Predictors and benefits of multiagent chemotherapy for pancreatic adenocarcinoma: Timing matters

INTRODUCTION

Adjuvant (A) multiagent chemotherapy (MC) is the standard of care for patients with pancreatic adenocarcinoma (PDAC). Tolerating MC following a morbid operation may be difficult, thus neoadjuvant (NA) treatment is preferable. This study examined how the timing of chemotherapy was related to the regimen given and ultimately the overall survival (OS).

METHODS

The National Cancer Database was queried from 2006 to 2017 for nonmetastatic PDAC patients who underwent surgical resection and received MC or single-agent chemotherapy (SC) pre- or postresection. Predictors of receiving MC were determined using multivariable logistic regression. Five-year OS was evaluated using the Kaplan-Meier and Cox proportional hazards model.

RESULTS

A total of 12,440 patients (NA SC, n = 663; NA MC, n = 2313; A SC, n = 6152; A MC, n = 3312) were included. MC utilization increased from 2006-2010 to 2011-2017 (33.1%-49.7%; odds ratio [OR]: 0.59; p < 0.001). Younger age, fewer comorbidities, higher clinical stage, and larger tumor size were all associated with receipt of MC (all p < 0.001), but NA treatment was the greatest predictor (OR 5.18; 95% confidence interval [CI]: 4.63-5.80; p < 0.001). MC was associated with increased median 5-year OS (26.0 vs. 23.9 months; hazard ratio [HR]: 0.92; 95% CI: 0.88-0.96) and NA MC was associated with the highest survival (28.2 months) compared to NA SC (23.3 months), A SC (24.0 months), and A MC (24.6 months; p < 0.001).

CONCLUSION

Use and timing of MC contribute to OS in PDAC with an improved 5-year OS compared to SC. The greatest predictor of receiving MC was being given as NA therapy and the greatest survival benefit was the NA MC subgroup. Randomized studies evaluating the timing of effective MC in PDAC are needed.

Impact of Adherence to Operative Standards and Stage-Specific Guideline-Recommended Therapy in Nonmetastatic Pancreatic Adenocarcinoma

BACKGROUND

Achieving optimal surgical outcomes in pancreatic adenocarcinoma requires a combination of both curative-intent resection to oncologic standards and stage-specific neoadjuvant or adjuvant therapy. This investigation sought to examine factors associated with receipt of standard-adherent surgery (SAS) and guideline-recommended therapy (GRT) and determine the impact of compliance on patient survival.

PATIENTS AND METHODS

From the 2006-2016 National Cancer Database, 21,304 patients underwent resection for nonmetastatic pancreatic adenocarcinoma. SAS was defined as pancreatic resection with negative margins and ≥ 15 lymph nodes examined. Stage-specific GRT was defined by current National Comprehensive Cancer Network guidelines. Multivariable models were used to determine predictors of adherence to SAS and GRT and prognostic impact on overall survival.

RESULTS

Overall, SAS was achieved in 39% and GRT in 65% of patients, but only 30% received both SAS and GRT. Increasing age, minority race, uninsured status, and greater comorbidities were associated with a decreased odds of receiving both SAS and GRT (all p < 0.05). SAS (HR 0.79; CI 0.76-0.81; p < 0.001) and GRT (HR 0.67; CI 0.65-0.69; p < 0.001) were each independently associated with a survival advantage. Receipt of both SAS and GRT was associated with significant improvement in median OS compared with receiving neither (2.2 years vs 1.1 years; p < 0.001) which was independently associated with a 78% increased risk of death (HR 1.78; CI 1.70-1.86; p < 0.001).

CONCLUSIONS

Despite survival benefits associated with adherence to operative standards and receipt of guideline-recommended therapy, compliance remains poor. Future efforts must be directed toward improved education and implementation efforts around both operative standards and therapy guidelines.

Impact of Mediating and Confounding Variables on the Volume-Outcome Association in the Treatment of Pancreatic Cancer

BACKGROUND

High-volume centers (HVC), academic centers (AC), and longer travel distances (TD) have been associated with improved outcomes for patients undergoing surgery for pancreatic adenocarcinoma (PAC). Effects of mediating variables on these associations remain undefined. The purpose of this study is to examine the direct effects of hospital volume, facility type, and travel distance on overall survival (OS) in patients undergoing surgery for PAC and characterize the indirect effects of patient-, disease-, and treatment-related mediating variables.

