Abstract
317 Background: Resection for unresectable LAPC after down-staging by chemo(radio)therapy sometimes leads to long-term survival in highly selected pts. However, neither the pts who have best possibility for resection nor resection rate according to the specific treatment were elucidated in LAPC. Methods: A retrospective single-institutional study. From a prospective database, 130 pts received any treatment for LAPC from Jan. 2010 to Mar. 2015 were identified. Main criteria for unresectability were tumor contact with superior mesenteric artery, celiac axis or common hepatic artery > 180°, aortic involvement, and unreconstructible portal vein /superior mesenteric vein due to marked invasion. All MDCT findings before and during treatment of 130 pts were reviewed to check the resectability by a surgeon. Conversion rate to resection according to treatment and situation of tumor-vessel contact before treatment were analyzed. Conversion was considered when tumor was down-staged to borderline resectability. Results: Of 130 pts, gemcitabine (GEM) was administered as initial treatment to 75; GEM and erlotinib to 18; modified FOLFIRINOX to 15; S-1 and concurrent radiotherapy (S1/RT) to 12; GEM and nab-paclitaxel (GEM+nabPTX) to 4; and other regimens to 6. Six patients underwent resection after down-staging. Of the 6 pts (4.6%), 4 received S1/RT, and 1 each received GemErlo and FOLFIRINOX. Furthermore, 7 pts (5.4%) seemed to deserve further examination to check resectability because marginal resectability was shown in follow up MDCT during treatment. Resection rates among treatments were not different significantly. On the other hand, unresectability because of single-vessel invasion and the tumor-vessel contact less than 360° at the same time before treatment showed best opportunity for conversion to resection. The 6 resected pts (MST 30m) showed marginal superiority over unresected 124 pts (MST 16m) in survival (p = 0.17). Conclusions: Resection rate of LAPC did not increase significantly even after FOLFIRINOX or GEM+nabPTX treatment. Pts with LAPC due to single tumor-vessel contact less than 360° have best chance of convert to resection after effective treatment.
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