When someone is diagnosed with appendix cancer, one of the first questions they may ask is: Where does appendix cancer spread to?

Appendix cancer is a rare disease, affecting less than 2000 people in the United States each year. Because it is uncommon, many patients and caregivers are unfamiliar with how it behaves and what happens when it advances. Understanding where appendix cancer can metastasize can help patients make sense of staging, treatment recommendations, and conversations with their doctor.

Appendix Cancer Most Commonly Spreads to the Peritoneum

The most common place for appendix cancer to spread is the peritoneum. That’s the thin membrane that lines the abdominal cavity and covers many of the organs. Cancer cells can break away from the appendix and attach to the peritoneal lining, where they may continue to grow and form tumors throughout the abdomen. This pattern of spread makes the peritoneum the most common site of metastasis for appendix cancer. 

Appendix Cancer Can Spread to Nearby Abdominal Organs

While the peritoneum is the most common site of spread, appendiceal cancer can also spread to other organs within the abdomen. As cancer cells move throughout the abdominal cavity, they may attach to nearby tissues and organs.

Appendiceal cancers have been found on the surfaces of the colon, rectum, pancreas, liver, small intestine, gallbladder, ovaries, and uterus, among other abdominal structures. Rather than spreading through the bloodstream, many appendix cancers spread locally throughout the abdomen, affecting multiple organs over time.

Appendix Cancer Can Spread to the Lymph Nodes

Appendix cancer can also spread to nearby lymph nodes, which are small glands that help filter harmful substances and support the body’s immune system. This type of spread is known as regional spread because the cancer has moved beyond the appendix but has not necessarily reached distant organs. The presence of cancer in the lymph nodes is an important factor in staging appendix cancer. Cancers that have spread to regional lymph nodes are considered more advanced than cancers confined to the appendix, but they are different from cancers that have spread to distant locations. 

Not all appendix cancers spread to the lymph nodes. Whether lymph node involvement occurs often depends on the type of appendiceal tumor and how far the disease has progressed. For this reason, doctors may examine nearby lymph nodes during surgery to determine whether the cancer has spread and to help guide treatment decisions.

Appendix Cancer Does Not Usually Spread to Distant Organs

One of the unique characteristics of appendix cancer is that it usually does not spread to distant organs. While many cancers can travel through the bloodstream to areas such as the lungs, brain, or bones, appendix cancer is more likely to remain localized or spread within the abdomen.

Appendix Cancer Support Services in Queens and New York City

A diagnosis of appendix cancer can feel overwhelming, especially when faced with questions about staging and disease progression. At SHAREing & CAREing, we provide free cancer support services for survivors, thrivers, caregivers, and families throughout Queens and New York City.

Whether you’re navigating a new diagnosis or supporting a loved one through treatment, you don’t have to face cancer alone. Explore our support groups, get help finding free and low-cost cancer treatment, or connect with a patient navigator to help you with insurance questions. 

Sources: 

• Appendiceal Cancer and Tumors, National Organization on Rare Diseases
• Appendix cancer, Mayo Clinic
• Appendix Cancer is NOT the Same as Colorectal Cancer and Here’s Why, Appendix Cancer PMP Research Foundation 
• Peritoneal Metastases from Appendiceal Cancer, Surgical Oncology Clinics, July 2018