PATIENTS AND METHODS

Using the National Cancer Database, patients with non-metastatic PAC who underwent resection were stratified by annual hospital volume (< 11, 11-19, and ≥ 20 cases/year), facility type (AC versus non-AC), and TD (≥ 40 versus < 40 miles). Associations with survival were evaluated using multiple regression models. Effects of mediating variables were assessed using mediation analysis.

RESULTS

In total, 19,636 patients were included. Treatment at HVC or AC was associated with lower risk of death [hazard ratio (HR) 0.90, confidence interval (CI) 0.88-0.92; HR 0.89, CI 0.86-0.91, respectively]. TD did not impact OS. Patient-, disease-, and treatment-related variables explained 25.5% and 41.8% of the survival benefit attained from treatment at HVC and AC, reducing the survival benefit directly attributable to each variable to 4.9% and 6.4%, respectively.

CONCLUSIONS

Treatment of PAC at HVC and AC was associated with improved OS, but the magnitude of this benefit was less when mediating variables were considered. From a healthcare utilization and cost-resource perspective, further research is needed to identify patients who would benefit most from selective referral to HVC or AC.

Outcomes of Partial Versus Total Colectomy in Ulcerative Colitis: A Propensity Score-Matched Analysis

INTRODUCTION

Total abdominal colectomy (TAC) with ileostomy is the standard treatment for severe ulcerative colitis (UC). Partial colectomy (PC) with colostomy may present a less morbid treatment option.

METHODS

The 2012-19 ACS-NSQIP database was queried to assess 30-day outcomes among patients undergoing TAC versus PC for UC, utilizing propensity score matching (PSM) techniques to account for differences in disease severity, patient selection, and presentation acuity.

RESULTS

Before matching (n = 9888), patients undergoing PC were older, had more comorbidities, and experienced higher complication and 30-day mortality rates (P < 0.001). After matching (n = 1846), patients undergoing TAC experienced higher 30-day overall complications (41.9% versus 36.5%, P = 0.017) and serious complications (37.2% versus 31.5%, P = 0.011). Sensitivity analyses of older patients and those undergoing nonemergency surgery demonstrated higher overall rates of complications for patients receiving TAC. However, among patients undergoing emergency surgery only, no differences in complications were seen between the two surgical approaches.

CONCLUSIONS

PC with colostomy in the setting of ulcerative colitis has similar 30-day outcomes to TAC with ileostomy. PC may be an acceptable surgical alternative to TAC in select patients. Studies investigating longer-term outcomes are necessary to further investigate this option.

Tumor infiltrating lymphocytes as an endpoint in cancer vaccine trials

Checkpoint inhibitors have invigorated cancer immunotherapy research, including cancer vaccination. Classic early phase trial design and endpoints used in developing chemotherapy are not suited for evaluating all forms of cancer treatment. Peripheral T cell response dynamics have demonstrated inconsistency in assessing the efficacy of cancer vaccination. Tumor infiltrating lymphocytes (TILs), reflect the local tumor microenvironment and may prove a superior endpoint in cancer vaccination trials. Cancer vaccines may also promote success in combination immunotherapy treatment of weakly immunogenic tumors. This review explores the impact of TILs as an endpoint for cancer vaccination in multiple malignancies, summarizes the current literature regarding TILs analysis, and discusses the challenges of providing validity and a standardized implementation of this approach.

Divergent clinical outcomes in a phase 2B trial of the TLPLDC vaccine in preventing melanoma recurrence and the impact of dendritic cell collection methodology: a randomized clinical trial

BACKGROUND

A randomized, double-blind, placebo-controlled phase 2b trial of the tumor lysate, particle-loaded, dendritic cell (TLPLDC) vaccine was conducted in patients with resected stage III/IV melanoma. Dendritic cells (DCs) were harvested with and without granulocyte-colony stimulating factor (G-CSF). This analysis investigates differences in clinical outcomes and RNA gene expression between DC harvest methods.

METHODS

The TLPLDC vaccine is created by loading autologous tumor lysate into yeast cell wall particles (YCWPs) and exposing them to phagocytosis by DCs. For DC harvest, patients had a direct blood draw or were pretreated with G-CSF before blood draw. Patients were randomized 2:1 to receive TLPLDC or placebo. Differences in disease-free survival (DFS) and overall survival (OS) were evaluated. RNA-seq analysis was performed on the total RNA of TLPLDC + G and TLPLDC vaccines to compare gene expression between groups.

