Appendix Cancer

Appendix Cancer

Your appendix is a narrow, tube-shaped pouch connected to the colon near the beginning of the large intestine. The purpose of the appendix is still not fully understood, but some scientists believe it may be part of the immune system.

Appendix cancer is sometimes called appendiceal cancer. It occurs when healthy cells become abnormal and begin to grow rapidly. These cancerous cells form a lump or tumor inside the appendix, which is often discovered accidentally during surgery to remove the appendix.

Appendix cancer is considered a rare disease. According to the U.S. National Cancer Institute, about one or two people per million are diagnosed with this cancer each year in the United States.

In this article, we will discuss the different types and classifications of appendix cancer, as well as its symptoms, risk factors, and treatment methods.

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Types of Appendix Cancer

There are several classifications of appendix cancer, but they are not very clearly defined because the disease is extremely rare and research is limited.

1. Neuroendocrine Carcinoma
This type of tumor is sometimes called a typical carcinoid. It develops from specific cells in the intestinal wall.
It accounts for about half of appendix cancers. It can spread (metastasize) but can often be successfully treated with surgery.

2. Mucinous Adenocarcinoma
Mucinous adenocarcinoma of the appendix (MAA) occurs equally in men and women, usually around age 60. No specific risk factors are known.
The cancer cells produce a jelly-like substance called mucin, which can spread cancer to other parts of the body.
MAA is often diagnosed when the tumor ruptures and releases mucin.

3. Colonic-Type Adenocarcinoma
This cancer type accounts for about 10% of appendix cancers and behaves like colorectal cancer.
It usually occurs between ages 62 and 65 and is more common in men. It generally starts at the base of the appendix.

4. Goblet Cell Adenocarcinoma
Also called goblet cell carcinoma (GCC), this develops from neuroendocrine cells and goblet epithelial cells, which also produce mucin.
It usually occurs between ages 50 and 55 and often causes appendicitis or abdominal pain and masses.

5. Signet Ring Cell Adenocarcinoma
This is a subtype of colonic-type or mucinous adenocarcinoma. It is the most aggressive type of appendix cancer, with the highest likelihood of spreading to other organs, though it is extremely rare.
While more often found in the colon or stomach, it can also develop in the appendix.

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Symptoms of Appendix Cancer

More than half of patients with appendix cancer experience no symptoms. It is often discovered incidentally during surgery or imaging for another problem, such as appendicitis.
It can also be found during a routine colonoscopy.
If symptoms occur, they may include:

• Abdominal swelling or bloating

• Unusual mass in the ovary

• Persistent or severe abdominal pain

• Vague discomfort in the lower right abdomen

• Changes in bowel habits (constipation, blockage, diarrhea)

• Hernia

• Diarrhea

These symptoms are more common in advanced stages. In about one-third of cases, the cancer has already spread to distant parts of the body by the time it is diagnosed.

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Stages and Grades of Appendix Cancer

Doctors often use the TNM staging system:

• T (Tumor) – Size and location in the appendix

• N (Node) – Whether it has spread to lymph nodes

• M (Metastasis) – Whether it has spread to other parts of the body

Tumor (T) ranges from T0 (no cancer) to T4b (spread to other organs).
Node (N) ranges from N0 (no lymph node involvement) to N2 (spread to 4+ lymph nodes).
Metastasis (M) ranges from M0 (no spread) to M1c (spread beyond the peritoneum).

Grade (G) indicates how abnormal the cancer cells look under a microscope:

• G1: Similar to healthy cells

• G4: Very abnormal and aggressive

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Risk Factors

The exact cause is unknown, and no avoidable risk factors have been identified.
It is more common with increasing age and extremely rare in children.
Neuroendocrine tumors are more common in women.
Possible risk factors include:

• Pernicious anemia (vitamin B12 deficiency)

• Atrophic gastritis (chronic stomach inflammation)

• Zollinger–Ellison syndrome (rare digestive disorder)

• Family history of MEN1 (Multiple Endocrine Neoplasia Type 1)

• Smoking

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Treatment Options

Treatment depends on:

• Tumor type

• Stage of cancer

• Patient’s overall health

It is usually managed by a multidisciplinary team including surgeons, oncologists, nurses, dietitians, and counselors.

Surgery is the most common treatment for localized cases:

• Appendectomy – removal of the appendix

• Hemicolectomy – removal of part of the colon and lymph nodes if the tumor is large or aggressive

• Cytoreductive surgery / debulking – for widespread cancer in the abdomen

Chemotherapy may be given before or after surgery, especially if:

• The tumor is larger than 2 cm

• It has spread to lymph nodes

• It is aggressive

Types include:

• Systemic chemotherapy (through the whole body)

• Regional chemotherapy – directly into the abdomen, such as EPIC or HIPEC

Radiation therapy is rarely used but may be considered if cancer spreads outside the abdomen.

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Recurrence and Survival

Data is limited due to rarity. According to the American Society of Clinical Oncology:

• Grade 1–2 neuroendocrine tumors: 5-year survival is 67–97%

• Advanced disease: much lower survival rates

• Signet ring cell tumors: lowest survival rate, about 27%

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Summary

Early-stage appendix cancer generally has a good prognosis.
It is often discovered incidentally during surgery for another reason.
Regular follow-up is important to detect recurrence.