
Natalie Kirilcuk, MD, FACS
Clinical Associate Professor, Surgery - General Surgery
Clinical Focus
- Cancer > GI Oncology
- Colon and Rectal Surgery (Specialty)
- Colorectal Neoplasms
- Inflammatory Bowel Diseases
- Colon and Rectal Surgery
Administrative Appointments
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Associate Program Director, General Surgery Training Program (2012 - Present)
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UBMD Medical Director - E3, Stanford Health Care (2014 - Present)
Professional Education
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Fellowship: Washington University in St Louis School of Medicine (2011) MO
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Medical Education: Stanford university School of Medicine (2005) CA
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Internship: Stanford Hospital and Clinics - Dept of Surgery (2006) CA
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Residency: Stanford Hospital and Clinics - Dept of Surgery (2010) CA
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Board Certification: American Board of Colon and Rectal Surgery, Colon and Rectal Surgery (2012)
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Board Certification: American Board of Surgery, General Surgery (2011)
Clinical Trials
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Efficacy and Safety of LifeSeal™ Kit for Colorectal Staple Line Sealing
Not Recruiting
LifeSeal™ Kit, surgical sealant designed for staple-line reinforcement that is applied over the anastomotic line to prevent bowel content leakage until full physiological function is restored. RATIONALE : Postoperative anastomotic leakage is one of the most devastating and feared complications in colorectal surgery. The risk of postoperative anastomotic leakage varies widely depending on the level of anastomosis while the risk is higher in low anastomosis. In order to best demonstrate the benefits of LifeSeal™ in providing staple line reinforcement and helping to reduce leaks, the study includes high risk anastomoses, defined as colorectal and coloanal anastomoses performed within 10 cm from the anal verge. STUDY DESIGN: This study is designed as a prospective, multi-center, multinational randomized, single-blind, double armed study PRIMARY OBJECTIVE: The primary objective of this study is to assess the efficacy and safety of LifeSeal™ Kit as measured by the change in overall anastomotic leak rates in subjects undergoing low anterior resection with an anastomosis below 10 cm from the anal verge, over the first 17 weeks after surgery. SECONDARY OBJECTIVES: The secondary objective of this study is to assess the incidence of post-operative leaks and additional benefits that could be related to the use of LifeSeal™ Kit such as reducing the severity and improving the outcome of a leak once it has occurred. In addition, the study will allow for collection and analysis of additional safety data and usability assessment of the device, medical resource utilization, and health related quality of life measures.
Stanford is currently not accepting patients for this trial. For more information, please contact Cancer Clinical Trials Office (CCTO), 650-498-7061.
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Molecular Genetic and Pathological Studies of Anal Tumors
Not Recruiting
Study the Genetics of Anal Cancer
Stanford is currently not accepting patients for this trial. For more information, please contact Moe Jalali, 650-724-4023.
All Publications
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Phase II trial of organ preservation program using short-course radiation and FOLFOXIRI for rectal cancer (SHORT-FOX): Two-Year primary outcome analysis.
Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology
2025; 207: 110884
Abstract
As patients with rectal cancer with clinical complete response (cCR) after neoadjuvant therapy may be safely spared Total Mesorectal Excision (TME), strategies to maximize cCR are needed.We conducted a single-arm phase II study to determine whether dose-escalated short-course radiotherapy (25 Gy/5 fractions + 5 Gy/1 fraction boost) followed by eight cycles of FOLFOXIRI increased cCR rates among adult patients with > T2N0M0 or low T2N0 rectal cancer.Between 2020 and 2023, we enrolled 37 patients, of whom 27 (73 %) had at least one high-risk feature (cT4, extramural vascular invasion [EMVI], N2, threatened circumferential resection margin, positive lateral node). At primary endpoint assessment, nine (24 %) patients had cCR on both endoscopy and MRI, and pursued organ preservation (OP). Fourteen (38 %) patients had cCR only on endoscopy, nine of whom pursued OP. Of the 18 patients who pursued OP, nine had local regrowth at two years from radiotherapy start, with two-year TME-free survival of 26 %. Baseline factors significantly associated with not achieving OP included age < 50 years and T4 disease. At mid-treatment restaging, patients who achieved OP were significantly less likely to have persistent node positivity, EMVI, and endoscopically visible tumor. Grade 3+ adverse events at least possibly attributed to chemotherapy and radiotherapy occured in 51% and 43% of patients, respectively.Short-course radiotherapy with a boost followed by FOLFIXIRI results in OP in one-quarter of patients with high-risk rectal cancer, with poorer response among younger patients and T4 disease. Mid-treatment response may help guide timely decision-making regarding treatment.
