Contemporary trials evaluating neoadjuvant therapy for resectable pancreatic cancer

Regional intra-arterial vs. systemic chemotherapy for the treatment of advanced pancreatic cancer: a systematic review and meta-analysis

Introduction

Pancreatic cancer is a highly aggressive malignancy with limited response to chemotherapy. This research aims to compare the effectiveness and safety of regional intra-arterial chemotherapy (RIAC) with conventional systemic chemotherapy in treating advanced stages of pancreatic cancer.

Methods

A comprehensive literature review was conducted using databases such as PubMed, Embase, Web of Science, and the Cochrane Library. Studies assessing the comparative outcomes of RIAC and systemic chemotherapy were included. Data extraction and quality evaluation were performed independently by two researchers. Statistical analysis was conducted using STATA16 software, calculating odds ratios (OR), risk differences (RD), and 95% confidence intervals (CI).

Results

Eleven studies, comprising a total of 627 patients, were included in the meta-analysis. The findings showed that patients undergoing RIAC had significantly higher rates of partial remission (PR) compared to those receiving systemic chemotherapy (OR = 2.23, 95% CI: 1.57, 3.15, I2= 0%). Additionally, the rate of complications was lower in the RIAC group (OR = 0.45, 95% CI: 0.33, 0.63, I2= 0%). Moreover, patients treated with RIAC had notably longer median survival times.

Discussion

The results of this research indicate that RIAC is associated with a higher rate of partial remission, improved clinical benefits, and fewer complications compared to systemic chemotherapy in the management of advanced pancreatic cancer. These findings suggest that RIAC may be a more effective and safer treatment option for patients with advanced stages of pancreatic cancer.

Systematic review registration

https://www.crd.york.ac.uk/prospero/, identifier CRD42023404637.

Gastrointestinal Malignancies: Pancreatic Cancer Clinical Trials in Neoadjuvant Chemotherapy

Surgical resection is the only known treatment associated with long-term survival in pancreatic adenocarcinoma. While adjuvant therapy has shown a clear survival benefit, neoadjuvant chemotherapy has gained interest due to its ability to prioritize the treatment of micrometastatic disease prior to resection and improve chemotherapy tolerance prior to a major operation. Investigations have focused on evaluating the survival benefit of neoadjuvant therapy using single and combination chemotherapy as well as radiation therapy. Landmark trials in localized pancreatic cancer have paved the way for the standard use of neoadjuvant therapy for pancreatic adenocarcinoma.

Major Postoperative Complications Limit Adjuvant Therapy Administration in Patients Undergoing Pancreatoduodenectomy for Distal Cholangiocarcinoma or Pancreatic Ductal Adenocarcinoma

INTRODUCTION

Guidelines for perioperative systemic therapy administration in patients undergoing pancreatoduodenectomy for pancreatic adenocarcinoma (PDAC) and distal cholangiocarcinoma (dCCA) are evolving. Decisions regarding adjuvant therapy are influenced by postoperative morbidity, which is common after pancreatoduodenectomy. We evaluated whether postoperative complications are associated with receipt of adjuvant therapy after pancreatoduodenectomy.

METHODS

A retrospective analysis of patients undergoing pancreatoduodenectomy for PDAC or dCCA from 2015 to 2020 was conducted. Demographic, clinicopathologic, and postoperative variables were analyzed.

RESULTS

Overall, 186 patients were included-145 with PDAC and 41 with dCCA. Postoperative complication rates were similar for both pathologies (61% and 66% for PDAC and dCCA, respectively). Major postoperative complications (MPCs), defined as Clavien-Dindo >3, occurred in 15% and 24% of PDAC and dCCA patients, respectively. Patients with MPCs received lower rates of adjuvant therapy administration, irrespective of primary tumor (PDAC: 21 vs. 72%, p = 0.008; dCCA: 20 vs. 58%, p = 0.065). Recurrence-free survival (RFS) was worse for patients with PDAC who experienced an MPC [8 months (interquartile range [IQR] 1-15) vs. 23 months (IQR 19-27), p < 0.001] or who did not receive any perioperative systemic therapy [11 months (IQR 7-15) vs. 23 months (IQR 18-29), p = 0.038]. In patients with dCCA, 1-year RFS was worse for patients who did not receive adjuvant therapy (55 vs. 77%, p = 0.038).

CONCLUSION

Patients who underwent pancreatoduodenectomy for either PDAC or dCCA and who experienced an MPC had lower rates of adjuvant therapy and worse RFS, suggesting that clinicians adopt a standard neoadjuvant systemic therapy strategy in patients with PDAC. Our results propose a paradigm shift towards preoperative systemic therapy in patients with dCCA.

