Multidisciplinary neoadjuvant management for potentially curable pancreatic cancer

Ethical Considerations of Biopsies in Early-Stage Pancreatic Cancer

PURPOSE

The standard of care in resectable and borderline resectable pancreatic ductal adenocarcinoma (PDAC) has evolved to include neoadjuvant treatment before surgical resection. Current guidelines call for obtaining histologic tissue diagnosis via endoscopic ultrasound fine-needle aspiration before administration of neoadjuvant therapy, which differ from guidelines discouraging delay in surgical resection for a biopsy.

MATERIALS AND METHODS

Whether to proceed with treatment before a biopsy confirms that malignancy is a nuanced decision and includes considerations of physical and psychological risks entailed in both pursuing and forgoing a biopsy.

RESULTS

Accuracy of imaging and biopsy results, the presence of contributing clinical signs/symptoms, and the existing precedents of considering biopsies as waivable such as in scenarios with high clinical suspicion and primary surgical resection.

CONCLUSION

When considering the aspects of ethical medical practice including beneficence (doing good), nonmaleficence (avoiding harm), autonomy (allowing patients to make decisions about their care), and utilitarianism (doing the most good for the most people), analysis of whether guidelines guiding biopsies should continue to differ between resection and neoadjuvant treatments in PDAC is prudent.

A phase II study of neoadjuvant liposomal irinotecan with 5-FU and oxaliplatin (NALIRIFOX) in pancreatic adenocarcinoma

For patients with localized pancreatic cancer with minimal vascular involvement, optimal survivability requires a multidisciplinary approach of surgical resection and systemic chemotherapy. FOLFIRINOX is a combination chemotherapy regimen that offers promising results in the perioperative and metastatic settings; however, it can cause significant adverse effects. Such toxicity can negatively impact some patients, resulting in chemotherapy discontinuation or surgical unsuitability. In an effort to reduce toxicities and optimize outcomes, this investigation explores the safety and feasibility of substituting liposomal irinotecan (nal-IRI) for nonliposomal irinotecan to improve tumor drug delivery and potentially reduce toxicity. This regimen, NALIRIFOX, has the potential to be both safer and more effective when administered in the preoperative setting.

Multi-specialty physician perspectives on barriers and facilitators to the use of neoadjuvant therapy for pancreatic ductal adenocarcinoma

BACKGROUND

Neoadjuvant therapy (NT) is increasingly utilized for patients with localized pancreatic ductal adenocarcinoma (PDAC). Given the importance of completing multimodality therapy, the purpose of this qualitative study was to characterize physician perspectives on barriers and facilitators to delivering NT.

METHODS

A purposive sample of surgical, medical, and radiation oncologists participated in semi-structured interviews. Interviews were transcribed and coded by 3 independent researchers, iteratively identifying themes until saturation was achieved.

RESULTS

Participants (n = 27) were heterogeneous in specialty, years of experience, practice setting, gender, and geography. The most commonly cited advantage of NT was the ability to downstage patients. The most commonly cited barriers included lack of access and limited evidence. Patient preference for immediate surgery was frequently cited as a barrier, but most participants felt that patients eventually understood the treatment recommendation after informed discussion. Recommendations to enhance the delivery of NT included improved patient education, communication, and better evidence.

CONCLUSION

In this qualitative study, indications for, barriers to, and opportunities to improve the delivery of NT for localized PDAC were identified. These results highlight the need for better evidence and protocol standardization for NT as well as methods of improving care coordination, communication, and education to improve patient-centered outcomes.

Metagenomic analysis of gut microbiome reveals a dynamic change in Alistipes onderdonkii in the preclinical model of pancreatic cancer, suppressing its proliferation