View details for DOI 10.1016/j.radonc.2025.110884
View details for PubMedID 40209856
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NCCN Guidelines Insights: Rectal Cancer, Version 3.2024.
Journal of the National Comprehensive Cancer Network : JNCCN
2024; 22 (6): 366-375
Abstract
The determination of an optimal treatment plan for an individual patient with rectal cancer is a complex process. In addition to decisions relating to the intent of rectal cancer surgery (ie, curative or palliative), consideration must also be given to the likely functional results of treatment, including the probability of maintaining or restoring normal bowel function/anal continence and preserving genitourinary functions. Particularly for patients with distal rectal cancer, finding a balance between curative-intent therapy while having minimal impact on quality of life can be challenging. Furthermore, the risk of pelvic recurrence is higher in patients with rectal cancer compared with those with colon cancer, and locally recurrent rectal cancer is associated with a poor prognosis. Careful patient selection and the use of sequenced multimodality therapy following a multidisciplinary approach is recommended. These NCCN Guidelines Insights detail recent updates to the NCCN Guidelines for Rectal Cancer, including the addition of endoscopic submucosal dissection as an option for early-stage rectal cancer, updates to the total neoadjuvant therapy approach based on the results of recent clinical trials, and the addition of a "watch-and-wait" nonoperative management approach for clinical complete responders to neoadjuvant therapy.
View details for DOI 10.6004/jnccn.2024.0041
View details for PubMedID 39151454
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Colon Cancer, Version 3.2024, NCCN Clinical Practice Guidelines in Oncology.
Journal of the National Comprehensive Cancer Network : JNCCN
2024; 22 (2 D)
Abstract
Colorectal cancer (CRC) is the fourth most frequently diagnosed cancer and the second leading cause of cancer death in the United States. Management of disseminated metastatic CRC involves various active drugs, either in combination or as single agents. The choice of therapy is based on consideration of the goals of therapy, the type and timing of prior therapy, the mutational profile of the tumor, and the differing toxicity profiles of the constituent drugs. This manuscript summarizes the data supporting the systemic therapy options recommended for metastatic CRC in the NCCN Guidelines for Colon Cancer.
View details for DOI 10.6004/jnccn.2024.0029
View details for PubMedID 38862008
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Phase II trial of organ preservation program using short-course radiation and FOLFOXIRI for rectal cancer (SHORT-FOX).
LIPPINCOTT WILLIAMS & WILKINS. 2024
View details for Web of Science ID 001275557400852
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Anal Carcinoma, Version 2.2023, NCCN Clinical Practice Guidelines in Oncology.
Journal of the National Comprehensive Cancer Network : JNCCN
2023; 21 (6): 653-677
Abstract
This discussion summarizes the NCCN Clinical Practice Guidelines for managing squamous cell anal carcinoma, which represents the most common histologic form of the disease. A multidisciplinary approach including physicians from gastroenterology, medical oncology, surgical oncology, radiation oncology, and radiology is necessary. Primary treatment of perianal cancer and anal canal cancer are similar and include chemoradiation in most cases. Follow-up clinical evaluations are recommended for all patients with anal carcinoma because additional curative-intent treatment is possible. Biopsy-proven evidence of locally recurrent or persistent disease after primary treatment may require surgical treatment. Systemic therapy is generally recommended for extrapelvic metastatic disease. Recent updates to the NCCN Guidelines for Anal Carcinoma include staging classification updates based on the 9th edition of the AJCC Staging System and updates to the systemic therapy recommendations based on new data that better define optimal treatment of patients with metastatic anal carcinoma.
