Cancer, Papillary Thyroid Carcinoma (PTC)


Article Author:
Faten Limaiem


Article Editor:
Thomas Mazzoni


Editors In Chief:
William Gossman


Managing Editors:
Avais Raja
Orawan Chaigasame
Carrie Smith
Abdul Waheed
Khalid Alsayouri
Trevor Nezwek
Radia Jamil
Patrick Le
Anoosh Zafar Gondal
Saad Nazir
William Gossman
Hassam Zulfiqar
Steve Bhimji
John Shell
Matthew Varacallo
Heba Mahdy
Ahmad Malik
Sarosh Vaqar
Mark Pellegrini
James Hughes
Beata Beatty
Nazia Sadiq
Hajira Basit
Phillip Hynes
Tehmina Warsi


Updated:
1/15/2019 6:58:47 PM

Introduction

Papillary thyroid carcinoma (PTC) is an epithelial malignancy showing evidence of follicular cell differentiation and a set of distinctive nuclear features. It is the most frequent thyroid neoplasm and carries the best overall prognosis.

Etiology

Known risk factors for PTC include:

Radiation exposure:The incidence of papillary thyroid cancer is greater in people who have a history of exposure to significant ionizing radiation. 

Childhood exposure:External low-dose radiation therapy to the head and neck during childhood, used in the 1940s to 1960s to treat various benign diseases, predispose to PTC. The average time from irradiation to the recognition of the tumor is approximately 10 years but may be longer than 30 years.[1] Medical Therapy:High radiation doses (> 2000 cGy) used in the treatment of malignant diseases have also been associated with an increased risk of PTC. Environmental exposure:The Chernobyl nuclear accident, which occurred on April 26, 1986, led to a 3- to 75-fold increase in the incidence of PTC in fallout regions, especially in younger children.

Genetics:

There are few familial syndromes associated with PTC, including familial adenomatous polyposis—Gardner syndrome, Werner syndrome, and Carney complex type 1. Familial PTC cases have been reported in 5% of all patients with PTC and may portend a more aggressive disease course.[2]

 There is also a higher incidence of PTC in regions with high dietary iodine intake and in patients who have preexisting benign thyroid disease.

Epidemiology

Papillary thyroid carcinoma is the predominant form of thyroid cancer accounting for 80-85% of all thyroid cancer cases  In a report based upon the Surveillance, Epidemiology, and End Results (SEER) database from 1975 to 2012, the incidence of PTC increased from 4.8 to 14.9 per 100,000.[3][4] Papillary thyroid carcinoma occurs predominantly in middle-aged adults with a 3:1 female-to-male ratio and the median age at presentation is 50 years. Even though rare in children, PTC is still the most common pediatric thyroid malignancy. It affects whites more commonly than blacks.[5]

Histopathology

Gross findings:

Grossly, PTC typically presents as an invasive neoplasm with poorly defined margins, a firm consistency, and a granular white cut surface. Calcifications may be present. The size is widely variable, with a mean diameter of 2-3 cm. Papillary thyroid carcinoma has three classification categories based on the size and extent of the primary lesion. Minimal carcinoma or occult carcinoma/micro-carcinoma tumors are 1.5 cm or smaller and show no evidence of invasiveness through the thyroid capsule or to cervical lymph nodes. These lesions are typically nonpalpable and are usually incidental findings during operative or autopsy examination. Intra-thyroid tumors are greater than 1.5 cm in diameter but remain confined to the thyroid gland with no evidence of extra-thyroid invasion. Extra-thyroid tumors extend through the thyroid capsule to involve the surrounding viscera.[6]

Microscopic findings:

The two cardinal morphological features of conventional PTC are the papillae and the nuclear changes. The papillae are composed of a central fibrovascular stalk covered by a neoplastic epithelial lining. The papillae may be long, straight, or arborizing; arranged in a parallel, regimented fashion; short and stubby, or tightly packed. The thickness and composition of the papillary stalk are variable. The stalk is usually made up of loose connective tissue and variously sized thin-walled vessels.[7]

