The treatment of rectal cancer has evolved significantly in recent years, with the emergence of new techniques that aim to increase the chances of recovery and minimize complications, while maintaining the patient’s quality of life. Treatment is no longer limited to traditional surgery, but includes a range of advanced methods, such as laparoscopic surgery, robotic surgery, transanal transrectal resection (TaTME), and modern radiation and chemotherapy.
These modern methods help to remove the tumor with high precision, reduce pain, shorten the recovery period, and preserve normal rectal function as much as possible. In Turkey, these techniques are available in specialized centers under the supervision of highly experienced surgeons, making it a preferred destination for patients seeking advanced and safe treatment.
What is rectal cancer?
Rectal cancer is a type of cancer that develops in the cells lining the rectum, the last part of the large intestine that connects the colon to the anus. The disease usually begins as polyps, which can turn into cancerous tumors if not detected and treated early.
Rectal cancer differs from colon cancer in terms of location and treatment method, as in many cases it requires delicate surgical techniques due to its proximity to the sphincter and the nerves responsible for controlling the excetory process. Therefore, rectal cancer treatment depends on the stage of the disease and the location of the tumor, and may include surgery, radiation therapy, chemotherapy, or a combination of them.
The difference between rectal cancer and colon cancer
Although colorectal cancer is classified as a colorectal tumor, there are important differences that affect diagnosis and treatment options:
| Comparison aspect | Colon cancer | Rectal cancer |
|---|---|---|
| Location | The upper parts of the large intestine | The last part of the large intestine near the anus |
| Proximity to the sphincter | Relatively far away | Very close, making surgery more challenging |
| Treatment methods | Often only surgery | Microsurgery, radiation therapy, and chemotherapy, depending on the stage |
| Difficulty of surgery | less | Higher due to the tightness of the pelvis and the need to maintain the sphincter |
| Maintaining the excetory function | Easier | Needs modern techniques to preserve the sphincter, such as TaTME or robotics |
This comparison helps patients understand why treatment options are different and the importance of modern techniques to safely and effectively treat rectal cancer.
People at high risk for rectal cancer
- People over the age of 50
- Those with polyps in the colon or rectum
- Those with a family history of colorectal cancer
- People with chronic inflammatory bowel disease (such as ulcerative colitis)
- People who eat a diet high in processed meats and low in fiber
- Physical inactivity and obesity
- Smokers
Stages of rectal cancer
The website explains that the stage of cancer is determined according to the TNM system, which takes into account the size of the tumor, the spread of the cancer to the lymph nodes, and its spread to distant parts of the body. The main stages are:
- Stage 0 (Carcinoma in situ): The abnormal cells are present only in the inner layer of the rectal wall and do not extend outward. It’s sometimes called carcinoma in situ (indolent).
- Stage I: The cancer has spread from the inner layer to neighboring tissues (such as the submucosa or muscles of the rectal wall) but has not spread to lymph nodes or distant organs.
- Phase II includes three subsets
- IIA: The cancer has spread through the muscle to the outer layer of the rectal wall (serosa).
- IIB: The cancer has spread through the outer layer but has not reached nearby organs.
- IIC: The cancer has spread to organs near the rectum.
- Phase III includes three subsets
- The cancer has spread to one or more nearby lymph nodes and may have extended into the rectal wall to a greater depth.
- It is divided into IIIA, IIIB, and IIIC depending on the number of lymph nodes and the extent of the tumor.
- Stage IV metastatic cancer: The cancer has spread to distant parts of the body, such as the liver, lungs, or distant lymph nodes. It is also divided into IV A, IV B, and IV C depending on the number of sites the cancer has spread to.
- Recurring cancer: Cancer may return after treatment in the same location or in another part of the body, which requires a new treatment evaluation.
Symptoms of rectal cancer
Depending on the stage of the disease and the location of the tumor, rectal cancer symptoms may be mild or inconspicuous in the early stages, making early detection critical.