View details for DOI 10.6004/jnccn.2023.0030
View details for PubMedID 37308125
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Rectal Cancer, Version 2.2022, NCCN Clinical Practice Guidelines in Oncology.
Journal of the National Comprehensive Cancer Network : JNCCN
2022; 20 (10): 1139-1167
Abstract
This selection from the NCCN Guidelines for Rectal Cancer focuses on management of malignant polyps and resectable nonmetastatic rectal cancer because important updates have been made to these guidelines. These recent updates include redrawing the algorithms for stage II and III disease to reflect new data supporting the increasingly prominent role of total neoadjuvant therapy, expanded recommendations for short-course radiation therapy techniques, and new recommendations for a "watch-and-wait" nonoperative management technique for patients with cancer that shows a complete response to neoadjuvant therapy. The complete version of the NCCN Guidelines for Rectal Cancer, available online at NCCN.org, covers additional topics including risk assessment, pathology and staging, management of metastatic disease, posttreatment surveillance, treatment of recurrent disease, and survivorship.
View details for DOI 10.6004/jnccn.2022.0051
View details for PubMedID 36240850
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Phase II trial of organ preservation program using short-course radiation and folfoxiri for rectal cancer (SHORT-FOX)
LIPPINCOTT WILLIAMS & WILKINS. 2022
View details for DOI 10.1200/JCO.2022.40.4_suppl.TPS218
View details for Web of Science ID 000770995900213
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Colon Cancer, Version 2.2021, NCCN Clinical Practice Guidelines in Oncology.
Journal of the National Comprehensive Cancer Network : JNCCN
2021; 19 (3): 329–59
Abstract
This selection from the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Colon Cancer focuses on systemic therapy options for the treatment of metastatic colorectal cancer (mCRC), because important updates have recently been made to this section. These updates include recommendations for first-line use of checkpoint inhibitors for mCRC, that is deficient mismatch repair/microsatellite instability-high, recommendations related to the use of biosimilars, and expanded recommendations for biomarker testing. The systemic therapy recommendations now include targeted therapy options for patients with mCRC that is HER2-amplified, or BRAF V600E mutation-positive. Treatment and management of nonmetastatic or resectable/ablatable metastatic disease are discussed in the complete version of the NCCN Guidelines for Colon Cancer available at NCCN.org. Additional topics covered in the complete version include risk assessment, staging, pathology, posttreatment surveillance, and survivorship.
View details for DOI 10.6004/jnccn.2021.0012
View details for PubMedID 33724754
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Rectal Cancer, Version 6.2020 Featured Updates to the NCCN Guidelines
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2020; 18 (7): 807–15
Abstract
The NCCN Guidelines for Rectal Cancer provide recommendations for the diagnosis, evaluation, treatment, and follow-up of patients with rectal cancer. These NCCN Guidelines Insights summarize the panel discussion behind recent important updates to the guidelines. These updates include clarifying the definition of rectum and differentiating the rectum from the sigmoid colon; the total neoadjuvant therapy approach for localized rectal cancer; and biomarker-targeted therapy for metastatic colorectal cancer, with a focus on new treatment options for patients with BRAF V600E- or HER2 amplification-positive disease.
View details for DOI 10.6004/jnccn.2020.0032
View details for Web of Science ID 000577820100003
View details for PubMedID 32634771
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IMMUNE PROFILING TO PREDICT RECOVERY OUTCOMES AFTER SURGERY
LIPPINCOTT WILLIAMS & WILKINS. 2020: 66–67
View details for Web of Science ID 000587668800152
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Pelvic/Perineal Reconstruction: Time to Consider the Anterolateral Thigh Flap as a First-line Option?
