Histologic types of colon cancer include the following:Adenocarcinoma (most colon cancers).Mucinous (colloid) adenocarcinoma.Signet ring adenocarcinoma.Scirrhous tumors.Neuroendocrine. Tumors with neuroendocrine differentiation typically have a poorer prognosis than pure adenocarcinoma variants.References: Saclarides TJ, Szeluga D, Staren ED: Neuroendocrine cancers of the colon and rectum. Results of a ten-year experience. Dis Colon Rectum 37 (7): 635-42, 1994.
There are different types of treatment for patients with colon cancer. Different types of treatment are available for patients with colon cancer. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment. Six types of standard treatment are used:SurgerySurgery (removing the cancer in an operation) is the most common treatment for all stages of colon cancer. A doctor may remove the cancer using one of the following types of surgery:Local excision: If the cancer is found at a very early stage, the doctor may
Stage I tumors extend beneath the mucosa into the submucosa (T1) or into, but not through, the bowel muscle wall (T2). Because of its localized nature at presentation, stage I has a high cure rate. Treatment options:Wide surgical resection and anastomosis when an adequate low-anterior resection (LAR) can be performed with sufficient distal rectum to allow a conventional anastomosis or coloanal anastomosis.Wide surgical resection with abdominoperineal resection (APR) for lesions too distal to permit LAR.Local transanal or other resection [1,2] with or without perioperative external-beam radiation therapy (EBRT) plus fluorouracil (5-FU).There are three potential options for surgical resection in stage I rectal cancer: local excision, LAR, and APR. Local excision should be restricted to tumors confined to the rectal wall and that do not, on rectal ultrasound or magnetic resonance imaging, involve the full thickness of the rectum (i.e., not a T3 tumor). The ideal candidate for local
Tests are used to screen for different types of cancer.Some screening tests are used because they have been shown to be helpful both in finding cancers early and decreasing the chance of dying from these cancers. Other tests are used because they have been shown to find cancer in some people; however, it has not been proven in clinical trials that use of these tests will decrease the risk of dying from cancer. Scientists study screening tests to find those with the fewest risks and most benefits. Cancer screening trials also are meant to show whether early detection (finding cancer before it causes symptoms) decreases a person's chance of dying from the disease. For some types of cancer, finding and treating the disease at an early stage may result in a better chance of recovery. Clinical trials that study cancer screening methods are taking place in many parts of the country. Information about ongoing clinical trials is available from the NCI Web site.Studies show that screening for
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.Editorial changes were made to this summary.This summary is written and maintained by the PDQ Screening and Prevention Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ NCI's Comprehensive Cancer Database pages.
Stage 0 colon cancer is the most superficial of all the lesions and is limited to the mucosa without invasion of the lamina propria. Because of its superficial nature, the surgical procedure may be limited.Standard Treatment Options for Stage 0 Colon CancerSurgeryStandard treatment options for stage 0 colon cancer include the following:Local excision or simple polypectomy with clear margins.Colon resection for larger lesions not amenable to local excision.Current Clinical TrialsCheck for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage 0 colon cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.General information about clinical trials is also available from the NCI Web site.
Stage IV colon cancer denotes distant metastatic disease. Treatment of recurrent colon cancer depends on the sites of recurrent disease demonstrable by physical examination and/or radiographic studies. In addition to standard radiographic procedures, radioimmunoscintography may add clinical information that may affect management. Such approaches have not led to improvements in long-term outcome measures such as survival.Treatment Options for Stage IV and Recurrent Colon CancerTreatment options for stage IV and recurrent colon cancer include the following:Surgical resection of locally recurrent cancer.Surgical resection and anastomosis or bypass of obstructing or bleeding primary lesions in selected metastatic cases.Resection of liver metastases in selected metastatic patients (5-year cure rate for resection of solitary or combination metastases exceeds 20%) or ablation in selected
There are different types of treatment for patients with rectal cancer.Different types of treatment are available for patients with rectal cancer. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.Four types of standard treatment are used:SurgerySurgery is the most common treatment for all stages of rectal cancer. The cancer is removed using one of the following types of surgery:Polypectomy: If the cancer is found in a polyp (a small piece of bulging tissue), the polyp is often removed during a