Early symptoms
- Bleeding from the anus or blood in the stool
- Change in bowel pattern (persistent diarrhea or constipation)
- The sensation of not fully emptying the rectum
- Thin or misshapen stools
Late symptoms
- Pain or pressure in the pelvic or rectal area
- Chronic bleeding anemia
- General fatigue and persistent weakness
- Unexplained weight loss
Diagnosis of rectal cancer
Early diagnosis of rectal cancer is critical to maximize the chances of successful treatment and preserve the patient’s quality of life. Diagnosis is based on a combination of clinical tests and accurate medical images to determine the stage and location of the tumor. The diagnosis is based on the following:
- Clinical Tests
- Digital rectal examination: Allows the doctor to detect any abnormal tumors or growths in the rectum.
- Medical history and general clinical examination: to assess symptoms and risks associated with rectal cancer.
- Radiographic examination:
- Magnetic resonance imaging (MRI): To determine how far the tumor has spread into the rectal wall and surrounding tissues.
- CT Scan: To evaluate whether the cancer has spread to other organs, such as the liver or lungs.
- Transrectal ultrasound: To estimate the depth of tumor spread to the rectal wall and nearby lymph nodes.
- Lab Tests
- Biopsy: Taking a sample of the tumor for microscopic analysis and confirmation of the diagnosis.
- Blood tests, such as tumor marker testing, to support disease assessment.
- Determine the stage of the disease: Categorizing the cancer by stage helps the doctor choose the most appropriate treatment, whether it is traditional surgery, modern laparoscopic or robotic surgery, or a combination of radiation and chemotherapy.
Rectal cancer treatment by stage
The treatment of rectal cancer depends primarily on the stage of the disease, the extent of the tumor, and its location within the rectum, with the primary goal of removing the cancer completely while preserving excretory function and the patient’s quality of life as much as possible.
Rectal cancer treatment (Stage 0)
At this stage, the cancer is confined to the inner layer of the rectal lining only. Treatment is often done through minimally invasive surgery. The tumor can be completely removed without the need for additional treatment such as chemotherapy or radiation, and cure rates at this stage are very high.
Rectal cancer treatment (Stage I)
In the treatment of stage I rectal cancer, the tumor has penetrated the rectal wall but is still localized and has not spread to surrounding tissues or lymph nodes. At this stage, surgery is the primary treatment, and surgeons are careful as much as possible to avoid extensive abdominal surgery, especially when the tumor is low, by relying on modern minimally invasive surgical techniques.
In many cases, small and early tumors in the lower part of the rectum can be removed through transanal local excision, a technique that allows the tumor to be removed directly through the anus without the need for abdominal incisions. Larger or more highly localized tumors within the rectum can be treated with transanal laparoscopic surgery, which uses special instruments and an endoscope to provide a more precise view and enable safe removal of the tumor.
If the tumor cannot be removed through the rectum, more invasive surgeries may be necessary depending on the location of the tumor within the rectum. For tumors in the upper part of the rectum, an anterior resection is used, in which the affected portion of the rectum is removed and the colon is reconnected to the remaining portion. For tumors in the middle or lower rectum, a low anterior resection is performed, with the colon connected directly to the anus to preserve as much excretory function as possible.
In cases where the tumor is very low and close to the sphincter, abdominoperineal resection (APR) may be required, which requires removal of the rectum and anus with the need for a permanent cyst. In all of these options, each case is evaluated individually, with the highest priority given to preserving the sphincter and avoiding a permanent cyst whenever possible, without compromising the effectiveness of treatment or the chances of recovery.
Rectal Cancer Treatment (Stage II & III)
The treatment of stage II and III rectal cancer relies on combined therapy as the most effective approach to achieve disease control and minimize the risk of recurrence. In stage II, the tumor has invaded the rectal wall without affecting the lymph nodes, while stage III is characterized by the spread of cancer cells to nearby lymph nodes, necessitating an integrated treatment plan.
Treatment often begins with radiation therapy combined with chemotherapy before surgery to shrink the tumor and make it easier to remove, as well as increase the chances of sphincter preservation and reduce the need for a permanent bag. Radiation therapy is given either in small daily doses for five to six weeks, or in intense doses over a short period of five days, and the most appropriate plan is chosen based on the location of the tumor, its proximity to the anus, and the patient’s general condition.
Modern radiation techniques include precisely targeted external beam radiation such as IMRT and IGRT, brachytherapy, as well as intraoperative radiation therapy (IORT) in complex cases or when the tumor returns. After completing the preparatory treatment, a precise modern surgery is performed using one of the advanced techniques such as laparoscopic surgery, robotic surgery, or transanal surgical techniques, depending on the location and anatomy of the tumor. Transanal total mesorectal excision (TaTME) is one of the most prominent of these modern techniques, mainly used in stages II and III, especially for low tumors close to the sphincter.