Pancreatic cancer is a lethal cancer with aggressive and invasive characteristics. By the time it is diagnosed, patients already have tumors extended to other organs and show extremely low survival rates. The gut microbiome is known to be associated with many diseases and its imbalance affects the pathogenesis of pancreatic cancer. In this study, we established an orthotopic, patient-derived xenograft model to identify how the gut microbiome is linked to pancreatic ductal adenocarcinoma (PDAC). Using the 16S rDNA metagenomic sequencing, we revealed that the levels of Alistipes onderdonkii and Roseburia hominis decreased in the gut microbiome of the PDAC model. To explore the crosstalk between the two bacteria and PDAC cells, we collected the supernatant of the bacteria or cancer cell culture medium and treated it in a cross manner. While the cancer cell medium did not affect bacterial growth, we observed that the A. onderdonkii medium suppressed the growth of the pancreatic primary cancer cells. Using the bromodeoxyuridine/7-amino-actinomycin D (BrdU/7-AAD) staining assay, we confirmed that the A. onderdonkii medium inhibited the proliferation of the pancreatic primary cancer cells. Furthermore, RNA-seq analysis revealed that the A. onderdonkii medium induced unique transcriptomic alterations in the PDAC cells, compared to the normal pancreatic cells. Altogether, our data suggest that the reduction in the A. onderdonkii in the gut microbiome provides a proliferation advantage to the pancreatic cancer cells. KEY POINTS: • Metagenome analysis of pancreatic cancer model reveals A. onderdonkii downregulation. • A. onderdonkii culture supernatant suppressed the proliferation of pancreatic cancer cells. • RNA seq data reveals typical gene expression changes induced by A. onderdonkii.

Surgery for Recurrent Pancreatic Cancer: Is It Effective?

Despite improvements to surgical procedures and novel combinations of drugs for adjuvant and neoadjuvant therapies for pancreatic adenocarcinoma, the recurrence rate after radical surgery is still high. Little is known about the role of surgery in the treatment of isolated recurrences of pancreatic cancer. The aim of this study was to review the current literature dealing with surgery for recurrent pancreatic cancer in order to examine its feasibility and effectiveness. An extensive literature review was conducted according to the 2009 Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and 14 articles dealing with re-resections for recurrent pancreatic adenocarcinoma were analyzed, focusing on the characteristics of the primary neoplasm and its recurrence, the surgical procedures used, and patient outcomes. Data were retrieved on a total of 301 patients. The interval between surgery for primary pancreatic cancer and the detection of a recurrence ranged from 2 to 120 months. The recurrence was local or regional in 230 patients, and distant in 71. The median overall survival was 68.9 months (range 3–152) after resection of the primary tumor, and 26.0 months (range 0–112) after surgery for recurrent disease. The disease-free interval after the resection of recurrences was 14.2 months (range 4–29). Although data analysis was performed on a heterogeneous and limited number of patients, some of these may benefit from surgery for isolated recurrence of pancreatic adenocarcinoma. Further studies are needed to identify these cases.

Neo-adjuvant therapy for pancreatic cancer: hope for the future

In 2018, pancreatic ductal adenocarcinoma (PDAC) was the 3rd highest cause cancer related death in the United States. Worldwide estimates in 2018 indicate 458,918 cases diagnosed with 432,242 deaths. Standard therapy for decades for localized PDAC has been to pursue surgical resection for localized disease. For the individuals who are diagnosed with localized PDAC and undergo surgical resection, historical survival has been reported to be around 24 months. While recent advancements in the use of multiagent systemic therapy has allowed for greater survival benefit, adjuvant therapy does have limitations. Recently, neo-adjuvant therapy for PDAC has become more accepted in practice. Areas covered: In this review, we will discuss the current guidelines for treatment of localized PDAC, the pros and cons of neo-adjuvant versus adjuvant therapy for PDAC, the utilization of available biomarkers for the management of PDAC, and future possibilities for clinical trials. Expert commentary: Neo-adjuvant therapy for localized PDAC has tremendous promise in leading to greater survival by treating for micro-metastatic disease along with selecting for patients for better outcomes. Further work based upon molecular insights will lead to better biomarkers for treatment assessment along with improvements in treatment.

Neoadjuvant therapy offers longer survival than upfront surgery for poorly differentiated and higher stage pancreatic cancer

BACKGROUND

Neoadjuvant therapy for pancreatic cancer remains controversial. Our aim was to assess differences in survival, disease recurrence and histopathological tumor characteristics between patients treated with neoadjuvant therapy followed by subsequent surgery and patients undergoing upfront surgery.

