Minute gastric cancers less than 5 mm in diameter

Area of Science:

• Gastroenterology
• Oncology
• Pathology

Background:

• Minute gastric cancers, defined as those with maximum dimensions less than 5 mm, represent an early stage of gastric malignancy.
• Understanding the clinicopathological characteristics of these small tumors is essential for effective early detection and treatment strategies.
• Previous research has focused on larger lesions, leaving a gap in knowledge regarding the behavior of very early-stage gastric cancers.

Purpose of the Study:

• To investigate the clinicopathological features of minute gastric cancers (≤5 mm).
• To determine the association between macroscopic type, multiplicity, and submucosal invasion in these early-stage cancers.
• To identify key indicators for detecting gastric cancers before they invade beyond the submucosal layer.

Main Methods:

• Clinicopathological analysis of 55 minute gastric cancers (49 intramucosal, 9 submucosal) from 55 patients.
• Macroscopic classification based on shape (elevated, flat, depressed).
• Categorization into single or multiple cancer groups to assess invasion depth and type.

Main Results:

• No lymph node metastasis was observed in any of the minute gastric cancers studied.
• Depressed-type cancers were predominant, particularly among submucosal lesions (88.9%).
• Single, depressed-type minute gastric cancers showed a significantly higher incidence of submucosal invasion (36.4%) compared to multiple cancers (2.9%).

Conclusions:

• Minute gastric cancers (≤5 mm) generally have a favorable prognosis with no lymph node metastasis.
• The depressed macroscopic type is a significant indicator of potential submucosal invasion, especially in single lesions.
• Early detection of gastric cancers at approximately 5 mm, particularly those that are single and depressed, is vital to prevent deeper invasion.