Pick Topic
Review Topic
List Experts
Examine Expert
Save Expert
  Site Guide ··   
Pancreatic Neoplasms: HELP
Articles by Douglas S. Tyler
Based on 13 articles published since 2009
(Why 13 articles?)

Between 2009 and 2019, Douglas Tyler wrote the following 13 articles about Pancreatic Neoplasms.
+ Citations + Abstracts
1 Guideline Pancreatic adenocarcinoma. 2010

Tempero, Margaret A / Arnoletti, J Pablo / Behrman, Stephen / Ben-Josef, Edgar / Benson, Al B / Berlin, Jordan D / Cameron, John L / Casper, Ephraim S / Cohen, Steven J / Duff, Michelle / Ellenhorn, Joshua D I / Hawkins, William G / Hoffman, John P / Kuvshinoff, Boris W / Malafa, Mokenge P / Muscarella, Peter / Nakakura, Eric K / Sasson, Aaron R / Thayer, Sarah P / Tyler, Douglas S / Warren, Robert S / Whiting, Samuel / Willett, Christopher / Wolff, Robert A / Anonymous3820673. · ·J Natl Compr Canc Netw · Pubmed #20876541.

ABSTRACT: -- No abstract --

2 Article Minimally Invasive Pancreaticoduodenectomy Does Not Improve Use or Time to Initiation of Adjuvant Chemotherapy for Patients With Pancreatic Adenocarcinoma. 2016

Nussbaum, Daniel P / Adam, Mohamed A / Youngwirth, Linda M / Ganapathi, Asvin M / Roman, Sanziana A / Tyler, Douglas S / Sosa, Julie A / Blazer, Dan G. ·Department of Surgery, Duke University, Durham, NC, USA. daniel.nussbaum@duke.edu. · Department of Surgery, Duke University, Durham, NC, USA. · Department of Surgery, The University of Texas Medical Branch, Galveston, TX, USA. ·Ann Surg Oncol · Pubmed #26542590.

ABSTRACT: BACKGROUND: The modifiable variable best proven to improve survival after resection of pancreatic adenocarcinoma is the addition of adjuvant chemotherapy. A theoretical advantage of minimally invasive pancreaticoduodenectomy (MI-PD) is the potential for greater use and earlier initiation of adjuvant therapy, but this benefit remains unproven. METHODS: The 2010-2012 National Cancer Data Base (NCDB) was queried for patients undergoing pancreaticoduodenectomy for pancreatic adenocarcinoma. Subjects were classified as MI-PD versus open pancreaticoduodenectomy (O-PD). Baseline variables were compared between groups. The independent effect of surgical approach on the use and timing of adjuvant chemotherapy was estimated using multivariable regression analyses. RESULTS: For this study, 7967 subjects were identified: 1191 MI-PD (14.9%) and 6776 O-PD (85.1%) patients. Patients who underwent MI-PD were more likely to have been treated at academic hospitals. Otherwise, the groups had no baseline differences. In both the MI-PD and O-PD groups, approximately 50% of the patients received adjuvant chemotherapy, initiated at a median of 54 versus 55 days postoperatively (p = 0.08). After multivariable adjustment, surgical approach was not independently associated with use (odds ratio 1.00; p = 0.99) or time to initiation of adjuvant chemotherapy (-2.3 days; p = 0.07). Younger age, insured status, lower comorbidity score, higher tumor stage, and the presence of lymph node metastases were independently associated with the use of adjuvant chemotherapy. CONCLUSIONS: At a national level, MI-PD does not result in greater use or earlier initiation of adjuvant chemotherapy. As surgeons and institutions continue to gain experience with this complex procedure, it will be important to revisit this benchmark as a justification for its increasing use for patients with pancreatic cancer.