MATERIAL AND METHODS

Out of 399 consecutive pancreatic ductal adenocarcinoma (PDAC) patients operated at Helsinki University Hospital in 2000-2015, 75 borderline resectable patients were treated with neoadjuvant therapy. Resectable propensity scored patients (n = 150) underwent upfront surgery. Neoadjuvant therapy consisted of folfirinox, single gemcitabine or combined with cisplatin, nab-paclitaxel or capecitabine with or without radiation. Survival was calculated with Kaplan-Meier and compared with the Breslow test. Survival was determined from the start of treatment, being the first day of treatment for patients treated with neoadjuvant therapy and the date of surgery for others.

RESULTS

Between 2000 and 2015 median disease-specific survival (DSS) [34 vs. 26 months, p = .016] and disease-free survival (DFS) [22 vs. 13 months, p = .001] were longer in patients treated with neoadjuvant therapy than in those undergoing upfront surgery. Survival differences were not significant in the 2000s but were, in turn, among patients treated in the 2010s with better survival for patients treated with neoadjuvant therapy [DSS 35 vs. 26 months, p = .008 and DFS 25 vs. 13 months, p = .001]. Especially patients with poorly differentiated G3 tumors [DSS 30 vs. 11 months, p = .004 and DFS 21 vs. 7 months, p = .001] and higher stage IIB-III [DSS 34 vs. 20 months, p = .006 and DFS 21 vs. 10 months, p = .001] had longer survival when treated with neoadjuvant therapy.

CONCLUSIONS

PDAC patients treated with neoadjuvant therapy had longer DSS and DFS than those undergoing upfront surgery. Neoadjuvant therapy benefits especially borderline resectable patients with higher stage and poorly differentiated tumors.

Recent Advances in Pancreatic Cancer Surgery

OPINION STATEMENT

Pancreatic cancer surgery is a continuously evolving field. Despite tremendous advances in perioperative outcomes, pancreatic resection is still associated with substantial morbidity, and mortality is not nil. Institutional caseload is a well-established determinant of patient outcomes, and centralization to experienced centers is essential to the safety and oncological appropriateness of the resection. Minimally invasive approaches are increasingly applied for pancreatic resection, even in cancer patients. Nevertheless, the level of evidence in this field remains low. Minimally invasive distal pancreatectomy appears potentially beneficial towards some perioperative outcomes, although its oncological results remain incompletely studied. Data regarding perioperative and oncologic outcomes for minimally invasive pancreaticoduodenectomy (Whipple's resection) is even less mature, but suggest that similar results as the open approach can be achieved in selected, high-volume centers. Conversely, its indiscriminate adoption by inexperienced surgeons and institutions has potential deleterious effects given its steep learning curve. Newer neoadjuvant treatment protocols display enhanced ability to downstage advanced tumors, increasing candidates for potentially curative surgery. Conversely, putative benefits of neoadjuvant treatment in patients with technically resectable tumors have not been reliably demonstrated and its optimal indications remain highly controversial.

Retrospective cohort analysis of neoadjuvant treatment and survival in resectable and borderline resectable pancreatic ductal adenocarcinoma in a high volume referral centre

BACKGROUND

Pancreatic ductal adenocarcinoma (PDAC) is a deadly disease. Neoadjuvant therapy (NA) with chemotherapy (NAC) and radiotherapy (RT) prior to surgery provides promise. In the absence of prospective data, well annotated clinical data from high-volume units may provide pilot data for randomised trials.

METHODS

Medical records from a tertiary hospital in Sydney, Australia, were analysed to identify all patients with resectable or borderline resectable PDAC. Data regarding treatment, toxicity and survival were collected.

RESULTS

Between January 1 2010 and April 1 2016, 220 sequential patients were treated: 87 with NA and 133 with upfront operation (UO). Forty-three NA patients (52%) and 5 UO patients (4%) were borderline resectable at diagnosis. Twenty-four borderline patients received NA RT, 22 sequential to NAC. The median overall survival (OS) in the NA group was 25.9 months (mo); 95% CI (21.1-43.0 mo) compared to 26.9 mo (19.7, 32.7) in the UO; HR 0.89; log-ranked p-value = 0.58. Sixty-nine NA patients (79%) were resected, mOS was 29.2 mo (22.27, not reached (NR)). Twenty-two NA (31%) versus 22 UO (17%) were node negative at operation (N0). In those managed with NAC/RT the mOS was 29.0 mo (17.3, NR). There were no post-operative deaths with NA within 90-days and three in the UO arm.

