[Decrease of the number of involved lymph nodes after preoperative chemoradiotherapy in rectal carcinoma]

Area of Science:

• Oncology
• Surgical Oncology
• Radiation Oncology

Background:

• Colon cancer treatment involves surgery, chemotherapy, and radiotherapy.
• Optimizing neoadjuvant chemoradiotherapy is crucial for improving patient outcomes.
• Assessing the impact of treatment on lymph node metastasis is vital for prognosis.

Purpose of the Study:

• To evaluate the efficacy of prolonged chemoradiotherapy in reducing mesorectal lymph node metastases in colon cancer.
• To identify prognostic factors influencing treatment outcomes in colon cancer patients.

Main Methods:

• Retrospective analysis of 296 colon cancer patients treated between 2004 and 2011.
• Comparison of a main group (chemoradiotherapy, surgery, adjuvant chemotherapy) with a control group (surgery, adjuvant chemotherapy).
• Assessment of lymph node metastasis, tumor penetration, and treatment timing.

Main Results:

• Prolonged chemoradiotherapy led to a statistically significant decrease in regional lymph node metastases.
• The reduction in metastases was most pronounced in patients with N1 stage disease (1-3 lymph nodes).
• Tumor penetration depth and chemoradiotherapy-to-surgery interval influenced lymph node involvement.

Conclusions:

• Prolonged chemoradiotherapy is effective in reducing lymph node metastases in colon cancer.
• The number of involved lymph nodes is a more critical prognostic indicator than their metastatic status.
• Treatment strategies should consider tumor characteristics and timing for optimal results.