Pancreatic Acinar Cell Carcinoma: What It Is and How It Is Treated

Written by Medicover Team and Medically Reviewed by Dr Kovvuru Bhaskar Reddy , Oncologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Pancreatic acinar cell carcinoma is a rare type of cancer that originates in the acinar cells of the pancreas, which produce digestive enzymes. This cancer can affect pancreatic function and may spread to other parts of the body.

The disease may cause digestive and systemic symptoms, and some tumors can produce excess pancreatic enzymes such as lipase. Early diagnosis and appropriate treatment are important for managing the condition and improving outcomes.

What are the Types of Pancreatic Acinar Cell Carcinoma?

Pancreatic acinar cell carcinoma is primarily classified based on the microscopic and molecular features of the tumor. Some tumors may contain mixed areas showing acinar and other types of differentiation.

Pure Acinar Cell Carcinoma: A malignant tumor showing predominantly or entirely acinar cell differentiation.
Mixed Acinar-Neuroendocrine Carcinoma: A rare tumor containing both acinar and neuroendocrine components.
Mixed Acinar-Ductal Carcinoma: A rare tumor containing both acinar and ductal differentiation.
Acinar Cell Carcinoma with Neuroendocrine Differentiation: Some acinar cell carcinomas may contain neuroendocrine cells or show limited neuroendocrine differentiation, which can be identified through specialized pathological testing.

What are the Symptoms of Pancreatic Acinar Cell Carcinoma?

Pancreatic acinar cell carcinoma can cause symptoms related to the location and size of the tumor. Some symptoms are nonspecific and may resemble those of other pancreatic conditions, which can make diagnosis challenging.

Some tumors may also produce excess lipase, which can lead to a rare lipase hypersecretion syndrome involving inflammation of fatty tissue and joints.

Symptoms of Pancreatic Acinar Cell Carcinoma:

Abdominal pain
Unexplained weight loss
Jaundice, which is less common than in some other pancreatic cancers
Nausea and vomiting
Fatigue
Changes in bowel habits, including diarrhea
Loss of appetite
Back pain

What are the Causes of Pancreatic Acinar Cell Carcinoma?

Pancreatic acinar cell carcinoma develops when genetic changes cause pancreatic acinar cells to grow and divide abnormally. The exact cause of these changes is not fully understood.

Because this cancer is rare, specific risk factors for acinar cell carcinoma are not as well established as those for pancreatic ductal adenocarcinoma. Some factors associated with pancreatic cancer in general may also be relevant.

Genetic changes that affect normal cell growth and division
Smoking
Chronic pancreatitis
Obesity or excess body weight
Diabetes
Older age
Inherited genetic conditions or family history of pancreatic cancer in some individuals

When to See a Doctor?

Consult a gastroenterologist or oncologist if persistent digestive or systemic symptoms occur, particularly unexplained weight loss, abdominal pain, jaundice, or changes in bowel habits. Early evaluation can help identify pancreatic disease and guide appropriate treatment.

Unexplained weight loss or loss of appetite
Persistent abdominal or back pain
Jaundice or persistent changes in bowel habits

Get medical help immediately if:

Severe abdominal pain with persistent vomiting
Rapid worsening of symptoms or severe weakness
Yellowing of the skin or eyes with worsening abdominal symptoms

These symptoms can indicate a serious pancreatic problem requiring prompt medical evaluation.

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How Is Pancreatic Acinar Cell Carcinoma Diagnosed?

Pancreatic acinar cell carcinoma is diagnosed using a combination of imaging studies, laboratory tests, and tissue examination. Doctors also consider the patient's symptoms and medical history when evaluating a suspected pancreatic tumor.

Imaging helps identify the location and extent of the tumor, while tissue examination is important for confirming acinar cell differentiation and distinguishing this cancer from other pancreatic tumors.

Imaging tests: CT scan, MRI, and endoscopic ultrasound (EUS) can help identify and characterize a pancreatic mass and assess whether the disease has spread.
Blood tests: Blood tests may assess liver function and pancreatic enzymes such as lipase. Tumor markers such as CA 19-9 may be measured, but they are not specific for pancreatic acinar cell carcinoma.
Biopsy: Endoscopic ultrasound-guided tissue acquisition may be performed to obtain a sample for microscopic examination and immunohistochemical testing.
Immunohistochemistry: Markers of acinar differentiation, such as trypsin and BCL10, can help confirm the diagnosis and distinguish the tumor from other pancreatic neoplasms.
Genetic and molecular testing: Molecular profiling may identify potentially treatable genetic alterations and help guide treatment in selected patients.

What are the Treatment Options for Pancreatic Acinar Cell Carcinoma?

Treatment for pancreatic acinar cell carcinoma depends on whether the tumor can be completely removed, its stage, and the patient's overall health. Because this cancer is rare, treatment is usually planned by a multidisciplinary team with experience in pancreatic cancers.

Surgery is the preferred treatment when the tumor is localized and can be completely removed. Chemotherapy may be used for advanced disease or in selected patients before or after surgery. Radiation therapy and molecularly targeted treatments may be considered in specific situations.

Surgery: Surgical removal of the tumor is the preferred potentially curative treatment for localized and resectable pancreatic acinar cell carcinoma.
Chemotherapy: Chemotherapy may be used before or after surgery in selected patients and is an important treatment option for unresectable or metastatic disease. Regimens containing fluoropyrimidines, platinum agents, or irinotecan may be considered by the oncology team.
Radiation Therapy: Radiation therapy may be considered for selected patients with locally advanced or unresectable disease or for symptom control, although its role in pancreatic acinar cell carcinoma is not as well established as surgery or systemic therapy.
Targeted Therapy: Molecular testing may identify genetic alterations that can potentially be treated with targeted medicines in selected patients.
Immunotherapy: Immunotherapy may be considered for tumors with specific biomarkers, such as microsatellite instability or mismatch repair deficiency.
Clinical Trials: Clinical trials may provide access to emerging treatments and are particularly relevant because pancreatic acinar cell carcinoma is rare and treatment evidence remains limited.

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What are the Risk Factors of Pancreatic Acinar Cell Carcinoma?

Pancreatic acinar cell carcinoma is rare, and its specific risk factors are not completely established. Some factors associated with pancreatic cancer in general may increase the likelihood of developing pancreatic malignancy.

Having one or more of these factors does not mean that a person will develop pancreatic acinar cell carcinoma.