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Metastatic 'early' colorectal cancer
The Australian and New Zealand Journal of Surgery
|December 1, 1984
Summary
Early colorectal cancer survival is significantly impacted by lymph node metastasis, especially in rectal cases. Resection is advised for colon cancers, while local excision may be expanded for rectal cancers with careful follow-up.
Area of Science:
- Oncology
- Gastroenterology
- Surgical Oncology
Background:
- Early colorectal cancer is defined as tumors confined to the wall.
- Lymph node metastasis rates are 21% for wall-confined and 13% for submucosa-confined tumors.
- There is renewed interest in local treatment for early rectal tumors and endoscopic removal of invasive polyps.
Purpose of the Study:
- To analyze long-term cancer survival data for early colorectal cancers.
- To assess the impact of lymph node metastasis on survival in early rectal and colon cancers.
- To inform treatment guidelines for early colorectal cancers based on lymph node involvement.
Main Methods:
- Analysis of a combined surgical series spanning over 30 years.
- Comparison of long-term survival rates between patients with and without lymph node metastasis.
- Statistical analysis to determine the significance of nodal involvement on survival (P=0.001 for rectal, P<0.05 for colon).
Main Results:
- Regional lymph node metastasis significantly reduced long-term survival in early rectal cancer (56% vs. 79% without nodes).
- Long-term survival in early colon cancer was less affected by lymph node metastasis (73% vs. 77% without nodes).
- The presence of lymph node metastasis was strongly associated with poorer outcomes in rectal cancer.
Conclusions:
- Resection is recommended for all invasive colon cancers in good-risk patients due to potential lymph node spread.
- Indications for local excision of early rectal cancers can be broadened, considering follow-up and salvage options.
- Further research is needed to fully understand lymph node spread risks from early tumors.