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Optimal Extent of Superior Mesenteric Artery Dissection during Pancreaticoduodenectomy for Pancreatic Cancer: Balancing Surgical and Oncological Safety.

BACKGROUND: We describe the short- and long-term outcomes for PDAC patients after tailored mesopancreas dissection using supracolic artery-first approach followed by adjuvant therapy.

METHODS: This study analyzed 233 consecutive patients who underwent artery-first pancreaticoduodenectomy for PDAC. Dissection extent for the superior mesenteric artery (SMA) was categorized into three levels: level 2 (LV2) including regional lymph nodes, level 3 (LV3) with hemicircumferential nerve plexus dissection, and extended-level 3 (E-LV3) including borderline resectable cases for the SMA. All clinical, pathological, and survival outcomes were reviewed.

RESULTS: LV2/3/E-LV3 dissection was performed in 77/115/41 patients. The short-term outcomes were similar among groups without mortality. Although postoperative diarrhea requiring opioids was significantly more frequent in the E-LV3 group (76%) than other groups (vs. LV2 (21%), P < .0001; vs. LV3 (34%), P < .0001; LV2 vs. LV3, P = 0.20), most cases of diarrhea were well controlled. Adjuvant chemotherapy was introduced similarly among groups (LV2, 76%; LV3, 81%; E-LV3, 88%, P = 0.29). The 3- and 5-year overall survival rates in the LV2/3/E-LV3 groups were 42/33/42% and 27/22/26%, respectively, showing no significant difference among groups.

DISCUSSION: Our tailored dissection and preemptive use of opioid antidiarrheal effectively prevents intractable diarrhea, increasing the success of adjuvant chemotherapy.

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