Lavage cytology diagnosed by immunostaining may be a poor prognostic factor in pathological stage III colorectal cancer

IF 2.9 4区医学 Q2 GASTROENTEROLOGY & HEPATOLOGY

Annals of Gastroenterological Surgery Pub Date : 2024-10-01 DOI:10.1002/ags3.12863

Akitoshi Nankaku, Yusuke Yamaoka, Akio Shiomi, Hiroyasu Kagawa, Shoichi Manabe, Takuma Oishi, Kiyoshi Tone, Akifumi Notsu, Yusuke Kinugasa

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Abstract

Aim

To clarify the prognostic impact of positive lavage cytology diagnosed by immunostaining on long-term outcomes following curative resection for pathological stage III colorectal cancer (CRC).

Method

We retrospectively investigated patients who underwent radical resection and intraoperative lavage cytology (LCY) simultaneously for pathological stage III primary CRC between 2005 and 2017. All LCY specimens were evaluated by Papanicolaou staining and immunostaining for carcinoembryonic antigen and Ber-EP4. Only Class V diagnosed by either staining method was defined as positive LCY, and patients were classified into two groups: a positive lavage cytology (LCY+) group; and a negative lavage cytology (LCY−) group. Overall survival (OS) and relapse-free survival (RFS) were compared between groups. Multivariate analysis was performed to identify clinicopathological factors affecting OS and RFS.

Results

Among 708 patients with pathological stage III CRC, 30 patients (4.2%) showed positive LCY. OS and RFS were significantly lower in the LCY(+) group than in the LCY(−) group. Five-y OS rates in the LCY(+) and LCY(−) groups were 58.7% and 91.0%, respectively, and 5-y RFS rates were 28.8% and 76.6%, respectively. Multivariate analysis revealed that positive LCY was independently associated with lower OS and RFS. In the LCY(+) group, the proportion of patients with negative Papanicolaou staining but positive immunostaining was 20.0% (6 of 30). No significant differences in OS and RFS were evident between those patients and patients with positive results for both Papanicolaou staining and immunostaining.