DISCUSSION

This is a hypothesis generating retrospective review of a selected real-world population in a high-throughput unit. Treatment with NA was well tolerated. The long observed survival in this group may be explained by lymph node sterilisation by NA, and the achievement of R0 resection in a greater proportion of patients.

The impact of neoadjuvant therapy on the histopathological features of pancreatic ductal adenocarcinoma - A systematic review and meta-analysis

BACKGROUND

Due to increased rates of curative tumor resections exceeding 60% after FOLFIRINOX-treatment, neoadjuvant therapy/NTx is increasingly recognized as an effective therapy option for downstaging borderline or locally advanced pancreatic ductal adenocarcinoma/PDAC. Yet, the effects of NTx on the common histopathological features of PDAC have not been systematically analysed. Therefore, the aim of the current study was to assess the impact of NTx on relevant histopathological features of PDAC.

PATIENTS AND METHODS

Biomedical databases were systematically screened for predefined searching terms related to NTx and PDAC. The Preferred-Reporting-Items-for-Systematic-review-and-Meta-Analysis/PRISMA-guidelines were used to perform a systematic review and meta-analysis. Articles meeting the predefined criteria were analysed on relevance, and a meta-analysis was performed.

RESULTS

A total of 9031 studies could be identified that analysed the effect of NTx on PDAC. Only 35 studies presented comparative data on the histological features of neoadjuvantly treated vs. upfront resected PDAC patients. In meta-analyses, the beneficial effect of NTx was reflected by reduced tumor size (T1/2: RR 2.87, 95%-CI: 1.52-5.42, P=0.001, T3/4: RR 0.78, 95%-CI: 0.69-0.89, P=0.0002), lower N-Stage (N0: RR 2.14, 95%-CI: 1.85-2.46, P<0.00001, N1: RR 0.59, 95%-CI: 0.53-0.65, P<0.00001), higher R0-rates (R0: RR 1.13, 95%-CI: 1.08-1.18, P<0.00001, R1: RR 0.66, 95%-CI: 0.58-0.76, P<0.00001), less perineural invasion (Pn1: RR 0.78, 95%-CI: 0.73-0.83, P<0.00001), less lymphatic vessel invasion (RR: 0.50, 95%-CI: 0.36-0.70, P<0.0001) and fewer G3-tumors (RR 0.82, 95%-CI: 0.71-0.94, P=0.005).

CONCLUSIONS

NTx in PDAC seems to exert its beneficial effect in borderline or locally advanced PDAC over genuine tumor downstaging. Thus, although at least 40% of all NTx treated patients remain unresectable even with modern NTx regimes, neoadjuvantly treated PDAC showed not only increasing resectability rates especially after FOLFIRINOX, but even reach a lower tumor stage than primarily resected PDAC.

Neoadjuvant therapy versus upfront surgery for resected pancreatic adenocarcinoma: A nationwide propensity score matched analysis

BACKGROUND

Neoadjuvant therapy is an emerging paradigm in pancreatic cancer care; however, its role for resectable disease remains controversial in the absence of conclusive randomized controlled trials. The purpose of the present study is to assess the impact of neoadjuvant therapy on survival in resected pancreatic cancer patients by clinical stage.

METHODS

A retrospective cohort study using the National Cancer Data Base from 2004 to 2012 including nonmetastatic pancreatic adenocarcinoma patients who underwent pancreatectomy and initiated chemotherapy. Propensity score matching within each stage was used to account for potential selection bias between patients undergoing neoadjuvant therapy and upfront surgery. Overall survival was compared by the Kaplan-Meier method.

RESULTS

In the study, 1,541 and 7,159 patients received neoadjuvant therapy followed by surgery and upfront surgery succeeded by adjuvant therapy, respectively. In clinical stage III pancreatic cancer (n = 486), neoadjuvant therapy was associated with significant survival benefit after matching (median survival 22.9 vs 17.3 months; log-rank P < .0001) compared with conventional upfront surgery followed by adjuvant therapy; however, no survival difference was found between the 2 treatment sequences in patients with clinical stage I (n = 3,149; median survival, 26.2 vs 25.7 months; P = .4418) and II (n = 5,065; median survival, 23.5 vs 23.0 months; P = .7751) disease after matching.