The diagnosis of papillary carcinoma has as its basis the nuclear morphology of a thyroid neoplasm. The existence of multiple architectural variants proves the irrelevance of architecture. The following constellation of features characterize the diagnostic nuclear morphology [7]:

  1. Enlarged and elongated nuclei with crowding and overlap
  2. Irregular nuclear contour
  3. Chromatin clearing with peripheral margination of chromatin, giving rise to what has been described as Orphan Annie Eye nuclei
  4. Multiple micro-nucleoli located immediately underneath the nuclear membrane
  5. Nuclear grooves resulting from irregularity of nuclear contour seen in 2 dimensions
  6. Intranuclear cytoplasmic pseudo-inclusions from the accumulation of cytoplasm in prominent nuclear grooves

Immunohistochemical Findings:

Immunohistochemistry is seldom of value in diagnosing PTC although it may play a role in metastatic disease. The neoplastic cells are strongly and diffusely immunoreactive with keratin, CK7, thyroglobulin, TTF1, and PAX8, while other markers (HBME-1, Galectin-3, S100 protein, CITED1, CK19) yield variable results.[8]

History and Physical

Papillary thyroid carcinoma usually presents as an asymptomatic (painless) thyroid mass with or without enlargement of regional (cervical) lymph nodes. Hoarseness and dysphagia occur in approximately 20% of cases, signaling recurrent laryngeal nerve involvement with vocal cord paralysis or tracheal compression. Nodal metastases in the lateral neck are reported in 27% of patients at presentation most often originating from tumors in the ipsilateral thyroid lobe.[9]

Evaluation

Fine needle aspiration:

It is often is the initial diagnostic method used in the detection of PTC. Fine-needle aspiration specimens from conventional PTC are usually cellular and may show papillary structures, monolayer sheets, and 3D groups in a background of watery or thick so-called ropy colloid, nuclear or calcific debris, macrophages, and stromal fragments. The individual tumor cells are enlarged, elongated, or oval, with eosinophilic cytoplasm. The nuclei show elongation, membrane thickening, chromatin clearing, grooves, and pseudo-inclusions. These tumors usually show enlarged follicular cells arranged in monolayer sheets and follicular groups in a background of thin and thick colloid.[10][11]

Laboratory tests: 

Thyroid function testing has limited utility in the diagnosis of PTC because most patients have normal thyroid function.[12]

Radiographic features:

On thyroid scan, PTCs typically appear as cold (hypo-functioning) nodules, but rarely can appear as hot (hyperfunctioning) nodules.

Ultrasound examination is the imaging modality of choice for PTC. Sonographic features include a hypoechoic or isoechoic solid nodule with irregular or poorly defined margins, micro-calcifications, taller-than-wide shape, and disorganized internal vascularity. Ultrasound findings are also invaluable for guiding fine-needle aspiration biopsy of abnormal nodes.

Other imaging modalities, including CT, MRI, and FDG-PET/CT, may be needed to assess the extent of extra-thyroidal extension, to evaluate the presence of substernal masses, to detect recurrent tumors, and to improve diagnostic accuracy.[13]

Treatment / Management

 Surgery:

Primary treatment decisions have as their basis a preoperative risk assessment that includes clinical, imaging, and cytological data. Choices depend on the location and extent of identifiable disease and the risk that unidentifiable disease foci are also present. With increasing emphasis on risk-stratified management, the treatment approaches recommended by the 2015 ATA guidelines are more conservative than in the past.[14] A lobectomy is an option for unifocal tumors smaller than 4 cm with no evidence of extra-thyroidal extension or lymph node metastasis. For patients with PTC >4 cm, or with gross extra-thyroidal extension (clinical T4), or clinically apparent metastatic disease to nodes (clinical N1) or distant sites (clinical M1), the initial surgical procedure should include a near-total or total thyroidectomy and gross removal of all primary tumor unless there are contraindications to this procedure. If surgery is chosen for patients with thyroid cancer <1 cm without extra-thyroidal extension and cN0, the initial surgical procedure should be a thyroid lobectomy unless there are clear indications to remove the contralateral lobe. Thyroid lobectomy alone is sufficient treatment for small, unifocal, intrathyroidal carcinomas in the absence of prior head and neck radiation, familial thyroid carcinoma, or clinically detectable cervical nodal metastases.[14] Prophylactic central-compartment neck dissection (ipsilateral or bilateral) should be a consideration in patients with PTC with clinically uninvolved central neck lymph nodes (cN0) who have advanced primary tumors (T3 or T4) or clinically involved lateral neck nodes (cN1b), or if the information will be used to plan further steps in therapy.

