Recurrent Rectal Cancer

Recurrent rectal cancer occurs when cancer returns after initial treatment, affecting 6 to 12 percent of patients who previously underwent surgery with or without chemotherapy and radiation therapy. Understanding this complex condition and its management options is essential for patients facing this challenge.

Table of contents

• What Is Recurrent Rectal Cancer?
• How Does Rectal Cancer Recur?
• Who Needs Follow-Up Testing?
• Risk Factors for Recurrence
• Follow-Up Testing and Monitoring
• Treatment Approaches
• The Importance of Specialized Expertise

What Is Recurrent Rectal Cancer?

Recurrent rectal cancer means that cancer has come back after initial treatment. This can happen even when treatment successfully removed or destroyed the original cancer.^[1] The recurrence represents a complex and varied disease that deeply affects a patient’s quality of life and long-term survival.^[6]

Locally recurrent rectal cancer (LRRC) occurs in approximately 6 to 12 percent of patients who were previously treated with surgery, with or without pre-operative chemoradiation therapy (a combination of chemotherapy and radiation treatment).^[6] Its management typically requires a team of different medical specialists working together to evaluate all aspects of the disease, such as whether the cancer can be surgically removed or what approaches might best reduce symptoms.^[6]

How Does Rectal Cancer Recur?

There are two main ways that rectal cancer can come back after treatment. Understanding these patterns helps doctors plan appropriate monitoring and treatment strategies.^[4]

Local recurrence refers to tumors returning in the same area as the original tumor. This means the cancer grows back near where it was first found in the rectum or nearby tissues.^[4]

Distant recurrence, also called metastatic disease, means cells from the original cancer have spread to distant organs. The liver and lungs are the most common places where rectal cancer spreads.^[4]

Additionally, new colorectal cancers can develop at different sites in the colon and rectum, separate from the location of the original tumor. This is not truly a recurrence but rather a new cancer that develops sometime after treatment of the first cancer.^[4]

The most likely reason for recurrence is that cancer was not completely removed during initial surgery, even with chemotherapy.^[15] Sometimes, microscopic cancer cells are either left behind in the bowel or spread to other body parts before treatment, allowing the cancer to return. In other cases, patients may develop cancer again later because they still have some of the risk factors that contributed to their original cancer.^[13]

Who Needs Follow-Up Testing?

Once a patient has been diagnosed and treated for rectal cancer, continued follow-up is essential. Patients with a history of colorectal cancer face a significantly increased risk compared to those with no cancer history—not only for cancer recurrence, but also for developing new polyps (abnormal growths that can develop into cancer).^[4]

Any patient who had surgery to remove a polyp or colorectal cancer has approximately double the risk of developing new polyps. These patients should have their first colonoscopy one year after surgery, a follow-up colonoscopy three years later, and then colonoscopies at intervals of no less than five years. If any new polyps or abnormal areas are found, the monitoring schedule should be adjusted as needed.^[4]

The risk of recurrence can often be determined by the stage (extent) of the original cancer. Stage I cancers have the lowest risk of recurrence, while stage II and III cancers have a higher risk. Stage II cancers are those where the tumor grew deeper through the wall of the colon or rectum or invaded nearby organs removed during surgery, but did not spread to lymph nodes (small bean-shaped structures that help fight infection). Stage III cancers are those that have spread to the lymph nodes. Stage IV tumors have spread to distant organs such as the liver, lungs, or brain.^[4]

Risk Factors for Recurrence

Several factors can increase the likelihood that rectal cancer will return after treatment. Part of what makes rectal cancer different from colon cancer is that local recurrence rates tend to be higher. If rectal cancer does recur, treatment is more likely to require a permanent colostomy (a surgical opening in the abdomen for waste elimination).^[3]

Getting treated properly during the first round of treatment is crucial for avoiding recurrence. A patient’s best chance of completely eliminating rectal cancer is during the initial treatment approach. This is another important reason why having a highly skilled colorectal surgeon and a team of specialists from different medical fields is essential to achieving a positive result the first time.^[3]

