Publications by authors named "David Mahvi"

Although cancer cachexia is classically characterized as a systemic inflammatory disorder, emerging evidence indicates that weight loss also associates with local tissue inflammation. We queried the regulation of this inflammation and its causality to cachexia by exploring skeletal muscle, whose atrophy strongly associates with poor outcomes. Using multiple mouse models and patient samples, we show that cachectic muscle is marked by enhanced innate immunity.

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Objective: This large database study assessed whether extended pharmacologic prophylaxis for venous thromboembolism after colon cancer resection was associated with improved oncologic survival.

Background: Heparin derivatives may confer an antineoplastic effect via a variety of mechanisms (eg, inhibiting angiogenesis in the tumor microenvironment). Studies evaluating the oncologic benefit of heparin and its derivatives have been limited in postsurgical patients.

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While surgery represents a major therapy for most solid organ cancers, local recurrence is clinically problematic for cancers such as sarcoma for which adjuvant radiotherapy and systemic chemotherapy provide minimal local control or survival benefit and are dose-limited due to off-target side effects. We describe an implantable, biodegradable poly(1,2-glycerol carbonate) and poly(caprolactone) film with entrapped and covalently-bound paclitaxel enabling safe, controlled, and extended local delivery of paclitaxel achieving concentrations 10,000× tissue levels compared to systemic administration. Films containing entrapped and covalently-bound paclitaxel implanted in the tumor bed, immediately after resection of human cell line-derived chondrosarcoma and patient-derived xenograft liposarcoma and leiomyosarcoma in mice, improve median 90- or 200-day recurrence-free and overall survival compared to control mice.

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Background: Although randomized controlled trials on neoadjuvant chemotherapy for gastric cancer have included some T1-staged tumors, overall survival (OS) has not been analyzed for this subset. Due to the low negative predictive value of clinical staging and the benefits of neoadjuvant chemotherapy for locally advanced disease, identifying patient groups with early-stage gastric cancer that may benefit from neoadjuvant chemotherapy is of merit.

Aims: The objective of this study was to evaluate the relationship between OS and sequence of surgical therapy for clinical T1 gastric cancer.

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Introduction: Hypocalcemia following total thyroidectomy (TT) is common due to postoperative parathyroid dysfunction and vitamin D deficiency. Given the association between obesity and vitamin D deficiency, we sought to correlate body mass index (BMI) with hypocalcemia after TT.

Methods: Patients undergoing TT between 2016 and 2020 were identified from the American College of Surgeons National Surgical Quality Improvement Program thyroidectomy-targeted database.

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Unlabelled: Surgery is the only potentially curative treatment for localized soft-tissue sarcomas. However, for sarcomas arising in the retroperitoneum, locoregional recurrence rates are 35% to 59% despite resection. Doxorubicin (DOX) is the standard first-line systemic chemotherapy for advanced soft-tissue sarcoma, yet its intravenous administration yields limited clinical efficacy and results in dose-limiting cardiotoxicity.

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Risk of locoregional recurrence after sarcoma resection is high, increasing both morbidity and mortality. Intraoperative implantation of paclitaxel (PTX)-eluting polymer films locally delivers sustained, supratherapeutic PTX concentrations to the tumor bed that are not clinically feasible with systemic therapy, thereby reducing recurrence and improving survival in a murine model of recurrent sarcoma. However, the biology underlying increased efficacy of PTX-eluting films is unknown and provides the impetus for this work.

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Background: Participation in surgical society meetings serves as a proxy for academic success and is important for career development. This study aimed to investigate and report the gender breakdown of presenters at recent Society of Surgical Oncology (SSO) meetings.

Methods: Genders of presenters for poster, parallel, plenary, and video sessions at SSO meetings from 2014 through 2019 were collected.

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Introduction: Hypocalcemia following total thyroidectomy is common due to postoperative parathyroid dysfunction. We sought to identify the impact of obesity on postthyroidectomy hypocalcemia.