This surgery is performed through the rectum without the need for large abdominal incisions, which provides a precise view of the tumor and allows for a complete resection of the mesenteric membrane of the rectum while preserving the nerves and sphincter as much as possible, which contributes to better functional outcomes after surgery and reduces the need for a permanent bag. After surgery, treatment is complemented by five to six months of adjuvant chemotherapy to eliminate any remaining cancer cells and reduce the risk of long-term recurrence.
Treatment for Stage IV rectal cancer
In Stage IV rectal cancer treatment, the disease has spread beyond the rectum to distant organs such as the liver or lungs, making the treatment plan more complex and focused on controlling the spread of the cancer and improving the patient’s quality of life. At this stage, chemotherapy is the first line of treatment, aimed at shrinking the size of the tumors and limiting the spread of cancer cells in the body.
Chemotherapy protocols include well-known drugs such as Fluorouracil (5-FU), Oxaliplatin, Capecitabine, and Irinotecan, often combined with targeted therapies such as Bevacizumab or Cetuximab, depending on the molecular characteristics of the tumor and the patient’s condition. This integrated treatment approach helps improve response to treatment and prolong disease control.
In selected cases, surgery or radiation therapy to remove the primary tumor in the rectum or certain metastases, especially when the disease is limited and resectable, may be used to improve symptoms or prolong survival. In cases where surgery is not possible, treatment focuses on relieving symptoms and improving quality of life by controlling pain, bleeding, or bowel obstruction, with close and continuous medical follow-up.
Stoma (pouch) after rectal cancer treatment
- Temporary stoma: Used to allow the bowel to heal after surgery. An ileostomy is often used.
- Permanent stoma: A colostomy is often used in this case. It is necessary if the anus and sphincter are removed.
The type of stoma (temporary or permanent) is determined by the type of surgery and the location of the tumor.
Rectal cancer treatment in Turkey, cure rates, and quality of life after treatment
Turkey has become one of the leading destinations for rectal cancer treatment thanks to the availability of all modern medical technologies in advanced centers specialized in gastrointestinal surgery and oncology. These centers rely on the latest treatment methods, including laparoscopic surgery, robotic surgery, transanal surgical techniques, as well as advanced radiation and chemotherapy, and the treatment plan for each patient is individually selected according to the stage of the disease and the location of the tumor.
Surgeons’ expertise plays a pivotal role in the success of treatment, as surgical precision and selection of the appropriate technique contribute to achieving high cure rates and minimizing complications, especially in tumors that are low or close to the sphincter muscle. Studies have shown that the use of modern techniques has a direct impact on long-term outcomes, helping to reduce the risk of local recurrence and preserve vital functions of the rectum.
Life after modern rectal cancer treatment is significantly improved compared to traditional surgery, as the rapid recovery and gradual return of normal rectal function allows the patient to better resume their daily lifestyle. Long-term follow-up is an essential part of the treatment plan, which includes regular check-ups to monitor recovery and early detection of any possible recurrence of the disease, thus enhancing the chances of continuing to live a healthy and safe life.
Finally, with advances in the treatment of rectal cancer, a diagnosis no longer means a loss of quality of life or reliance on traditional surgery. Modern technologies, coupled with advanced medical expertise, have allowed for precise treatment options that achieve high cure rates, minimize complications and relapse, and preserve as much as possible the normal function of the rectum.
In Turkey, the availability of these technologies, combined with the expertise of specialized surgeons in advanced centers, gives patients a real opportunity to receive effective and safe treatment based on a careful individual assessment of each case. Making the right treatment decision, at the right time, is an essential step towards recovery and a return to a normal, stable life.
Sources:
- National Cancer Institute. (2025, May 16). Rectal cancer treatment (PDQ®)-Patient version. U.S. Department of Health and Human Service
- Johns Hopkins Medicine. (n.d.). Rectal cancer treatment. Johns Hopkins Medicine
- Cancer Research UK. (2025, January 17). Treatment for bowel (rectal) cancer
- American Cancer Society. (2024, February 5). Rectal cancer treatment, by stage