3 Article Feeding jejunostomy tube placement in patients undergoing pancreaticoduodenectomy: an ongoing dilemma. 2014

Nussbaum, Daniel P / Zani, Sabino / Penne, Kara / Speicher, Paul J / Stinnett, Sandra S / Clary, Bryan M / White, Rebekah R / Tyler, Douglas S / Blazer, Dan G. ·Department of Surgery, Duke University Medical Center, Box 3443, Durham, NC, 27710, USA, daniel.nussbaum@duke.edu. ·J Gastrointest Surg · Pubmed #24961442.

ABSTRACT: BACKGROUND: Concomitant placement of feeding jejunostomy tubes (FJT) during pancreaticoduodenectomy is common, yet there are limited data regarding catheter-specific morbidity and associated outcomes. This information is crucial to appropriately select patients for feeding tube placement and to optimize perioperative nutrition strategies. METHODS: A review of all patients undergoing pancreaticoduodenectomy with FJT placement was completed. Patients were grouped by the occurrence of FJT-related morbidity. Multivariable logistic regression was performed to identify predictors of FJT morbidity; these complications were then further defined. Finally, associated postoperative outcomes were compared between groups. RESULTS: In total, 126 patients were included, of which 18 (14 %) had complications directly related to their FJT, including pericatheter infection (n = 6), pneumatosis intestinalis (n = 4), severe tube feed intolerance (n = 3), and primary catheter malfunction (n = 7). Following adjustment with logistic regression, preoperative hypoalbuminemia was identified as the only independent predictor of FJT complications (OR 2.23, p = 0.035). Patients with FJT complications were more likely to be initiated on total parenteral nutrition (TPN; 55.6 vs. 7.4 %, p -0.035) and to require TPN at discharge (16.7 vs. 0%, p = 0.003). Correspondingly, these patients resumed an oral diet later (14 vs. 8 days, p = 0.06). Both reoperation (50.0 vs. 6.5%, p < 0.001) and readmission (50.0 vs. 22.4%, p = 0.041) rates were higher among patients with FJT complications. CONCLUSIONS: FJT-related morbidity is common among patients undergoing pancreaticoduodenectomy and is associated with inferior outcomes and other performance metrics. Preoperative malnutrition appears to predict FJT complications, creating an ongoing dilemma regarding FJT placement. In the future, it will be important to better define criteria for FJT placement during pancreaticoduodenectomy.

4 Article Defining the learning curve for team-based laparoscopic pancreaticoduodenectomy. 2014

Speicher, Paul J / Nussbaum, Daniel P / White, Rebekah R / Zani, Sabino / Mosca, Paul J / Blazer, Dan G / Clary, Bryan M / Pappas, Theodore N / Tyler, Douglas S / Perez, Alexander. ·Department of Surgery, Duke University Medical Center, Durham, NC, USA, paul.speicher@duke.edu. ·Ann Surg Oncol · Pubmed #24923222.

ABSTRACT: BACKGROUND: The purpose of this study was to define the learning curves for laparoscopic pancreaticoduodenectomy (LPD) with and without laparoscopic reconstruction, using paired surgical teams consisting of advanced laparoscopic-trained surgeons and advanced oncologic-trained surgeons. METHODS: All patients undergoing PD without vein resection at a single institution were retrospectively analyzed. LPD was introduced by initially focusing on laparoscopic resection followed by open reconstruction (hybrid) for 18 months prior to attempting a totally LPD (TLPD) approach. Cases were compared with Chi square, Fisher's exact test, and Kruskal-Wallis analysis of variance (ANOVA). RESULTS: Between March 2010 and June 2013, 140 PDs were completed at our institution, of which 56 (40 %) were attempted laparoscopically. In 31/56 procedures we planned to perform only the resection laparoscopically (hybrid), of which 7 (23 %) required premature conversion before completion of resection. Following the first 23 of these hybrid cases, a total of 25 TLPDs have been performed, of which there were no conversions to open. For all LPD, a significant reduction in operative times was identified following the first 10 patients (median 478.5 vs. 430.5 min; p = 0.01), approaching open PD levels. After approximately 50 cases, operative times and estimated blood loss were consistently lower than those for open PD. CONCLUSIONS: In our experience of building an LPD program, the initial ten cases represent the biggest hurdle with respect to operative times. For an experienced teaching center using a staged and team-based approach, LPD appears to offer meaningful reductions in operative time and blood loss within the first 50 cases.