Surgical technique plays an important role in outcomes, particularly when treating colorectal cancers. Studies have shown that both the surgeon’s skill and the hospital’s experience with these procedures are associated with better patient outcomes. Patients are more likely to have positive results and better quality of life when their surgeon and hospital perform higher numbers of these procedures.^[3]

Follow-Up Testing and Monitoring

Proper follow-up testing is key to detecting recurrence early and managing it as successfully as possible. These tests are designed to find recurrences before symptoms develop, so that treatment can be most effective.^[4]

The main categories of follow-up testing include routine medical history and physical examination, blood tests, colonoscopy, and imaging studies using specialized equipment.^[4]

A medical history and physical examination are the most basic parts of post-treatment follow-up. However, they are often the least effective way to detect early recurrences because the vast majority of recurrences do not cause noticeable signs or symptoms initially.^[4]

Blood tests may include checking CEA (carcinoembryonic antigen), a substance that can be measured in the blood. If CEA levels were high before treatment and then decreased to normal after treatment, rising levels may suggest recurrence and prompt additional testing.^[14] For rectal cancer patients, blood tests might be conducted every three to six months for several years after treatment.^[4]

Colonoscopy is typically performed one year after surgery, then every three to five years if results are normal. For rectal cancer patients who had certain types of surgery through the anus, a different examination called proctoscopy may be recommended every three to six months for the first two years.^[14]

Imaging tests such as CT scans (computed tomography, which creates detailed images of the inside of the body) may be performed every six to twelve months for patients at higher risk of recurrence.^[4]

Treatment Approaches

The management of locally recurrent rectal cancer usually requires an approach involving specialists from multiple medical disciplines. They work together to evaluate whether the cancer can be surgically removed and determine the best ways to manage symptoms.^[6]

Surgical treatment offers the best chance of long-term survival for patients whose recurrent cancer is confined to the pelvis and can be technically removed.^[12] However, achieving a complete removal of the cancer with clear margins (edges free of cancer cells) is critical to improving survival after surgery.^[6]

Surgery for recurrent disease is more complex and usually requires specialized centers with extensive experience. The procedures may involve aggressive removal of soft tissue, bone, and blood vessels, followed by reconstruction.^[6]

Radiation therapy and chemotherapy play important roles in treating recurrent rectal cancer. Depending on the location of the tumor and how far it has spread, radiation and chemotherapy may be given before surgery to shrink the tumor. This combined approach, where chemotherapy is given at the same time as radiation to make the radiation more effective, has become a standard treatment method.^[3]

This pre-surgery approach helps make it more likely that surgeons can remove the tumor using techniques that preserve normal bowel function and avoid permanent colostomy. It also helps reduce the risk of the cancer returning again.^[3]

In some cases, radiation may also be given after surgery to treat any microscopic cancer cells that might have been left behind. There are several combinations of chemotherapy and radiation available, and doctors will determine the right treatment approach for each individual patient.^[3]

The Importance of Specialized Expertise

Medical studies have demonstrated that specialized expertise makes a significant difference in treatment outcomes, especially for colorectal cancers. Colorectal surgeons who are specially trained and certified, and who focus exclusively on diseases of the colon and rectum, possess skills in minimally invasive surgical techniques and procedures that can preserve normal bowel function.^[3]

These specialized techniques are more likely to avoid damage to nerves needed for normal urination and sexual function. Studies have also found that hospitals performing higher numbers of these procedures are associated with better patient outcomes—patients are more likely to have positive results and better quality of life.^[3]

It is rare for a permanent colostomy to be the only treatment option for rectal cancer. In the United States, more than half of all rectal cancer patients end up with a permanent colostomy, but this does not have to be the case. The outcome can be very different when patients receive treatment from highly trained colorectal surgeons using techniques designed to preserve normal bowel function.^[3]

Rectal cancer patients might not need a permanent colostomy, might not need traditional open surgery, or in some cases might not need surgery at all. Having the right expertise, tools, knowledge, skill, and experience can make a dramatic difference in outcome and quality of life.^[3]