What is Polymorphous Adenocarcinoma?

Polymorphous Adenocarcinoma (PAC), formerly referred to as Polymorphous Low-Grade Adenocarcinoma (PLGA), is a very rare form of salivary gland cancer that primarily occurs in minor salivary glands, such as those in the palate. This is normally a very slow-growing cancer of low grade that usually has an excellent prognosis if it is diagnosed early enough and receives appropriate treatment. PAC is unlikely to spread to distant sites in the body; however, it may recur locally if not totally excised.

Polymorphous Adenocarcinoma (PAC) is a cancerous tumor that arises from epithelial cells of salivary glands. "Polymorphous" describes a tumor with different microscopic growth patterns despite consisting of uniform tumor cells.

According to the World Health Organization (WHO), Polymorphous Adenocarcinoma (PAC) is now referred to as Polymorphous Low-Grade Adenocarcinoma.

PAC is classified as low-grade cancer due to the fact that it is generally slow-growing.

Where Do The Salivary Glands Usually Get Impacted?

Most of the time, Polymorphous Adenocarcinoma occurs in the minor salivary glands.

Some of the locations where they can occur are as follows:

• Hard palate (most common location)
• Soft palate
• Mucosa of the Cheeks (buccal mucosa)
• Upper lip
• Retro-molar pad (behind the molar tooth)
• Base of the tongue (rarely occurs)

This rarely affects the major salivary glands, such as the parotid or submandibular glands.

What Are The Causes Of Polymorphous Adenocarcinoma?

The precise causes of PAC remain unclear.

Studies have found that some genetic changes are involved, including mutations in the PRKD gene family, mainly the PRKD1 gene, in most patients.

In most cases, no environmental or genetic factor is found for this cancer.

Smoking and alcohol, which cause other head and neck cancers, have not been related to this cancer till now.

Who Is At Risk by Polymorphous Adenocarcinoma?

People with higher chances of Polymorphous Adenocarcinoma include:

• Individuals aged 40-70 years
• Slightly more females than males
• People with cancer arising from the minor salivary glands

Children are not usually affected by PAC.

What Are the Symptoms of Polymorphous Adenocarcinoma?

Because PAC is a slowly developing disease, symptoms usually develop slowly over months or even years.

Typical symptoms include:

• Painless mass in the mouth
• Swelling in the palate
• Mass in the mouth, which is persistently present and gradually increases in size
• Difficulties wearing dentures because of swelling
• Mild pain or discomfort
• Ulceration (sometimes)
• Numbness or tingling sensation if the nerves are involved

Most of the patients have no pain before the mass increases in size.

What is the Behaviour of Polymorphous Adenocarcinoma?

Polymorphous adenocarcinoma develops slowly as a rule.

The following features should be considered:

• Slow development
• Low risk of distant metastasis
• Tendency to grow into the neighboring structures
• Frequent growth along the nerves (perineural growth)
• Very good prognosis after complete treatment

Sometimes the disease may recur locally, but it can be prevented by complete surgery.

How is Polymorphous Adenocarcinoma Diagnosed?

Diagnosis is performed using clinical examination and special investigations.

Clinical Examination

A head and Neck Surgeon or ENT Specialist examines:

• Size and localization of the oral swelling
• Spread into the neighboring structures.
• Neck lymph nodes
• Cranial nerves function

Imaging tests include:

• Contrast-enhanced CT scan.
• MRI scan
• Ultrasound (in selected cases)
• PET-CT scan for advanced and recurrent cases

The MRI scan is very helpful in assessing soft-tissue and nerve involvement.

Biopsy

A biopsy in the form of an incisional/core biopsy is often done prior to definitive therapy to confirm the diagnosis.

Histopathology Examination

The tumor will then be examined for:

• Tumor size
• Margins of surgery
• Perineural invasion
• Lymphovascular invasion
• Histopathologic type of tumor
• Disease stage

How Can Polymorphous Adenocarcinoma Be Treated?

It all depends on the location, size, and extent of the tumor.

Surgery

The first and most successful treatment modality is surgery.

Surgery aims at removing the tumor completely with adequate margins and preservation of normal oral functions when feasible.

In some locations, surgery may involve:

• Wide local excision
• Partial palatal resection
• Reconstruction in cases where needed

Neck Dissection

Prophylactic removal of neck lymph nodes is not done routinely due to the rare metastasis to lymph nodes.

Neck dissection is done when enlarged or suspect lymph nodes are found.

Radiotherapy

Radiotherapy could be recommended in cases where:

• Surgical margins are involved or are very close.
• Recurrence of the tumor
• Extensive perineural involvement
• Cannot perform complete surgical removal

Chemotherapy

Chemotherapy is not usually needed in most cases and is only used in advanced or metastatic cases.

Does Polymorphous Adenocarcinoma Metastasize?

Yes; however, metastasis is relatively rare.

Potential sites of spread include:

• Nearby lymph nodes (very rare)
• Lungs (very rare)
• Bones (very rare)

The majority of patients have localized tumors that can be successfully managed through surgery.

What Is the Prognosis for Polymorphous Adenocarcinoma?

The prognosis is generally good.

Prognostic factors include:

• Complete surgical removal
• Tumor size
• Surgical margins
• Recurrence of the tumor
• Perineural involvement

The great majority of patients do very well, with most patients being cured through surgery alone.

What is the Post-treatment Course for Polymorphous Adenocarcinoma ?

Follow-up appointments remain very important, as recurrence can occur years later.

Follow-up is done through:

• Frequent physical examinations
• Imaging if necessary
• Monitoring for recurrence
• Function of mouth and healing

Any oral swelling needs to be reported.

Frequently Asked Questions (FAQs)

Can Polymorphous Adenocarcinoma be cured?

Yes. Patients are usually successfully treated by surgery, especially in the early stages of the disease.

Is this a rapidly growing tumor?

No. PAC is described as a low-grade, slowly growing tumor of salivary gland origin with a good prognosis.

Can it come back?

Yes. Recurrence is rare in patients undergoing complete surgery; nevertheless, long-term follow-up is advised.

Do all patients require radiation therapy?

No. Only patients presenting with high-risk factors such as positive margins, recurrences, or wide perineural invasion require radiotherapy.

Can this cancer metastasize to the lymph nodes?

Yes, although lymph node metastasis is less common than in many other salivary gland cancers.

Why is long-term follow-up necessary?

As PAC is a slow-growing tumor, recurrence is possible several years after treatment. Follow-up ensures the timely diagnosis of recurrence.

How to Prevent and reduce risk of Polymorphous Adenocarcinoma ?

Polymorphous Adenocarcinoma cannot be prevented. Nevertheless, any swelling, mass, or ulcer on the mucosa, especially of the palate, that does not heal within 2 weeks should be examined by a specialist. Early diagnosis and treatment ensure the best chances of cure.

Why choose Tender Palm Super-Speciality Hospital for Polymorphous Adenocarcinoma Treatment in Lucknow, India?

Tender Palm Super-Speciality Hospital offers advanced Polymorphous Adenocarcinoma treatment in Lucknow, India, at an affordable cost. We have a team of experienced head and neck surgeons and oncology specialists who provide accurate diagnosis and both non-surgical and surgical treatment options including surgical resection, radiation therapy, and comprehensive oncological management. Our Head and Neck Surgery and Oncology team has decades of experience in successfully treating Polymorphous Adenocarcinoma in Lucknow, India.

To seek an Expert consultation for Polymorphous Adenocarcinoma Treatment in Lucknow ,India:

Call us at +91-9076972161
Email at care@tenderpalm.com

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