5 Article The impact of vascular resection on early postoperative outcomes after pancreaticoduodenectomy: an analysis of the American College of Surgeons National Surgical Quality Improvement Program database. 2012

Castleberry, Anthony W / White, Rebekah R / De La Fuente, Sebastian G / Clary, Bryan M / Blazer, Dan G / McCann, Richard L / Pappas, Theodore N / Tyler, Douglas S / Scarborough, John E. ·Department of Surgery, Duke University Medical Center, Durham, NC, USA. anthony.castleberry@duke.edu ·Ann Surg Oncol · Pubmed #22932857.

ABSTRACT: BACKGROUND: Several single-center reports suggest that vascular resection (VR) during pancreaticoduodenectomy (PD) for patients with pancreatic adenocarcinoma is feasible without affecting early postoperative mortality or morbidity. Our objective is to review the outcomes associated with VR during PD using a large multicenter data source. METHODS: A retrospective cohort analysis was performed using the National Surgical Quality Improvement Program Participant User Files for 2005-2009. All patients undergoing PD for a postoperative diagnosis of malignant neoplasm of the pancreas were included. Forward stepwise multivariate regression analysis was used to determine the association between VR during PD and 30-day postoperative mortality and morbidity after adjustment for patient demographics and comorbidities. RESULTS: 3,582 patients were included for analysis, 281 (7.8 %) of whom underwent VR during PD. VR during PD was associated with significantly greater risk-adjusted 30-day postoperative mortality [5.7 % with VR versus 2.9 % without VR, adjusted odds ratio (AOR) 2.1, 95 % confidence interval (CI) 1.22-3.73, P = 0.008] and overall morbidity (39.9 % with VR versus 33.3 % without VR, AOR 1.36, 95 % CI 1.05-1.75, P = 0.02). There was no significant difference in risk-adjusted postoperative mortality or morbidity between those patients undergoing VR by the primary surgical team versus those patients undergoing VR by a vascular surgical team. CONCLUSIONS: Contrary to the findings of several previously published single-center analyses, the current study demonstrates increased 30-day postoperative morbidity and mortality in PD with VR when compared with PD alone.

6 Article Does preoperative therapy optimize outcomes in patients with resectable pancreatic cancer? 2012

Papalezova, Katia T / Tyler, Douglas S / Blazer, Dan G / Clary, Bryan M / Czito, Brian G / Hurwitz, Herbert I / Uronis, Hope E / Pappas, Theodore N / Willett, Christopher G / White, Rebekah R. ·Department of Surgery, Montefiore Medical Center, Bronx, NY, USA. kpapalez@montefiore.org ·J Surg Oncol · Pubmed #22311829.

ABSTRACT: The objective of this study was to compare survival between all patients with radiographically resectable adenocarcinoma of the proximal pancreas who underwent preoperative chemoradiation therapy (PRE-OP CRT) or surgical exploration first (SURGERY) with "intention to resect." Pancreatic cancer patients who undergo resection after PREOP CRT live longer than patients who undergo resection without PREOP CRT, a difference that may be attributable to patient selection. We retrospectively identified 236 patients with pancreatic head adenocarcinoma seen between 1999 and 2007 with sufficient data to be confirmed medically and radiographically resectable. The outcomes of 144 patients who underwent PREOP CRT were compared to those of 92 patients who proceeded straight to SURGERY. The groups were similar in age and gender. Tumors were slightly larger in the PREOP CRT group (mean 2.5 cm vs. 2.1 cm, P < 0.01), and there were trends toward more venous abutment (54% vs. 39%, P = 0.06) and a higher Charlson comorbidity index (P = 0.1). In the PREOP CRT group, 76 patients (53%) underwent resection, 28 (19%) had metastatic and 17 (12%) locally unresectable disease after PREOP CRT, and 23 (16%) were not explored due to performance status or loss to follow-up. In the SURGERY group, 68 patients (74%) underwent resection. Sixteen patients (17%) had metastatic and eight patients (9%) locally unresectable disease at exploration. In patients who underwent resection, the PREOP CRT group had smaller pathologic tumor size and lower incidence of positive lymph nodes than the SURGERY group but no difference in positive margins or need for vascular resection. Median overall survival (OS) in patients undergoing resection was 27 months in the PREOP CRT group and 17 months in the SURGERY group (P = 0.04). Median OS in all patients treated with PREOP CRT or surgically explored with intention to resect was 15 and 13 months, respectively, with superimposable survival curves. Despite a lower resection rate, the PREOP CRT group as a whole had a similar OS to the SURGERY group as a whole. For patients who underwent resection, those in the PREOP CRT had longer survival than those in the SURGERY group, suggesting that PREOP CRT allows better patient selection for resection. PREOP CRT should be considered an acceptable alternative for most patients with resectable pancreatic cancer.

