Society: SSAT

Background
Pancreatic ductal adenocarcinoma (PDAC) exists in several morphological subtypes differing in prognostic significance. However, to date, a clinico-morphological correlation of these subtypes in the context of neoadjuvant therapy (NAT) has not been performed. The aim of this study was 1) to investigate the frequency of the different PDAC morphologies in patients undergoing radical intent pancreatectomy after NAT; and 2) to determine the prognostic impact of the presence of a secondary morphology in the primary tumor.

Methods
All patients who underwent pancreatic resection after NAT for PDAC (2013-2019) at one academic institution were enrolled. All pathological samples were included in toto and reviewed by experienced pathologists. The presence of a secondary morphology in the primary tumor specimen was determined according to a morphological cut-off ≥10%. Tumor regression grade (TRG) was classified according to the MDACC Scoring system. The clinico-pathological characteristics and the survival of the cohort were studied by means of conventional statistical analyses.

Results
Among the 401 included patients 205 (51,5%) received Folfirinox, 134 (33,7%) gemcitabine/nab-paclitaxel. The median follow-up was 28.0 months, and the median disease specific survival (DSS) was 29.7 months. The median DSS associated to the principal tumor morphologies and their relative frequencies is shown in the Table. Gland forming PDAC with conventional morphology (n=167, 41,6%) was the most frequent subtype. Overall, no significant difference in DSS was observed. After pairwise comparison, the papillary morphology shown a significant higher survival rate compared to other less frequent subtypes (cribiform, p<0.019; gyriform, p<0.008; micropapillary, p<0.048; and adenosquamous, p<0.006). Overall, 247 (61,1%) displayed only a single principal tumor morphology, while 154 (38,4%) presented an additional secondary morphology in the primary tumor. PDACs harboring a secondary tumor morphology shown a significantly more advanced pathological profile and a higher TRG, as well as significantly shorter DSS and recurrence free survival (RFS) (Figure). At multivariable Cox regression, the presence of a secondary tumor morphology was independently associated with worse DSS (HR 1.881, 95% CI 1.384-2.557, p<0.001) and RFS (HR 1.635, 95% CI 1.230-2.175, p<0.001).

Conclusion
In patients receiving pancreatectomy after NAT, the presence of a secondary morphology in the primary tumor is frequent, occurring in over one third of the cases. This feature is associated with a less favorable pathological profile and a higher TRG, and represents an independent predictor of shorter DSS and RFS. Based on these findings, including a detailed morphological description in pancreatectomy pathology reports might provide valuable prognostic information and possibly help post-surgical decision-making.

Background: Surgical resection is necessary for the curative treatment of periampullary malignancies. Many patients will undergo endoscopic retrograde cholangiopancreatography (ERCP) prior to surgery, for obstructive jaundice or diagnostic purposes. Post-ERCP pancreatitis (PEP) is one of the most common complications of this procedure, but its impact on postoperative outcomes is not well studied. We hypothesize that patients who experience PEP will experience worse postoperative outcomes.

Methods: All patients with periampullary malignancies who underwent surgical resection between 2017-2020 at a single, high-volume institution were reviewed from a prospectively maintained database. Post-ERCP pancreatitis was defined as clinically significant pancreatitis requiring post-procedure or prolonged admission, as outlined by Cotton et al (1991). Groups were compared with Mann-Whitney U-tests for continuous variables and chi-squared or Fisher’s exact tests for categorical variables. Multivariable analysis was performed with logistic regression.

