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Cyclin D1 gene amplification in esophageal carcinosarcoma shown by differential polymerase chain reaction
H Suzuki1, J Moriya, A Nakahata
1The Second Department of Pathology, Hokkaido University School of Medicine, Hokkaido University Hospital, Sapporo, Japan.
Abstract:
We studied cyclin D1 gene amplification in four esophageal carcinosarcomas using the differential polymerase chain reaction. Three cases showed amplification in the sarcomatous components, and one of these also showed amplification in the carcinomatous component. No amplification was detected in the other case. We also examined p53 expression in these four tumors by immunostaining. Both components of all four cases showed diffuse overexpression of p53 protein in the nuclei. Our results showed that the cyclin D1 gene is frequently amplified in esophageal carcinosarcoma, especially in the sarcomatous component. Two cases showed amplification only in the sarcomatous component, suggesting that amplification may have a role in the pathogenesis of that component of this malignancy. The diffuse overexpression of p53 observed in both components suggests that such overexpression, which could be the result of somatic mutation, might be an early event in the pathogenesis of esophageal carcinosarcoma.
Insights
Cyclin D1 gene amplification is frequent in esophageal carcinosarcomas, particularly in sarcomatous components. Overexpressed p53 protein in both tumor types suggests it may be an early event in disease development.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Esophageal carcinosarcoma is a rare malignancy.
- The genetic alterations driving its development are not fully understood.
Purpose of the Study:
- To investigate cyclin D1 gene amplification in esophageal carcinosarcomas.
- To examine p53 protein expression in both carcinomatous and sarcomatous components.
Main Methods:
- Differential polymerase chain reaction (PCR) was used to detect cyclin D1 gene amplification.
- Immunohistochemistry was employed to assess p53 protein expression.
Main Results:
- Cyclin D1 gene amplification was observed in three out of four cases, predominantly in the sarcomatous component.
- Two cases showed amplification exclusively in the sarcomatous component.
- Diffuse nuclear overexpression of p53 protein was detected in both components of all four tumors.
Conclusions:
- Cyclin D1 gene amplification appears to be a frequent event in esophageal carcinosarcoma, potentially contributing to sarcomatous component development.
- Widespread p53 overexpression suggests its role as an early event in the pathogenesis of this cancer.