7 Article Vascular surgery collaboration during pancreaticoduodenectomy with vascular reconstruction. 2012

Turley, Ryan S / Peterson, Kirk / Barbas, Andrew S / Ceppa, Eugene P / Paulson, Erik K / Blazer, Dan G / Clary, Bryan M / Pappas, Theodore N / Tyler, Douglas S / McCann, Richard L / White, Rebekah R. ·Department of Surgery, Duke University, Durham, NC 27710, USA. ·Ann Vasc Surg · Pubmed #22305864.

ABSTRACT: BACKGROUND: Once thought to have unresectable disease, pancreatic cancer patients with portal venous involvement are now reported to have comparable survival after pancreaticoduodenectomy (PD) with vascular reconstruction (VR) as compared with patients without vascular involvement. We hypothesize that a multidisciplinary approach involving a vascular surgeon will minimize morbidity and improve patency of VRs. METHODS: We identified 204 patients who underwent PD for pancreatic adenocarcinoma from 1997 to 2008. Patients who underwent PD with VR (N = 42) were compared with those who underwent standard PD (N = 162). VRs were performed by a vascular surgeon and involved primary repair (N = 8), vein patch (N = 25), or interposition grafting (N = 9) with femoral or other venous conduit. RESULTS: Patients undergoing PD with VR had larger tumors (3.0 cm vs. 2.5 cm, P < 0.01) but did not have different rates of tumor-free margins (73% vs. 72%, P = 0.84) or lymph nodes metastases (50% vs. 38%, P = 0.14). The VR group had higher median blood loss (875 mL vs. 550 mL, P = 0<0.01), but no differences in mortality, complication rates, length of stay, or readmission rates were found in a median follow-up of 29 months. Overall survival rates were similar. Predictors of mortality on multivariate analysis included increasing histological grade (P = 0.01), positive lymph nodes (P = 0.01), and increasing tumor size (P = 0.01), but not VR (P = 0.28). When evaluated by computed tomography scans within 6 months postoperatively, 97% of reconstructions remained patent. CONCLUSIONS: The need for VR is not a contraindication to potentially curative resection in patients with pancreatic adenocarcinoma. Assistance of a vascular surgeon during VR may allow moderate-volume centers to achieve outcomes comparable with high-volume centers.

8 Article Resected pancreatic neuroendocrine tumors: patterns of failure and disease-related outcomes with or without radiotherapy. 2012

Zagar, Timothy M / White, Rebekah R / Willett, Christopher G / Tyler, Douglas S / Papavassiliou, Paulie / Papalezova, Katia T / Guy, Cynthia D / Broadwater, Gloria / Clough, Robert W / Czito, Brian G. ·Department of Radiation Oncology, University of North Carolina, Chapel Hill, NC, USA. ·Int J Radiat Oncol Biol Phys · Pubmed #22270161.

