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DNA mapping of gastric cancers using flow cytometric analysis
1Division of Pathology, Central Clinical Laboratory, Iwate Medical University, Morioka, Japan. tsugai@cocoa.ocn.ne.jp
Cytometry
|October 12, 2000
Summary
This study reveals distinct DNA ploidy patterns in gastric cancer progression. Intestinal-type cancers show early aneuploidy, while diffuse-type cancers develop it later, impacting invasion differently.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- DNA ploidy analysis is crucial for understanding cancer progression.
- Previous studies have not fully elucidated the role of aneuploidy (DNA index, DI) differences during gastric cancer progression.
Purpose of the Study:
- To chart differences in DNA indices (DI) during gastric cancer progression.
- To clarify the role of aneuploidy in the invasion of intestinal and diffuse-type gastric cancers.
Main Methods:
- Analyzed 136 gastric cancers (intestinal and diffuse types) using flow cytometry with multiple sampling.
- Classified cancers into intramucosal, submucosal, and advanced stages.
- Examined DNA ploidy patterns in mucosal and submucosal lesions of individual cancers.
Main Results:
- Intratumoral DNA ploidy differences were observed in both gastric cancer types.
- Intestinal-type cancers showed multiple subclones with different DIs early on; diffuse-type cancers showed this mainly in advanced stages.
- Early intestinal-type cancers had a wide DI range (1.0-2.0), while early diffuse-type cancers had a DI < 1.2. Advanced cancers showed similar DI distributions for both types.
- High DI aneuploidy (>1.3) was frequent in mucosal lesions of intestinal-type cancers, while only low DI (<1.2) aneuploid clones were found in diffuse-type mucosal lesions.
Conclusions:
- High DI aneuploid clones in intramucosal intestinal-type cancers gain invasive ability during progression.
- DNA aneuploidy plays a significant role in submucosal invasion of diffuse-type gastric cancers.