Conditional Relative Survival Among Patients With Gastric Cancer Undergoing Surgery: A Hospital-Based Cohort Study.

Area of Science:

• Oncology
• Surgical Outcomes
• Biostatistics

Background:

• Conditional relative survival (CRS) is a key metric for assessing post-surgical prognosis.
• Gastric resection is a common treatment for gastric cancer, necessitating evaluation of long-term outcomes.
• Understanding survival trends post-gastric surgery is crucial for patient management and healthcare planning.

Purpose of the Study:

• To evaluate the 5-year conditional relative survival (CRS) up to 5 years after gastric resection.
• To assess survival probability in gastric cancer patients compared to the general population post-surgery.

Main Methods:

• Analysis of 15,601 gastric cancer patients undergoing gastric resection (1996-2018).
• Calculation of relative survival (RS) as the ratio of observed to expected survival.
• Determination of 5-year CRS based on survival milestones post-surgery.

Main Results:

• Five-year CRS increased from 87.2% at 1 year to 95.4% at 5 years post-surgery.
• Stage III cancer showed a substantial CRS improvement from 53.2% (1 year) to 85.2% (5 years).
• Patients aged 80+ had a high 5-year CRS (99.4%), and recent surgeries indicated better early outcomes. Total gastrectomy was associated with lower CRS than distal gastrectomy.

Conclusions:

• Conditional relative survival improves over time, confirming the safety of gastric resection, including for elderly individuals.
• Careful patient selection enhances surgical safety and outcomes.
• Total gastrectomy patients may require long-term nutritional support and specialized care.