ABSTRACT: PURPOSE: Pancreatic neuroendocrine tumors (NET) are rare and have better disease-related outcomes compared with pancreatic adenocarcinoma. Surgical resection remains the standard of care, although many patients present with locally advanced or metastatic disease. Little is known regarding the use of radiotherapy in the prevention of local recurrence after resection. To better define the role of radiotherapy, we performed an analysis of resected patients at our institution. METHODS: Between 1994 and 2009, 33 patients with NET of the pancreatic head and neck underwent treatment with curative intent at Duke University Medical Center. Sixteen patients were treated with surgical resection alone while an additional 17 underwent resection with adjuvant or neoadjuvant radiation therapy, usually with concurrent fluoropyrimidine-based chemotherapy (CMT). Median radiation dose was 50.4 Gy and median follow-up 28 months. RESULTS: Thirteen patients (39%) experienced treatment failure. Eleven of the initial failures were distant, one was local only and one was local and distant. Two-year overall survival was 77% for all patients. Two-year local control for all patients was 87%: 85% for the CMT group and 90% for the surgery alone group (p = 0.38). Two-year distant metastasis-free survival was 56% for all patients: 46% and 69% for the CMT and surgery patients, respectively (p = 0.10). CONCLUSIONS: The primary mode of failure is distant which often results in mortality, with local failure occurring much less commonly. The role of radiotherapy in the adjuvant management of NET remains unclear.

9 Article Comparison of outcomes and the use of multimodality therapy in young and elderly people undergoing surgical resection of pancreatic cancer. 2012

Barbas, Andrew S / Turley, Ryan S / Ceppa, Eugene P / Reddy, Srinevas K / Blazer, Dan G / Clary, Bryan M / Pappas, Theodore N / Tyler, Douglas S / White, Rebekah R / Lagoo, Sandhya A. ·Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA. andrew.barbas@duke.edu ·J Am Geriatr Soc · Pubmed #22211710.

ABSTRACT: OBJECTIVES: To compare outcomes and the use of multimodality therapy in young and elderly people with pancreatic cancer undergoing surgical resection. DESIGN: Retrospective, single-institution study. SETTING: National Cancer Institute/National Comprehensive Cancer Network cancer center. PARTICIPANTS: Two hundred three individuals who underwent pancreaticoduodenectomy for pancreatic adenocarcinoma at Duke University Medical Center comprised the study population. Participants were divided into three groups based on age (<65, n = 97; 65-74, n = 74; ≥75, N = 32). MEASUREMENTS: Perioperative outcomes, the use of multimodality therapy, and overall survival of the different age groups were compared. RESULTS: Similar rates of perioperative mortality and morbidity were observed in all age groups, but elderly adults were more likely to be discharged to a rehabilitation or skilled nursing facility. A similar proportion of participants received neoadjuvant therapy, but a smaller proportion of elderly participants received adjuvant therapy. Overall survival was similar between the age groups. Predictors of poorer overall survival included coronary artery disease, positive resection margin, and less-differentiated tumor histology. Treatment with neoadjuvant and adjuvant therapy were predictors of better overall survival. CONCLUSION: Carefully selected elderly individuals experience similar perioperative outcomes and overall survival to those of younger individuals after resection of pancreatic cancer. There appears to be a significant disparity in the use of adjuvant therapy between young and elderly individuals.

10 Article Incidence of benign disease in patients that underwent resection for presumed pancreatic cancer diagnosed by endoscopic ultrasonography (EUS) and fine-needle aspiration (FNA). 2010

de la Fuente, Sebastian G / Ceppa, Eugene P / Reddy, Srinevas K / Clary, Bryan M / Tyler, Douglas S / Pappas, Theodore N. ·Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA. delaf002@mc.duke.edu ·J Gastrointest Surg · Pubmed #20424928.