Plastic and reconstructive surgery. Global open
2020; 8 (4): e2733
Abstract
Abdominoperineal resection (APR) and pelvic exenteration continue to be common procedures for the treatment of colorectal malignancy. The workhorse flap for reconstruction in these instances has been the vertical rectus abdominis myocutaneous flap. The associated donor site morbidity, however, cannot be ignored. Here, we provide a review of the literature and present the senior author's (A.M.) experience using the pedicled anterolateral thigh (ALT) flap for reconstruction of soft tissue defects following APR and pelvic exenteration.Patients who underwent pelvic/perineal reconstruction with pedicled ALT flaps between 2017 and 2019 were included in the study. Parameters of interest included age, gender, body mass index, comorbidities, history of radiation, extent of ablative surgery, and postoperative complication rate.A total of 23 patients (16 men and 7 women) with a median age and body mass index of 66 years (inter-quartile range [IQR]: 49-71 years) and 24.9 kg/m2 (IQR: 24.2-26.7 kg/m2) were included in the study, respectively. Thirteen (56.5%) patients presented with rectal cancer, 5 (21.7%) with anal squamous cell carcinoma (SCC), 4 (17.4%) with Crohn's disease, and 1 (4.3%) with Paget's disease. Nineteen patients (82.6%) received neoadjuvant radiation. Nine (39.1%) patients experienced 11 complications (2 major and 9 minor). The most common complication was partial perineal wound dehiscence (N = 6 [26.1%]). Stable soft tissue coverage was achieved in all but one patient.The ALT flap allows for stable soft tissue coverage following APR and pelvic exenteration without being associated with abdominal donor site morbidity. Consideration to its use as a first-line reconstructive option should be given in pelvic/perineal reconstruction.
View details for DOI 10.1097/GOX.0000000000002733
View details for PubMedID 32440406
View details for PubMedCentralID PMC7209827
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Oncologic and Perioperative Outcomes of Laparoscopic, Open, and Robotic Approaches for Rectal Cancer Resection: A Multicenter, Propensity Score-Weighted Cohort Study.
Diseases of the colon and rectum
2019
Abstract
BACKGROUND: Minimally invasive approaches have been shown to reduce surgical site complications without compromising oncologic outcomes.OBJECTIVE: The primary aim of this study is to evaluate the rates of successful oncologic resection and postoperative outcomes among laparoscopic, open, and robotic approaches to rectal cancer resection.DESIGN: This is a multicenter, quasiexperimental cohort study using propensity score weighting.SETTINGS: Interventions were performed in hospitals participating in the American College of Surgeons National Surgical Quality Improvement Program.PATIENTS: Adult patients who underwent rectal cancer resection in 2016 were included.MAIN OUTCOME MEASURES: The primary outcome was a composite variable indicating successful oncologic resection, defined as negative distal and radial margins with at least 12 lymph nodes evaluated.RESULTS: Among 1028 rectal cancer resections, 206 (20%) were approached laparoscopically, 192 (18.7%) were approached robotically, and 630 (61.3%) were open. After propensity score weighting, there were no significant sociodemographic or preoperative clinical differences among subcohorts. Compared to the laparoscopic approach, open and robotic approaches were associated with a decreased likelihood of successful oncologic resection (ORadj = 0.64; 95% CI, 0.43-0.94 and ORadj = 0.60; 95% CI, 0.37-0.97), and the open approach was associated with an increased likelihood of surgical site complications (ORadj = 2.53; 95% CI, 1.61-3.959). Compared to the laparoscopic approach, the open approach was associated with longer length of stay (6.8 vs 8.6 days, p = 0.002).LIMITATIONS: This was an observational cohort study using a preexisting clinical data set. Despite adjusted propensity score methodology, unmeasured confounding may contribute to our findings.CONCLUSIONS: Resections that were approached laparoscopically were more likely to achieve oncologic success. Minimally invasive approaches did not lengthen operative times and provided benefits of reduced surgical site complications and decreased postoperative length of stay. Further studies are needed to clarify clinical outcomes and factors that influence the choice of approach. See Video Abstract at http://links.lww.com/DCR/B70.
