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p16INK4 and p15INK4B alterations in primary gynecologic malignancy
Y F Wong1, T K Chung, T H Cheung
1Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Shatin, N.T.
Gynecologic Oncology
|May 1, 1997
Summary
Alterations in chromosome 9 genes, p16INK4 and p15INK4B, are linked to gynecologic cancers. Homozygous deletions of these tumor suppressor genes were found in a subset of cervical, endometrial, ovarian, and vulvar tumors.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Chromosome 9 abnormalities are implicated in human gynecologic malignancies.
- The p16INK4 and p15INK4B genes on chromosome 9 band p21 are known tumor suppressors, but their in vivo role varies by tumor type.
Purpose of the Study:
- To investigate the presence and potential role of p16INK4 and p15INK4B gene deletions in primary gynecologic cancers.
Main Methods:
- Polymerase chain reaction (PCR)-based analysis was employed.
- The study analyzed 202 primary gynecologic tumors, including cervical, endometrial, ovarian, and vulvar carcinomas.
- Specific focus on homozygous deletions and mutations in p16INK4 and p15INK4B genes.
Main Results:
- Homozygous deletions of p16INK4 were detected in 5% of cervical, 2% of endometrial, 7% of ovarian, and 50% of vulvar carcinomas.
- Homozygous deletions of p15INK4B were found in 15% of cervical, 2% of endometrial, 33% of ovarian, and 50% of vulvar carcinomas.
- No mutations in p16INK4 exon 2 were observed in cases without deletions. Advanced stage vulvar cancers showed deletions in both genes, while early-stage cervical and ovarian cancers showed p16INK4 deletions.
Conclusions:
- Homozygous deletions of p16INK4 and/or p15INK4B genes are present in a subset of primary gynecologic malignancies.
- These genetic alterations may contribute to the development or progression of certain gynecologic cancers.
- The findings suggest a potential tumor suppressor role for these genes in specific gynecologic cancer types.