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Let's Talk Health

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Introducing Let's Talk Health, an initiative from Apollo Hospitals, where our endeavor is to share knowledge which you can use to keep yourself and your family fit & healthy.

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What Is Thyroid Cancer?

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Thyroid malignancy is the most common endocrine malignancy. The cancer accounts for more than 90 per cent of all endocrine malignancies, but represents only about one per cent of all human cancers.

The worldwide incidence of thyroid cancer is approximately 1,40,000. The excellent long-term survival rates seen in patients who have thyroid cancer is reflected in the relatively small number of disease-specific deaths attributable to thyroid cancer compared with other malignancies.

Recently, there has been an increase in the number of Thyroid cancer cases around the world. However, evidence supports that the increase in the cancer appears due to improved detection rather than an increase in the true occurrence, and may reflect differences in access to healthcare.

Unlike most head and neck tumours, thyroid cancer is more common in women and often follows a protracted natural history. Thyroid nodules, which are a common problem, are prevalent in five per cent of women and one per cent of men in iodine sufficient parts of the world. The clinical importance of thyroid nodules rests with the need to exclude thyroid cancer, which occurs in five to 15 per cent of the population, depending on age, sex, radiation exposure history, family history, and other factors.

Types of thyroid cancers

Thyroid cancers encompass varied histologies ranging from indolent to aggressive. They may be classified into:

  • Differentiated carcinomas, such as papillary carcinoma, follicular carcinoma and Hurthle cell carcinoma account for 90 per cent of the Thyroid cancers diagnosed.
  • Medullary cancer arising from the parafollicular cells account for  three per cent.
  • Anaplastic (undifferentiated) carcinoma.

Symptoms

Although it can be seen at any age, the median age in diagnosis is close to 45 years of age. Most patients have an asymptomatic painless mass in the thyroid.

Clinical features that should raise the pretest probability of malignancy are:

  • Rapid growth
  • Suspicious criteria by ultrasonographic examination
  • Vocal cord paralysis
  • Family history of thyroid cancer
  • Prior history of radiation exposure during childhood
  • Hard fixed nodule
  • Palpable cervical lymphadenopathy

Evaluation

  • Fine-needle aspiration (FNAC) has the highest sensitivity and specificity for identification of malignant thyroid nodules. Thyroid function tests are almost uniformly normal. Even though FNAC is highly sensitive and specific, follicular thyroid cancers can’t be diagnosed by FNAC.
  • A surgical biopsy or a hemithyroid specimen is required for a confirmatory diagnosis.
  • Ultrasound evaluation or CT scan imaging is required to document the extent of the primary disease and to exclude any nodal involvement in the neck.

Treatment

  • Thyroidectomy: For differentiated thyroid cancer of more than one cm, total (near total) thyroidectomy is the preferred operation.
  • Lymph node dissection is carried out only on patients who have known lymph node metastases detected on preoperative staging or intraoperatively.
  • Role of radioactive iodine: Radioactive iodine (RAI) ablation is carried out one to four weeks after surgery in most papillary thyroid cancers greater than one cm.
  • Role of external beam irradiation in initial therapy: External Beam Radiation Therapy (EBRT) is most often used for unresectable tumours that do not concentrate RAI, or for older patients above 45 years, who have evidence of gross extrathyroidal extension of the tumour into surrounding structures that are likely to have microscopic or small volume macroscopic disease that is not amenable to RAI therapy.
  • Role of chemotherapy is usually palliative in the treatment of thyroid cancers.
  • Monitoring for recurrent/persistent disease is carried out with six-monthly thyroglobulin (Tg) estimation and ultrasonography
  • Medullary thyroid cancers are an aggressive variety with high propensity for nodal involvement, and hence the treatment involves total thyroidectomy with lymph node dissection.
  • External beam radiotherapy is advocated for treating surgically unresectable residual or recurrent disease.
  • Adjuvant irradiation is recommended for extrathyroidal disease, extensive nodal involvement, or extracapsular spread.
  • Post treatment monitoring for recurrent disease is done with serum calcitonin estimation.
  • Treatment results for anaplastic carcinoma are discouraging. Despite the employment of various aggressive treatment strategies that consist of surgery, radiation therapy, chemotherapy, or combinations of the three, almost all patients with this disease die a cancer- related death. The median survival of anaplastic thyroid cancer is two to six months, and only a few patients have survived for more than 12 months. Hence the goal of treatment is usually palliative.

Most people who thyroid cancer it do very well, because the cancer is usually found early and the treatments work well. After it is treated, thyroid cancer may come back, sometimes many years after treatment.
To know more regarding Thyroid cancer, visit: https://www.apollohospitals.com/departments/cancer/organ-cancer/thyroid-cancer

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