[Lymph Node Dissection and Postoperative Follow-Up for T2 Cancer of the Lower Rectum]

Area of Science:

• Oncology
• Surgical Oncology
• Gastrointestinal Surgery

Context:

• This study compares outcomes for lower rectal cancer patients based on tumor stage.
• It analyzes data from 88 patients with T2 stage cancer versus 340 with T3/T4a and 51 with T1 stages.

Purpose:

• To evaluate and compare lymph node metastasis, recurrence rates, and survival outcomes for lower rectal T2 cancer.
• To determine appropriate lymph node dissection strategies and identify risk factors for recurrence in T2 rectal cancer.

Summary:

• Lower rectal T2 cancer demonstrated significantly lower rates of lymph node metastasis compared to T3/T4a, and similar rates to T1.
• Recurrence rates for T2 cancer were not significantly different from T1, though 50% of recurrences occurred after 30 months.
• Five-year survival rates for T2 cancer were significantly higher than T3/T4a and comparable to T1.

Impact:

• Findings suggest that lymph node dissection for lower rectal T2 cancer can be similar to that for T1 cancer.
• Elevated preoperative serum CA19-9 levels are identified as a risk factor for recurrence in T2 rectal cancer.
• The study highlights the importance of extended postoperative follow-up (beyond 30 months) for T2 rectal cancer patients to monitor for late recurrences.