and ultrasound of the neck are used to monitor for recurrence. Most patients with papillary or follicular thyroid cancer return to completely normal lives. After radioactive iodine therapy, patients should follow radiation safety precautions (isolation for 3–5 days, avoid close contact with children and pregnant women). Ensure adequate calcium and vitamin D intake, as parathyroid glands near the thyroid may be affected by surgery.

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