Abstract:
BACKGROUND:Borderline resectable pancreatic cancer (BRPC) is frequently associated with positive surgical margins and a poor prognosis because the tumor is in contact with major vessels. This study evaluated the relationship between the margin-negative (R0) resection rate and findings indicating peripancreatic vascular invasion on multidetector computed tomography (MDCT) imaging after neoadjuvant chemoradiotherapy (NACRT) in patients with BRPC. METHODS:Twenty-nine BRPC patients who underwent laparotomy after neoadjuvant S-1 with concurrent radiotherapy were studied retrospectively. Peripancreatic major vessel invasion was evaluated based on the length of tumor-vessel contact on MDCT. The R0 resection rates were compared between the progression of vascular invasion (PVI) group and the non-progression of vascular invasion (NVI) group. RESULTS:There were 3 patients with partial responses (10%), 25 with stable disease (86%), and 1 with progressive disease (3%) according to the RECISTv1.1 criteria. Regarding vascular invasion, 9 patients (31%) were classified as having PVI, and 20 patients (69%) were classified as having NVI. Of the 29 patients, 27 (93%) received an R0 resection, and all the PVI patients received an R0 resection (9/9; R0 resection rate = 100%) while 90% (18/20) of the NVI patients underwent an R0 resection. The exact 95% confidence interval of risk difference between those R0 resection rates was - 10.0% [- 31.7-20.4%]. CONCLUSIONS:Patients with BRPC after NACRT achieved high R0 resection rates regardless of the vascular invasion status. BRPC patients can undergo R0 resections unless progressive disease is observed after NACRT. TRIAL REGISTRATION:UMIN-CTR, UMIN000009172 . Registered 23 October 2012.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Yasuta S,Kobayashi T,Aizawa H,Takahashi S,Ikeda M,Konishi M,Kojima M,Kuno H,Uesaka K,Morinaga S,Miyamoto A,Toyama H,Takakura N,Sugimachi K,Takayama Wdoi
10.1186/s12885-020-07698-0subject
Has Abstractpub_date
2020-12-02 00:00:00pages
1184issue
1issn
1471-2407pii
10.1186/s12885-020-07698-0journal_volume
20pub_type
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