View details for DOI 10.1097/DCR.0000000000001534
View details for PubMedID 31764247
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Small Bowel Adenocarcinoma Version 1.2020
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2019; 17 (9): 1109–33
Abstract
Small bowel adenocarcinoma (SBA) is a rare malignancy of the gastrointestinal tract that has increased in incidence across recent years. Often diagnosed at an advanced stage, outcomes for SBA are worse on average than for other related malignancies, including colorectal cancer. Due to the rarity of this disease, few studies have been done to direct optimal treatment, although recent data have shown that SBA responds to treatment differently than colorectal cancer, necessitating a separate approach to treatment. The NCCN Guidelines for Small Bowel Adenocarcinoma were created to establish an evidence-based standard of care for patients with SBA. These guidelines provide recommendations on the workup of suspected SBA, primary treatment options, adjuvant treatment, surveillance, and systemic therapy for metastatic disease. Additionally, principles of imaging and endoscopy, pathologic review, surgery, radiation therapy, and survivorship are described.
View details for DOI 10.6004/jnccn.2019.0043
View details for Web of Science ID 000487242700012
View details for PubMedID 31487687
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Anal Carcinoma, Version 2.2018
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2018; 16 (7): 852–71
Abstract
The NCCN Guidelines for Anal Carcinoma provide recommendations for the management of patients with squamous cell carcinoma of the anal canal or perianal region. Primary treatment of anal cancer usually includes chemoradiation, although certain lesions can be treated with margin-negative local excision alone. Disease surveillance is recommended for all patients with anal carcinoma because additional curative-intent treatment is possible. A multidisciplinary approach including physicians from gastroenterology, medical oncology, surgical oncology, radiation oncology, and radiology is essential for optimal patient care.
View details for DOI 10.6004/jnccn.2018.0060
View details for Web of Science ID 000438786300009
View details for PubMedID 30006428
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Rectal Cancer, Version 2.2018 Clinical Practice Guidelines in Oncology
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2018; 16 (7): 874–901
Abstract
The NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Rectal Cancer address diagnosis, staging, surgical management, perioperative treatment, management of recurrent and metastatic disease, disease surveillance, and survivorship in patients with rectal cancer. This portion of the guidelines focuses on the management of localized disease, which involves careful patient selection for curative-intent treatment options that sequence multimodality therapy usually comprised of chemotherapy, radiation, and surgical resection.
View details for DOI 10.6004/jnccn.2018.0061
View details for Web of Science ID 000438786300010
View details for PubMedID 30006429
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NCCN Guidelines (R) Insights Colon Cancer, Version 2.2018 Featured Updates to the NCCN Guidelines
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2018; 16 (4): 359–69
Abstract
The NCCN Guidelines for Colon Cancer provide recommendations regarding diagnosis, pathologic staging, surgical management, perioperative treatment, surveillance, management of recurrent and metastatic disease, and survivorship. These NCCN Guidelines Insights summarize the NCCN Colon Cancer Panel discussions for the 2018 update of the guidelines regarding risk stratification and adjuvant treatment for patients with stage III colon cancer, and treatment of BRAF V600E mutation-positive metastatic colorectal cancer with regimens containing vemurafenib.
View details for DOI 10.6004/jnccn.2018.0021
View details for Web of Science ID 000429534300005
View details for PubMedID 29632055
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Colon Cancer, Version 1.2017 Clinical Practice Guidelines in Oncology
JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK
2017; 15 (3): 370-398
Abstract
This portion of the NCCN Guidelines for Colon Cancer focuses on the use of systemic therapy in metastatic disease. Considerations for treatment selection among 32 different monotherapies and combination regimens in up to 7 lines of therapy have included treatment history, extent of disease, goals of treatment, the efficacy and toxicity profiles of the regimens, KRAS/NRAS mutational status, and patient comorbidities and preferences. Location of the primary tumor, the BRAF mutation status, and tumor microsatellite stability should also be considered in treatment decisions.
View details for Web of Science ID 000395889300010
View details for PubMedID 28275037
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Rectal Cancer, Version 2.2015.