Adjuvant Radioiodine Therapy:

After thyroidectomy, radioiodine is the therapy of choice in patients with PTC to ablate residual normal thyroid tissue. 

Radioiodine therapy is indicated  in the following cases [15]:

  • Patients with tumor >2 cm and one of the following risk factors: gross extra-thyroidal extension, age >45 years, lymph node and distant metastases
  • Patients with tumor <2 cm and distant metastasis

Thyroid Hormone Treatment:

After thyroidectomy, patients require lifelong thyroid hormone therapy, usually as monotherapy with levothyroxine (LT4). Since TSH can promote the growth of remaining PTC cells, the dosage of LT4 should initially be high enough to achieve a suppression of thyrotropin. The thyroid function should be checked after 6 to 8 weeks. Depending on the result, the dosage should be adjusted; the use of TSH suppressive therapy should merit careful consideration since it carries an increased risk of complications.[14]

Differential Diagnosis

The primary differential diagnoses of PTC are:

  • Reactive changes following fine-needle aspiration.[16] This condition characteristically shows nuclear enlargement, chromatin clearing, and micro-nucleoli similar to nuclei of PTC.
  • Severe chronic lymphocytic thyroiditis, where the reactive atypia attributed to inflammation results in nuclear morphology similar to that of PTC.[17]
  • Other differential diagnoses include adenomatoid nodules, diffuse hyperplasia, dyshormonogenetic goiter, follicular adenoma, follicular thyroid carcinoma, medullary thyroid carcinoma, and metastatic tumors.

Staging

Several staging systems have been proposed for PTC and continue to evolve. The most commonly used are [18][19][18]:

  • TNM: Tumor size, node metastases, and distant metastases
  • AMES: Age at presentation, metastases, extent, size of the primary tumor
  • MACIS: metastases, completeness of surgical resection, age at presentation, invasion (extra-thyroidal), size
  • EORTC: European Organization for Research and Treatment of Cancer methodology
  • AGES: Age at presentation, grade of tumor, extent, size of the primary tumor

Any of these risk-stratification systems can be used to assign patients to the high-risk or low-risk group (MACIS is utilized only for PTC), based on well-established prognostic factors, but TNM and MACIS probably yield the most useful prognostic information.[20]

Prognosis

Although PTC frequently metastasizes to regional lymph nodes, it still generally carries an excellent prognosis. There are, however, several clinicopathological and background features that can lead to a poor prognosis.[21]

Poor prognostic factors of PTC include:

  • Older age at diagnosis
  • Large tumor size
  • Extra-thyroidal growth
  • Male sex
  • Less differentiated or solid areas, vascular invasion, and aneuploid cell population
  • Subtypes of PTC that associate with a more aggressive clinical behavior: tall cell variant, diffuse sclerosis variant, solid variant, and follicular variant

Complications

Extra-thyroidal extension:

Extra-thyroidal extension occurs in 8% to 32% of cases.[22]

Local or regional recurrences:

Local or regional recurrences occur in 5 to 15% of patients with PTC.[23]

Distant metastases:

Distant metastasis occurs in only 1% to 25% mostly in the lungs and bones. Other less common sites are the brain, liver, and skin.[24]

Enhancing Healthcare Team Outcomes

Papillary thyroid cancer is ideally managed by a multidisciplinary team that consists of an endocrinologist, general surgeon, oncologist, radiation oncologist, and an internist. With early diagnosis and prompt treatment, the prognosis for most patients is excellent.