ABSTRACT: INTRODUCTION: The lack of accurate markers makes preoperative differentiation between pancreatic cancer and non-malignant head lesions clinically challenging. In this study, we investigated the incidence of benign disease in patients that underwent resection for presumed pancreatic cancer diagnosed by EUS and EUS-guided FNA. METHODS: Medical records of consecutive patients who underwent pancreaticoduodenectomy at Duke University were reviewed. Demographics, clinicopathologic characteristics, preoperative imaging, EUS, EUS-guided FNA, and postoperative outcomes were analyzed. RESULTS: Seven percent of the total 494 patients studied were found to have benign disease on postoperative pathology. Fifty-nine percent of these patients with benign disease underwent preoperative EUS. EUS was positive for a head mass in 70%, demonstrated enlarged lymph nodes in 27%, and showed signs concerning for vascular invasion in 13%. FNA was suspicious or indeterminate for cancer in 63% of patients. Postoperative complications occurred in 47% and one patient died after surgery. The overall pancreatic leak rate was 15%. CONCLUSIONS: Even with aggressive use of preoperative evaluation, there is still a small subset of patients where malignancy cannot be excluded without pancreaticoduodenectomy.

11 Article Synthesis of 4'-ester analogs of resveratrol and their evaluation in malignant melanoma and pancreatic cell lines. 2010

Wong, Yong / Osmond, Gregory / Brewer, Kenneth I / Tyler, Douglas S / Andrus, Merritt B. ·Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, UT 84602, USA. ·Bioorg Med Chem Lett · Pubmed #20022501.

ABSTRACT: 4'-Ester analogs of the disease preventative agent resveratrol were synthesized and evaluated for their potential as anti-melanoma and pancreatic cancer agents. A decarbonylative Heck coupling was used to assemble the protected stilbene core structure. The 4'-acetate and the palmitoate analogs demonstrated selective activity with DM443 and DM738 cells over normal NHDF cells.

12 Article Defining criteria for selective operative management of pancreatic cystic lesions: does size really matter? 2010

Ceppa, Eugene P / De la Fuente, Sebastian G / Reddy, Srinevas K / Stinnett, Sandra S / Clary, Bryan M / Tyler, Douglas S / Pappas, Theodore N / White, Rebekah R. ·Department of Surgery, Duke University Medical Center, P.O. Box 3247, Durham, NC 27710, USA. ·J Gastrointest Surg · Pubmed #19911240.

ABSTRACT: INTRODUCTION: Proposed criteria for resection of pancreatic cystic lesions have included symptoms, size (>3 cm), and suspicious features by endoscopic ultrasound (EUS). The objective of this study was to evaluate risk factors for malignancy in a large series of patients undergoing resection of suspected pancreatic cystic neoplasms. METHODS: Medical records of patients selected for resection of pancreatic cystic lesions at Duke University Medical Center from 2000 to 2008 were reviewed. Lesions with solid components on cross-sectional imaging were excluded. Malignancy was defined as invasive or in situ carcinoma. RESULTS: After review, 101 patients were confirmed to have undergone resection for suspected cystic neoplasms of the pancreas. Preoperative EUS was performed in 71 patients. Sixteen patients (16%) had malignant lesions (preoperative size 1.5-5.9 cm). There was no clear association between size and malignancy. Male gender, biliary ductal dilatation (BDD), pancreatic ductal dilatation (PDD), and suspicious cytology (but not age, symptoms, or size) were associated with increased risk of malignancy. When factors available for all patients were incorporated into a multivariate model, only BDD and PDD were independent risk factors for malignancy. Only one patient with malignancy had neither BDD nor PDD but did have solid components by EUS. CONCLUSIONS: In patients selected for resection, size was not an independent risk factor for malignancy. While size might be appropriate for stratification of asymptomatic patients with simple cysts, size should not be used as a selection criterion for patients who have cysts with solid components or with associated BDD or PDD.

13 Article Pretreatment assessment of resectable and borderline resectable pancreatic cancer: expert consensus statement by Callery et al. 2009

Choti, Michael A / Dixon, Elijah / Tyler, Douglas. ·The Johns Hopkins Hospital, Baltimore, MD, USA. mchoti@jhmi.edu ·Ann Surg Oncol · Pubmed #19390901.

ABSTRACT: -- No abstract --