|LETTER TO THE EDITOR
|Year : 2022 | Volume
| Issue : 3 | Page : 862-863
Both Kras gene mutation and Her2 gene mutation tend to exist in an inverse manner but not mutually exclusive in mucinous ovarian carcinoma: An analysis of 21 taiwanese women
Chiew-Loon Koo1, Ming-Yung Lee2, Wan-Ru Chao3, Chih-Ping Han4
1 Department of Pathology, Tungs' Taichung MetroHarbor Hospital, Taichung, Taiwan
2 Department of Statistics and Informatics Science, Providence University, Taichung, Taiwan
3 Department of Pathology, Chung-Shan Medical University, Chung Shan Medical University Hospital, Taichung, Taiwan
4 Department of Pathology, Chung-Shan Medical University, Chung Shan Medical University Hospital; Department of Obstetrics and Gynecology, Chung-Shan Medical University, Chung Shan Medical University Hospital, Taichung, Taiwan
|Date of Submission||20-Sep-2020|
|Date of Acceptance||21-Feb-2021|
|Date of Web Publication||01-Mar-2022|
Department of Pathology, Chung-Shan Medical University and Chung Shan Medical University Hospital, Taichung; Department of Obstetrics and Gynecology, Chung-Shan Medical University and Chung-Shan Medical University Hospital, Taichung
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Koo CL, Lee MY, Chao WR, Han CP. Both Kras gene mutation and Her2 gene mutation tend to exist in an inverse manner but not mutually exclusive in mucinous ovarian carcinoma: An analysis of 21 taiwanese women. J Can Res Ther 2022;18:862-3
|How to cite this URL:|
Koo CL, Lee MY, Chao WR, Han CP. Both Kras gene mutation and Her2 gene mutation tend to exist in an inverse manner but not mutually exclusive in mucinous ovarian carcinoma: An analysis of 21 taiwanese women. J Can Res Ther [serial online] 2022 [cited 2022 Aug 10];18:862-3. Available from: https://www.cancerjournal.net/text.asp?2022/18/3/862/338861
We identified that both the frequencies of either KRAS or HER2 gene mutation disagreed in primary mucinous ovarian carcinoma (mOC). This kind of tumor (i.e., mOC) is extremely rare, accounting for 2%–4% of all epithelial ovarian carcinomas. For years, there has been much discussion that mOC seems to be a unique disease owing to its specific biologic signatures. Oncogenes with activating mutations might be therapeutically targetable. We aimed to analyze the possible relationship between KRAS and HER2 gene alterations in 21 Taiwanese women with mOC.
In 2016, we presented that KRAS (human VKi-ras2 Kirsten rat sarcoma viral oncogene homolog) mutation rate was 61.90% (n = 13/21) in primary mOC. Although our solid data was similar to that reported by Anglesio and Mackenzie, we elucidated that the ~100% KRAS-mutant frequency reported by Jayson et al. (2014; Lancet) was too exaggerated to be applicable to all populations. Our earlier findings showed that two cases (50%) had wild-type Her2 gene, whereas the other two cases (50%) had Her2 gene missense mutations at that time, using four cases of Her2 FISH (+) mOC., However, the case number of that report was too small to faithfully take to mean the true result. After expanding the sample size, we identified that both the Her2 mutation rate and Her2 amplification rate were the same as 33.33% (n = 7/21; n = 7/21), independently. Nonetheless, their co-occurrence rate was 42.86% (n = 3/7).
Genomic DNAs extracted from formalin-fixed, paraffin-embedded tissue blocks of these 21 cases of mOC were re-evaluated. All the donors' identities have been permanently deleted. Both the KRAS and HER2 gene mutations were detected using the same methods described previously.,
When a contingency table of the results of both KRAS and HER2 gene mutations is drawn up, the frequencies of the agreement between the two oncogene mutations are shown along the diagonal of [Table 1] We present that both the KRAS and HER2 gene mutation rates were 61.90% (n = 13/21) and 33.33% (n = 7/21), respectively. The results revealed that both of them were negative in agreement (kappa = −0.412) and very close to the significant level (P = 0.056).
|Table 1: Contingency table of frequencies showing the comparison of both Kras and Her2 mutations in mucinous ovarian carcinoma|
Click here to view
Even though the negative kappa would indicate agreement worse than that expected by chance, our findings indicated that both KRAS and HER2 gene mutations tend to exist in an inverse manner but not mutually exclusive. However, once the two gene mutations coexist, they may even have a synergistic effect in tumorigenesis.
It is suggested that selected genetic alterations such as KRAS and Her2 gene-activating mutations involving Her2-driven RAS/mitogen-activated protein kinase signaling pathway can exist in mOC. In future, targeted therapy may be worth testing in such patients who have mOC with advanced stages.
Financial support and sponsorship
This work was supported by Chung Shan Medical University Hospital (CSH-2019-C-028 and CSH-2020-C-029), Taichung, Taiwan.
Conflicts of interest
There are no conflicts of interest.
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