Journal of the National Comprehensive Cancer Network
2015; 13 (6): 719-728
Abstract
The NCCN Guidelines for Rectal Cancer begin with the clinical presentation of the patient to the primary care physician or gastroenterologist and address diagnosis, pathologic staging, surgical management, perioperative treatment, posttreatment surveillance, management of recurrent and metastatic disease, and survivorship. The NCCN Rectal Cancer Panel meets at least annually to review comments from reviewers within their institutions, examine relevant new data from publications and abstracts, and reevaluate and update their recommendations. These NCCN Guidelines Insights summarize major discussion points from the 2015 NCCN Rectal Cancer Panel meeting. Major discussion topics this year were perioperative therapy options and surveillance for patients with stage I through III disease.
View details for PubMedID 26085388
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Insulin increases the release of proinflammatory mediators
63rd Annual Meeting of the American-Association-for-the-Surgery-of-Trauma
LIPPINCOTT WILLIAMS & WILKINS. 2008: 367–72
Abstract
Strict glucose control with insulin is associated with decreased mortality in a mixed patient population in the intensive care unit. Controversy exists regarding the relative benefits of glucose control versus a direct advantageous effect of exogenous insulin. As a combined medical/surgical population differs significantly from the critically injured patient primed for secondary insult, our purpose was to determine the influence of insulin on activated macrophages. Our hypothesis was that insulin would directly abrogate the inflammatory cascade.Differentiated human monocytic THP-1 cells were stimulated with endotoxin (lipopolysaccharide [LPS], 100 ng/mL) for 6 hours. Cells were treated +/-10(-7) M insulin for 1 hour and 24 hours. Total RNA was isolated and gene expression for TNF-alpha and IL-6 performed using Q-RT-PCR. Supernatants were assayed for TNF-alpha and IL-6 protein by ELISA.At 1 hour, compared with macrophages treated with LPS alone, macrophages treated with insulin produced significantly more TNF-alpha protein (11.4 +/- 5.9 pg/mL vs. 32.5 +/- 3.1 pg/mL; p < 0.03). At 24 hours compared with macrophages treated with LPS alone, macrophages treated with insulin produced significantly more TNF-alpha protein (83 +/- 2.02 pg/mL vs. 114 +/- 6.54 pg/mL; p < 0.01). However, gene expression of TNF-alpha and IL-6 was not different in LPS stimulated macrophages with and without insulin treatment at both 1 hour and 24 hours.Contrary to our hypothesis, insulin does not have direct anti-inflammatory properties in this experimental model. In fact, insulin increases proinflammatory cytokine protein levels from activated macrophages.
View details for DOI 10.1097/TA.0b013e3181801cc0
View details for Web of Science ID 000258461600026
View details for PubMedID 18695473
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Endovascular management of a gunshot wound to the thoracic aorta
35th Annual Meeting of the Western-Trauma-Association
LIPPINCOTT WILLIAMS & WILKINS. 2006: 204–8
View details for Web of Science ID 000235066300046
View details for PubMedID 16456457
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Are temporary inferior vena cava filters really temporary?
57th Annual Meeting of the Southwestern-Surgical-Congress
EXCERPTA MEDICA INC-ELSEVIER SCIENCE INC. 2005: 858–63
Abstract
Despite significant risk for venous thromboembolism, severely injured trauma patients often are not candidates for prophylaxis or treatment with anticoagulation. Long-term inferior vena cava (IVC) filters are associated with increased risk of postphlebitic syndrome. Retrievable IVC filters potentially offer a better solution, but only if the filter is removed; our hypothesis is that the most of them are not.This retrospective study queried a level I trauma registry for IVC filter insertion from September 1997 through June 2004.One IVC filter was placed before the availability of retrievable filters in 2001. Since 2001, 27 filters have been placed, indicating a change in practice patterns. Filters were placed for prophylaxis (n = 11) or for therapy in patients with pulmonary embolism or deep vein thrombosis (n = 17). Of 23 temporary filters, only 8 (35%) were removed.Surgeons must critically evaluate indications for IVC filter insertion, develop standard criteria for placement, and implement protocols to ensure timely removal of temporary IVC filters.
View details for DOI 10.1016/j.amjsurg.2005.08.009
View details for Web of Science ID 000233759800007
View details for PubMedID 16307934