Results: Four hundred fifty-five patients underwent surgical resection for periampullary malignancy in the studied time frame, of which 317 patients underwent preoperative ERCP: 237(74.8%) for pancreatic cancer, 51(16.1%) ampullary cancer, 22(6.9%) distal cholangiocarcinoma, 4(1.3%) duodenal cancer, and 2(0.9%) pancreatic neuroendocrine tumors. A total of 27(8.8%) patients developed post-ERCP pancreatitis. Groups were comparable in demographics, comorbidities, clinical stage and tumor resectability. There was no significant difference in frequency of neoadjuvant therapy (NAT) (p=0.16). PEP was associated with greater estimated blood loss during surgery (300[300] vs 500[550] mL, p=0.03). There was no significant difference in operative time, post-operative length of stay, 30-day readmission rate and 30- and 90-day mortality rate. While overall complication rates did not differ between groups (p=0.12), PEP patients experienced higher rates of complications Clavien-Dindo class III or above (10.7% vs 33.3%, p<0.01), including clinically relevant postoperative pancreatic fistulas (CR-POPF) (7.9% vs 25.9%, p<0.01). On multivariable analysis, PEP remained independently associated with CR-POPF after adjusting for gland texture, duct diameter, EBL, and pathology (OR 4.88, 95% CI: 1.62–14.68, p<0.01), as well as class III or higher complications after adjusting for age, EBL, pathology, and other factors (OR 6.79, 95% CI: 2.22–18.89, p<0.01).

Conclusions: Patients with periampullary malignancies who develop PEP are at higher risk for major complications after surgery, including clinically relevant postoperative pancreatic fistulas. Post-ERCP pancreatitis should be considered a strong risk factor for postoperative morbidity and CR-POPF, suggesting that PEP patients may require alternative fistula mitigation approaches.

Background:Multidrug adjuvant therapy following pancreatectomy has yielded substantial improvement in the prognosis of pancreatic cancer patients with localized disease, establishing a new treatment paradigm. However, out of controlled experimentalsettings, the proportion of patients accessing modern chemotherapy regimens is largely unknown
Methods:A prospective, observational study was conducted. All consecutive patients receiving primary curative surgery for pancreatic ductal carcinoma (Jan 2019 - Jul 2022) were enrolled(#NCT03788382). The primary aim is to define actual adjuvant treatment utilization and its association with baseline and perioperative patient characteristics. Medical oncologist charts were retrieved along with close patient follow-up. A precision-based approach was used to calculate sample size
Results:317 patients underwent pancreatectomy, among which 237 (74.8%) received subsequent adjuvant therapy after a median of eight weeks (IQR 6-10) after surgery. Among such, Gemcitabine alone and FOLFIRINOX were employed in 42% and 38% of cases, respectively, followed by Gemcitabine-based(16%) and other regimes (5%). Main reasons for chemotherapy omission were postoperative failure-to-thrive (39%), baseline comorbidities (20%), and physician’s decision (21%). Patient refusal and early disease recurrence also accounted for 20%. The likelihood of postoperative therapy omission steadily increased with age up to 50% for individuals older than 80. It varied across geographical areas, being twice as high for inhabitants of Northern Italy regions compared to Central and Southern areas (30 vs 15%).Older age (OR 1.10,95%CI 1.011-1.14), family history of pancreatic cancer (OR 2.46,95%CI 1.33-4.56) and developing postoperative pancreatic fistula (OR 2.54,95%CI 11.05-6.18) were primary determinant of attrition after surgery, whereas no pathological parameter influenced adjuvant therapy initiation.Adjuvant FOLFIRINOX utilization increased tenfold over the study period (from 4.1 to 44.2%).Patients receiving such a regimen were significantly younger (median 65 vs.74 years old,OR 0.86,95%CI 0.81-0.90; p<0.001) and displayed more advanced N stage (vs.
N0: N1 OR 3.10; N2 OR 2.87), while alcohol abuse (OR 0.26,95%CI 0.09-0.78) and developing severe complications (Clavien-Dindo≥3; OR 0.24,95%CI 0.07-0.85) were associated with FOLFIRINOX omission. No difference was evident in time to chemotherapy initiation between FOLFIRINOX and other schemes
Discussion:This study provides a contemporary, real-world snapshot depicting a limited utilization of adjuvant therapy following curative resection for localized pancreatic cancer. Despite FOLFIRINOX being increasingly employed in this setting, one out of four patients still fails to receive any postoperative chemotherapy, mostly due to postoperative complications, and most patients are treated with suboptimal regimens

Giuseppe Malleo

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