RESULTS

144 patients were randomized: 103 TLPLDC (47 TLPLDC/56 TLPLDC + G) and 41 placebo (19 placebo/22 placebo + G). Median follow-up was 27.0 months. Both 36-month DFS (55.8% vs. 24.4% vs. 30.0%, p = 0.010) and OS (94.2% vs. 69.8% vs. 70.9%, p = 0.024) were improved in TLPLDC compared to TLPLDC + G or placebo, respectively. When compared to TLPLDC + G vaccine, RNA-seq from TLPLDC vaccine showed upregulation of genes associated with DC maturation and downregulation of genes associated with DC suppression or immaturity.

CONCLUSIONS

Patients receiving TLPLDC vaccine without G-CSF had improved OS and DFS. Outcomes remained similar between patients receiving TLPLDC + G and placebo. Direct DC harvest without G-CSF had higher expression of genes linked to DC maturation, likely improving clinical efficacy.

Meeting the New Commission on Cancer Operative Standards: Where Do We Stand Now?

INTRODUCTION

The 2020 Commission on Cancer accreditation standards 5.7 and 5.8 address total mesorectal excision for rectal cancer and lymph node sampling for lung cancer. The purpose of this review was to assess our institution's compliance with these operative standards, which will be required in 2022 and 2023, and provide recommendations to other military training facilities seeking to comply with these standards.

MATERIALS AND METHODS

A 2018-2020 single institution chart review was performed of operative and pathology reports. Identified deficits were addressed in meetings with colorectal and thoracic surgery leadership, and cases were followed to reassess compliance.

RESULTS

A total of 12 rectal and 48 lung cancer cases met the inclusion criteria and were examined. Pre-intervention compliance for standards 5.7 and 5.8 was 58% and 35%, respectively, because of inadequate synoptic reporting and lymph node sampling. After intervention, compliance was 100%.

CONCLUSIONS

Our institution requires changes to comply with new standards, including in areas of documentation and systematic pulmonary lymph node sampling. We provide lessons learned from our own institutional experience, including practical tips and recommendations to achieve compliance. All military training facilities performing lung and rectal oncologic resections should conduct an internal review of applicable cases in preparation for upcoming American College of Surgeons Commission on Cancer site visits.

Downstaging of Pancreatic Adenocarcinoma With Either Neoadjuvant Chemotherapy or Chemoradiotherapy Improves Survival

BACKGROUND

Neoadjuvant chemotherapy (NAC) or chemoradiation (NAC+XRT) is incorporated into the treatment of localized pancreatic adenocarcinoma (PDAC), often with the goal of downstaging before resection. However, the effect of downstaging on overall survival, particularly the differential effects of NAC and NAC+XRT, remains undefined. This study examined the impact of downstaging from NAC and NAC+XRT on overall survival.

METHODS

The National Cancer Data Base (NCDB) was queried from 2006 to 2015 for patients with non-metastatic PDAC who received NAC or NAC+XRT. Rates of overall and nodal downstaging, and pathologic complete response (pCR) were assessed. Predictors of downstaging were evaluated using multivariable logistic regression. Overall survival (OS) was assessed with Kaplan-Meier and Cox proportional hazards modeling.

RESULTS

The study enrolled 2475 patients (975 NAC and 1500 NAC+XRT patients). Compared with NAC, NAC+XRT was associated with higher rates of overall downstaging (38.3 % vs 23.6 %; p ≤ 0.001), nodal downstaging (16.0 % vs 7.8 %; p ≤ 0.001), and pCR (1.7 % vs 0.7 %; p = 0.041). Receipt of NAC+XRT was independently predictive of overall (odds ratio [OR] 2.28; p < 0.001) and nodal (OR 3.09; p < 0.001) downstaging. Downstaging by either method was associated with improved 5-year OS (30.5 vs 25.2 months; p ≤ 0.001). Downstaging with NAC was associated with an 8-month increase in median OS (33.7 vs 25.6 months; p = 0.005), and downstaging by NAC+XRT was associated with a 5-month increase in median OS (30.0 vs 25.0 months; p = 0.008). Cox regression showed an association of overall downstaging with an 18 % reduction in the risk of death (hazard ratio [HR] 0.82; 95 % confidence interval, 0.71-0.95; p = 0.01) CONCLUSION: Downstaging after neoadjuvant therapies improves survival. The addition of radiation therapy may increase the rate of downstaging without affecting overall oncologic outcomes.