Pancreatic cancer

The need for a common education and training track in surgical oncology across Europe has been emphasized. ESSO provides several hands-on courses for skills training and face-to-face discussions. The core curriculum provides a framework for the overall theoretical requirements in surgical oncology. The UEMS/EBSQ fellowship exam is designed to test core competencies in the candidate's core knowledge in their prespecified area of expertise. A core set of points for each cancer type is lacking. Hence, a condensed outline of themed expected to be covered in the curriculum and relevant to an optimal practice in surgical oncology is provided. This article outlines pancreatic cancer.

Neoadjuvant Treatment Lowers the Risk of Mesopancreatic Fat Infiltration and Local Recurrence in Patients with Pancreatic Cancer

Simple Summary

After the implementation of an in-depth histopathological pancreas protocol, curative resection rates for pancreatic head cancers have drastically dropped. Standardized extended resections using embryo-anatomic landmarks (MPE), have recently been prooved to increase margin-negative resection rates. The mesopancreatic fat, excised during these extended resections, was infiltrated in the majority of the patients. Neoadjuvant treatment is an emerging topic of interest for pancreatic cancer patients. It remains unclear if these extended resections are still warranted in patients after neoadjuvant treatment. Neoadjuvant treatment lowered the risk for mesopancreatic fat infiltration and patients were less prone to local recurrence and margin positive resections when compared to patients after upfront surgery. However, the majority of the patients are yet diagnosed with mesopancreatic fat infiltration, justifying this extended approach synergistically with the treatment strategies for colorectal cancer.

Abstract

Background: Survival following surgical treatment of ductal adenocarcinoma of the pancreas (PDAC) remains poor. The recent implementation of the circumferential resection margin (CRM) into standard histopathological evaluation lead to a significant reduction in R0 rates. Mesopancreatic fat infiltration is present in ~80% of PDAC patients at the time of primary surgery and recently, mesopancreatic excision (MPE) was correlated to complete resection. To attain an even higher rate of R0(CRM−) resections in the future, neoadjuvant therapy in patients with a progressive disease seems a promising tool. We analyzed radiographic and histopathological treatment response and mesopancreatic tumor infiltration in patients who received neoadjuvant therapy prior to MPE. The aim of our study was to evaluate the need for MPE following neoadjuvant therapy and if multi-detector computed tomographically (MDCT) evaluated treatment response correlates with mesopancreatic (MP) infiltration. Method: Radiographic, clinicopathological and survival parameters of 27 consecutive patients who underwent neoadjuvant therapy prior to MPE were evaluated. The mesopancreatic fat tissue was histopathologically analyzed and the 1 mm-rule (CRM) was applied. Results: In the study collective, both the rate of R0 resection R0(CRM−) and the rate of mesopancreatic fat infiltration was 62.9%. Patients with MP infiltration showed a lower tumor response. Surgical resection status was dependent on MP infiltration and tumor response status. Patients with MDCT-predicted tumor response were less prone to MP infiltration. When compared to patients after upfront surgery, MP infiltration and local recurrence rate was significantly lower after neoadjuvant treatment. Conclusion: MPE remains warranted after neoadjuvant therapy. Mesopancreatic fat invasion was still evident in the majority of our patients following neoadjuvant treatment. MDCT-predicted tumor response did not exclude mesopancreatic fat infiltration.

Neoadjuvant FOLFIRINOX Therapy Is Associated with Increased Effector T Cells and Reduced Suppressor Cells in Patients with Pancreatic Cancer

PURPOSE

FOLFIRINOX has demonstrated promising results for patients with pancreatic ductal adenocarcinoma (PDAC). Chemotherapy-induced immunogenic cell death can prime antitumor immune responses. We therefore performed high-dimensional profiling of immune cell subsets in peripheral blood to evaluate the impact of FOLFIRINOX on the immune system.

EXPERIMENTAL DESIGN

Peripheral blood mononuclear cells (PBMC) were obtained from treatment-naïve (n = 20) and FOLFIRINOX-treated patients (n = 19) with primary PDAC tumors at the time of resection. PBMCs were characterized by 36 markers using mass cytometry by time of flight (CyTOF).

RESULTS

Compared with treatment-naïve patients, FOLFIRINOX-treated patients showed distinct immune profiles, including significantly decreased inflammatory monocytes and regulatory T cells (Treg), increased Th1 cells, and decreased Th2 cells. Notably, both monocytes and Treg expressed high levels of immune suppression-associated CD39, and the total CD39+ cell population was significantly lower in FOLFIRINOX-treated patients compared with untreated patients. Cellular alterations observed in responders to FOLFIRINOX included a significantly decreased frequency of Treg, an increased frequency of total CD8 T cells, and an increased frequency of CD27-Tbet+ effector/effector memory subsets of CD4 and CD8 T cells.

CONCLUSIONS

Our study reveals that neoadjuvant chemotherapy with FOLFIRINOX enhances effector T cells and downregulates suppressor cells. These data indicate that FOLFIRINOX neoadjuvant therapy may improve immune therapy and clinical outcome in patients with PDAC.