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KRAS mutation in primary ovarian serous borderline tumors correlates with tumor recurrence

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Abstract

Oncogenic activation of the mitogen-activated protein kinase (MAPK) pathway due to KRAS or BRAF gain-of-function mutation is frequently found in ovarian serous borderline tumor (SBT) and their extraovarian implants. We investigated mutational status of KRAS and BRAF of the primary ovarian SBTs that had a high stage presentation in correlation with clinical outcome. Among 39 consecutive primary SBTs with either invasive implants (20 cases) or non-invasive implants (19 cases), KRAS and BRAF mutational analysis was informative in 34 cases. Sixteen cases (47%) harbored a KRAS mutation, while 5 cases (15%) had a BRAF V600E mutation. High-stage disease (IIIC) was seen in 31% (5/16) of patients with a KRAS mutation and 39% (7/18) of patients without a KRAS mutation (p = 0.64). KRAS mutations were present in 9/16 (56%) tumors with invasive implants/LGSC versus 7/18 (39%) tumors with non-invasive implants (p = 0.31). BRAF mutation was seen in 5 cases with non-invasive implants. Tumor recurrence was seen in 31% (5/16) of patients with a KRAS mutation, compared to 6% (1/18) of patients without a KRAS mutation (p = 0.04). A KRAS mutation predicted an adverse disease-free survival (31% survival at 160 months) compared to those with wild-type KRAS (94% at 160 months; log-rank test, p = 0.037; HR 4.47). In conclusion, KRAS mutation in primary ovarian SBTs is significantly associated with a worse disease-free survival, independent of the high tumor stage or histological subtypes of extraovarian implant. KRAS mutation testing of primary ovarian SBT may servce as a useful biomarker for tumor recurrence.

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Dr. Austin McHenry conducted study case selection, data collection and analysis, and drafted the manuscript. Dr. Douglas Rottmann conducted initial study case selection and data collection. Dr. Natalia Buza conducted study data review and contributed to the writing of the manuscript. Dr. Pei Hui designed the study, conducted data review and analysis, and finilized the manucirpt.

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Correspondence to Pei Hui.

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McHenry, A., Rottmann, D.A., Buza, N. et al. KRAS mutation in primary ovarian serous borderline tumors correlates with tumor recurrence. Virchows Arch 483, 71–79 (2023). https://doi.org/10.1007/s00428-023-03564-z

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