Immunologic and dose dependent effects of rapamycin and its evolving role in chemoprevention

Rapamycin inhibits the mechanistic (formally mammalian) target of rapamycin (mTOR), an evolutionarily conserved intracellular kinase that influences activation of growth signaling pathways and immune responses to malignancy. Rapamycin has been found to have both immunosuppressant and immunostimulatory effects throughout the innate and adaptive responses based on the inhibition of mTOR signaling. While the immunosuppressant properties of rapamycin and mTOR inhibition explain rapamycin's success in the prevention of transplant rejection, the immunostimulatory characteristics are likely partially responsible for rapamycin's anti-neoplastic effects. The immunologic response to rapamycin is at least partially dependent on the dose and administration schedule, with lower doses inducing immunostimulation and intermittent dosing promoting immune function while limiting metabolic and immunosuppressant toxicities. In addition to its FDA-approved application in advanced malignancies, rapamycin may be effective as a chemopreventive agent, suspending progression of low-grade cancers, preventing invasive conversion of in situ malignancy, or delaying malignant transformation of established pre-malignant conditions.

Surgical Society Podcasts: A Novel Way to Engage and Educate the Community

BACKGROUND

Podcasts are increasingly being utilized in the surgical field as an asynchronous educational resource. This article discusses podcasts devoted to the field of surgery and their growing contribution to surgical education.

METHODS

We provide examples of current podcasts and their varied structures, including those that distribute clinical and educational content, discuss recent literature and advancements, interview leaders in the field, and/or showcase unique perspectives on topics such as career development, diversity, and wellness.

RESULTS AND CONCLUSIONS

Podcasts generated from surgical societies stand on unique ground to educate and engage the surgical community.

Maximizing Benefit of Virtual Learning: Lessons from the COVID-19 Pandemic

Introduction

The coronavirus disease 2019 pandemic has profoundly impacted surgical education. We assessed resident perceptions of our virtual academic program, which consists of daily lectures or case conferences held via a videoconferencing platform.

Methods

A survey evaluating attitudes and practices for virtual academics was administered to general surgery residents. A focus group was conducted to identify benefits, barriers to engagement, and opportunities for improvement for virtual education. A total of 19 residents completed the education survey, and seven residents participated in the focus group.

Results

While expressing preference toward in-person academics (84.2%), residents felt the virtual academics were of good quality (median rating 4/5) and preferred virtual academics to no academic sessions (94.7%). Of respondents, 57.9% believe that the coronavirus pandemic negatively impacted their surgical education. They believe their American Board of Surgery In-Training Examination preparation was not impacted. Residents preferred using a computer over a phone for academics (79% versus 16%). The focus group identified the benefits of virtual academics, including the ability to participate while away and having recordings available. Areas for improvement included reinforcement of protected time for academics, requiring cameras be on, increasing in-lecture polls, and creation of an online repository of recordings for review. Residents hoped a virtual component of academics and recordings would continue past the pandemic.

Conclusions

Although virtual academics are not the preferred mode of learning in our residency, there are multiple unintended benefits. We recommend a hybrid academic model with in-person didactics and recorded video for later review.

Advancing COVID-19 Vaccination Equity Among the Refugee Community: An Innovative Multi-Sector Collaborative Outreach Program

INTRODUCTION

Multi-sector outreach collaborations have the potential to improve COVID-19 vaccine access among underserved populations, including refugees.

METHODS

Using a four-pronged strategy, we offered the local refugee community COVID-19 vaccine appointments within the next week.

RESULTS

Over a thousand (1,327) individuals from more than 20 countries were identified; mean age 36.5 (SD=16.4); 55% female. Initially, 613 (46%) reported being scheduled/vaccinated prior to outreach efforts; 312 (24%) appointments were scheduled that resulted from outreach efforts. By February 2022, 895 (67.4%) of the 1,327 patients had at least one dose; the majority of these were Pfizer (n=750, 84%). Of 895 with first dose, 843 completed two-dose series (94.2%). Overall completion rate of initial series was 63.5%. Reasons for declining (171, 13%) included wanting to speak with a physician or family member first; pregnancy hesitation; postponing until after Ramadan.

DISCUSSION

Although lower than local and state rates, this refugee community's COVID-19 vaccine uptake is on par with the overall population in the United States (65.8%). Because of COVID-19's disproportionately negative impact on refugee and other underserved populations, we offer recommendations for future equity-informed efforts.

Using an interprofessional team to provide refugee healthcare in an academic medical centre

Introduction

The International Family Medicine Clinic (IFMC) was established in 2002 by the University of Virginia Department of Family Medicine to provide comprehensive, timely, culturally sensitive and high-quality healthcare to the growing refugee and special immigrant population in Central Virginia, USA.