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Cancer, Papillary Thyroid Carcinoma (PTC) - Questions

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A 38-year-old female presents to the clinic for a routine visit. During the physical exam, a hard lump is discovered on her left neck. The mass is solid and does not move during swallowing. She denies smoking but claims she received a small dose of radiation for acne many years ago. What is the most likely cause of her mass?



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A 50-year-old female has a 2-centimeter thyroid nodule. Fine needle aspiration is done, and she is diagnosed with papillary carcinoma. Laboratories are ordered. Which of the following is the most appropriate next step in management?



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A female has discovered a small lump in her neck. Needle aspiration reveals a malignant lesion, and she undergoes a total thyroidectomy. Pathology reveals a cystic mass with papillary excrescences. Which of the following finding that may also be seen in this biopsy specimen?



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Which of the following is a causative factor for the development of thyroid carcinoma?



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Which of the following does not increase the risk of papillary thyroid cancer?



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Which of the following is not a microscopic characteristic of papillary thyroid carcinoma?



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Which of the following is the best biochemical marker to monitor possible recurrence after total thyroidectomy for papillary carcinoma?



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What is the preferred treatment for a 2.2-cm papillary carcinoma in the left lobe of a 27-year-old woman?



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Which of the following conditions can be diagnosed with almost 100% sensitivity and specificity using fine-needle aspiration?



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A 46 year old female is has several nodules palpated in the left lobe of the thyroid gland. There is no lymphadenopathy and on pathologic analysis each nodule show papillary structures with small, scattered, laminated, round calcifications. Select the other finding most likely seen in the tumors.



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A 45-year-old woman with a thyroid mass. Biopsy shows cells with optically clear nuclei and calcific deposits. She gave a history of childhood exposure to radiation. Which of the following is correct with regards to the most likely diagnosis?



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Which of the following patients with papillary thyroid carcinoma has the best prognosis?



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A female from Eastern Europe presents with complaints of a mass in her neck, which she noted while showering a few weeks ago. She has no symptoms and denies any recent infection, travel or use of any medications. Exam reveals a painless mass that is hard and measures 3 x 2 cm. The mass appears to be fixed and moves with the trachea during swallowing. There is no adenopathy present. Blood work including thyroid function studies is normal. While waiting for imaging studies, a core biopsy is performed, and the histology is shown in the image below. If this patient had been exposed to radiation from the Chernobyl disaster, what would be found?

(Move Mouse on Image to Enlarge)
  • Image 6134 Not availableImage 6134 Not available
    Image courtesy S Bhimji MD
Attributed To: Image courtesy S Bhimji MD



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Which of the following regarding papillary thyroid carcinoma is true?



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A 38-year-old female presents to the clinic for a routine visit. During the physical exam, a hard lump is discovered on her left neck. The mass is solid and does not move during swallowing. The patient claims she received a small dose of radiation for acne twenty years ago. Fine needle aspiration of the nodule was performed. Microscopic examination of the smears showed a few suspicious follicular epithelial cells with nuclear grooves, and cytoplasmic pseudo-inclusions. What is the most likely diagnosis?



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Which of the following regarding papillary thyroid carcinoma is false?



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A 24-year-old woman with a past medical history of familial adenomatous polyposis syndrome, presented with a 3-month-history of discomfort upon swallowing liquids and solids and hoarseness of voice. Physical examination was remarkable for a mildly enlarged thyroid gland and a palpable non-tender nodule in the right side of the neck. Thyroid function tests were normal. Thyroid ultrasound revealed a solid hypoechoic nodule on the right thyroid lobe measuring 1.8cm x 0.9cm x 0.5 cm with irregular borders and extrathyroidal extension. A fine needle aspiration biopsy was performed and showed isolated follicular cells which displayed irregular nuclear contour, chromatin clearing with peripheral margination, nuclear grooves and occasional intranuclear pseudo-inclusions. What is the most likely diagnosis?



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Which of the following regarding papillary thyroid carcinoma is false?



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Which of the following regarding papillary thyroid carcinoma is false?



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Cancer, Papillary Thyroid Carcinoma (PTC) - References

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