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Characteristics and prognostic significance of incidentally detected cancer cells in uterine specimens of patients with pelvic high-grade serous carcinoma.

OBJECTIVE: Cases of pelvic high-grade serous carcinoma (HGSC) with incidentally detected cancer cells (ICCs) in endometrial and/or cervicovaginal cytology have been reported. This study aimed to clarify the incidence and characteristics of pelvic HGSC with ICCs and to determine whether ICCs have a negative prognostic impact.

METHODS: Patients with ovarian/tubal/peritoneal HGSC who underwent pre-treatment uterine (endometrial/cervicovaginal) cytology or biopsy between January 2007 and May 2017 were included. We reviewed the frequencies of ICCs and compared the clinicopathological features and survival outcome between the ICC-positive and ICC-negative groups.

RESULTS: Of the 160 patients evaluated, 69 (43.2%) had positive ICCs in at least one uterine specimen. There were no significant differences in clinicopathologic characteristics, such as age, FIGO stage, serum CA125 level, ascites, and tubal lesion, between the two groups. Moreover, ICCs had no significant survival impact on progression-free survival and overall survival.

CONCLUSION: Our study showed a high rate of pelvic HGSC with ICCs in pre-treatment uterine specimens. The ICCs per se had no negative impact on survival outcomes of pelvic HGSC. Furthermore, uterine biopsy and cytology can be useful and less-invasive methods to obtain tubo-ovarian/peritoneal cancer cells before treatment.

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