Methods

The purpose of this paper is to describe the IFMC, with a specific focus on interprofessional roles, interprofessional collaboration, community partnerships and the services and resources available to IFMC patients.

Results

The clinic has served over 3100 refugees from 60 countries in its 16-year history. In 2019, the clinic staff now includes 4 attending physicians, 2 nurse practitioners and 14 residents who have dedicated clinic time to see refugees; a registered nurse care coordinator and a social worker dedicated to the IFMC refugee population; 2 clinical psychologists and doctoral students in clinical psychology; and a clinical pharmacist. The IFMC also provides onsite psychiatric care. A process flow map depicts the interconnectivity of interprofessional team members working together with other specialty care providers within the medical centre and with community partners on behalf of refugee patients through the resettlement process.

Conclusion

Individuals who arrive in the USA as refugees are a particularly vulnerable patient group and often require an interprofessional team approach. The IFMC may serve as a model for other institutions interested in starting a similar interprofessional, refugee-centred medical home.

Skeletal Muscle in Healthy Subjects versus Those with GNE-Related Myopathy: Evaluation with Shear-Wave US--A Pilot Study

PURPOSE

To determine whether quantitative differences in shear-wave velocity (SWV) exist between normal skeletal muscle and those affected by GNE-related myopathy and to examine the effects of muscle anisotropy, depth, and axial preload on SWV in a healthy control group.

MATERIALS AND METHODS

This study was approved by the institutional review board and compliant with HIPAA. Informed consent was obtained from all study volunteers. Eight patients (four women and four men aged 30-50 years) with genetically and biopsy-proved GNE-related myopathy and five healthy volunteers (three women and two men aged 27-33 years) underwent SWV imaging with use of a 9-MHz linear transducer. The gastrocnemius muscles were evaluated in the patients with GNE-related myopathy, and the gastrocnemius, vastus lateralis, and rectus femoris muscles were evaluated in the healthy cohort. The effect of muscle anisotropy, axial preload, and sample volume depth were examined in the healthy cohort. The effect of anisotropy at a fixed depth and preload were examined in the patients with GNE-related myopathy.

RESULTS

Irrespective of the muscle, the mean SWV was significantly higher with the transverse orientation than with the longitudinal orientation (P < .001). In the healthy cohort, the mean SWV for superficial measurements was significantly lower than that for deep measurements (P < .02). The mean SWV with preload was significantly higher with compression (P < .001) for the rectus femoris only. The mean SWV was significantly lower in patients with GNE-related myopathy than in control subjects (P < .02).

CONCLUSION

SWV parametric imaging may provide a useful quantitative adjunct in the assessment of disease activity in patients with GNE-related myopathy. There is diminished SWV and muscle anisotropy in GNE-related myopathy.

Antibody targeting of anaplastic lymphoma kinase induces cytotoxicity of human neuroblastoma

Anaplastic lymphoma kinase (ALK) is a receptor tyrosine kinase aberrantly expressed in neuroblastoma, a devastating pediatric cancer of the sympathetic nervous system. Germline and somatically acquired ALK aberrations induce increased autophosphorylation, constitutive ALK activation and increased downstream signaling. Thus, ALK is a tractable therapeutic target in neuroblastoma, likely to be susceptible to both small-molecule tyrosine kinase inhibitors and therapeutic antibodies-as has been shown for other receptor tyrosine kinases in malignancies such as breast and lung cancer. Small-molecule inhibitors of ALK are currently being studied in the clinic, but common ALK mutations in neuroblastoma appear to show de novo insensitivity, arguing that complementary therapeutic approaches must be developed. We therefore hypothesized that antibody targeting of ALK may be a relevant strategy for the majority of neuroblastoma patients likely to have ALK-positive tumors. We show here that an antagonistic ALK antibody inhibits cell growth and induces in vitro antibody-dependent cellular cytotoxicity of human neuroblastoma-derived cell lines. Cytotoxicity was induced in cell lines harboring either wild type or mutated forms of ALK. Treatment of neuroblastoma cells with the dual Met/ALK inhibitor crizotinib sensitized cells to antibody-induced growth inhibition by promoting cell surface accumulation of ALK and thus increasing the accessibility of antigen for antibody binding. These data support the concept of ALK-targeted immunotherapy as a highly promising therapeutic strategy for neuroblastomas with mutated or wild-type ALK.