CONCLUSION

The survival impact of neoadjuvant therapy is stage-dependent. Neoadjuvant therapy does not disadvantage survival compared with conventional upfront surgery followed by adjuvant therapy in any stage, and is associated with a significant survival advantage in stage III pancreatic cancer.

Prognostic value of occult tumor cells obtained by peritoneal lavage in patients with resectable pancreatic cancer and no ascites: A systematic review

The poor survival of patients with resectable pancreatic cancer might be related to the presence of occult peritoneal tumor cells (OPTC). This systematic review studies the prognostic value of cytology and carcinoembryonic antigen (CEA) by real-time polymerase chain reaction in peritoneal fluid. The results suggest that presence of OPTC is related to a worse survival in patients with resectable pancreatic cancer. Future studies should investigate its possible role in selecting patients for specific treatment strategies. J. Surg. Oncol. 2016;114:743-751. © 2016 Wiley Periodicals, Inc.

Perioperative chemotherapy is associated with a survival advantage in early stage adenocarcinoma of the pancreatic head

BACKGROUND

The value of neoadjuvant chemotherapy in the treatment of early stage pancreatic cancer is not yet clear.

METHODS

We evaluated patients from the National Cancer Data Base who underwent pancreaticoduodenectomy for clinical stage I and II pancreatic adenocarcinoma between 2006 and 2012.

RESULTS

In total, 7,881 patients were identified. Of these, 27.5% received no chemotherapy, 57.4% received adjuvant chemotherapy, 10.2% received neoadjuvant chemotherapy alone, and 4.9% received perioperative chemotherapy, both preoperative and postoperative chemotherapy. Neoadjuvant chemotherapy use (neoadjuvant chemotherapy alone and perioperative chemotherapy) increased from 12.0% in 2006 to 20.2% in 2012. Patients who received chemotherapy prior to the operation (neoadjuvant chemotherapy alone and perioperative chemotherapy) had greater rates of margin negative (80.2% vs 73.0%, P < .001) and node negative (58.2% vs 28.7%, P < .001) resections and shorter mean durations of stay (12.0 vs 11.1 days, P = .012) than those receiving either adjuvant chemotherapy or no chemotherapy at all. There were no differences in 30-day unplanned readmissions (P = .074) and 90-day mortality (P = .227). On Cox survival analysis, adjusted for clinical variables including age and comorbid disease, patients undergoing perioperative chemotherapy, adjuvant chemotherapy, and neoadjuvant chemotherapy alone demonstrated significantly improved overall survival relative to that of patients undergoing resection alone (all P < .001). Patients receiving perioperative chemotherapy demonstrated a significant overall survival advantage compared with those receiving adjuvant chemotherapy (hazard ratio 0.75; 95% confidence interval, 0.65-0.85). Neoadjuvant chemotherapy alone had a marginal overall survival benefit compared with adjuvant chemotherapy (hazard ratio 0.89; 95% confidence interval, 0.81-0.98).

CONCLUSION

Early stage pancreatic cancer patients who receive perioperative chemotherapy have better overall survival than those receiving no chemotherapy, adjuvant chemotherapy, or neoadjuvant chemotherapy alone. Patterns of postoperative morbidity are similar regardless of the sequence of therapy. Neoadjuvant chemotherapy should be considered for patients presenting with early stage pancreatic cancer.

Neoadjuvant multimodal treatment of pancreatic ductal adenocarcinoma

Treatment of pancreatic ductal adenocarcinoma (PDAC) is increasingly multidisciplinary, with neoadjuvant strategies (chemotherapy, radiation, and surgery) administered in patients with resectable, borderline resectable, or locally advanced disease. The rational supporting this management is the achievement of both higher margin-negative resections and conversion rates into potentially resectable disease and in vivo assessment of novel therapeutics. International guidelines suggest an initial staging of the disease followed by a multidisciplinary approach, even considering the lack of a treatment approach to be considered as standard in this setting. This review will focus on both literature data supporting these guidelines and on new opportunities related to current more active chemotherapy regimens. An analysis of the pathological assessment of response to therapy and the potential role of target therapies and translational biomarkers and ongoing clinical trials of significance will be discussed.