Methods: We performed a single-center retrospective study of all total thyroidectomies performed from 2016 to 2019 after implementation of an updated calcium supplementation protocol.

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Background: Recurrent laryngeal nerve (RLN) injury is a significant complication after thyroidectomy. Understanding risk factors for RLN injury and the associated postoperative complications may help inform quality improvement initiatives.

Methods: The American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) thyroidectomy-targeted database was utilized for patients undergoing total thyroidectomy between 2016 and 2017.

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Background: Several studies have identified disparities in pancreatic cancer treatment associated with gender, race, and ethnicity. There are limited data examining disparities in short-term adverse outcomes after pancreatic resection for cancer. The aim of this study is to evaluate associations of gender, race, and ethnicity with morbidity and mortality after pancreatic resection for malignancy.

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Article Synopsis
  • - The COVID-19 pandemic has caused surgery delays for cancer patients to reduce exposure and save resources, negatively affecting their treatment.
  • - A review of multiple studies found that delays of over 4 weeks in certain cancers, like breast and ovarian cancer, significantly decreased survival rates, while delays over 3 months worsened outcomes for others like colorectal cancer and melanoma.
  • - However, some cancers, including gastric and advanced melanoma, showed no significant difference in outcomes with surgical delays, indicating variability in how different cancer types respond to timing of surgeries.
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Introduction: Obesity is a well-established risk factor for endometrial cancer and is thought to adversely affect outcomes. The impact of significant and sustained weight loss as achieved by bariatric surgery for women with endometrial cancer is not well understood.

Methods: We performed an institutional retrospective review of patients who underwent bariatric surgery and were diagnosed with premalignant or malignant uterine disease from 1989 to 2019 (n=171).

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Purpose: To examine financial toxicity and strain among men in an equal access healthcare system based on social determinants and clinical characteristics.

Methods: Observational study among men receiving prostate cancer care (n = 49) at a Veterans Health Administration (VHA) facility. Financial hardship included overall financial strain and financial toxicity due to healthcare costs.

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Neurofibromatosis type I (NF1) is an autosomal dominant genetic disorder associated with characteristic skin findings, as well as a fourfold increase in risk of malignancy. NF1 patient malignancies commonly include the central and peripheral nervous system, but these patients are also at high risk of developing gastrointestinal (GI) tumors. While most often these GI tumors are benign upper GI neurofibromas; clinicians should have a high suspicion for malignant tumors, degeneration into a malignant peripheral nerve sheath tumor or less common associated malignancies such as well-differentiated neuroendocrine tumor (formerly carcinoid tumor), when patients present with multiple GI tumors.

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Background: The postoperative mortality rate of pancreaticoduodenectomy is decreasing over time. It is unknown whether this is related to reduction in incidence of major morbidity or failure to rescue. We aimed to make this determination.

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Purpose: Rectal cancer resections can be associated with long and complicated postoperative recoveries. Many patients undergoing these operations are discharged to rehabilitation or skilled nursing facilities. The purpose of this study was to identify preoperative and intraoperative factors associated with increased risk for non-home discharge after rectal cancer resection.

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Purpose: Reoperation after radical cystectomy (RC) is common but the types of reoperation after RC and associated risk factors have not been fully characterized. Here, we provide a detailed, contemporary account of the factors that drive surgical reoperation within the first 30-days after surgery, identify at risk patient populations, and describe common reoperations.

Materials And Methods: The American College of Surgeons National Surgical Quality Improvement Program database (2012-2017) was analyzed to identify 30-day reoperation rates after RC.

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Background: Isolated case series from highly specialized centers suggest the feasibility of a 23-h hospital stay after colectomy. We sought to determine preoperative variables associated with discharge within 23 h after colectomy to identify patients best suited for a short-stay model.

Methods: The American College of Surgeons NSQIP Colectomy-Targeted database was used to identify patients who underwent elective colectomy from 2012 to 2017.

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Background: The Multicenter Selective Lymphadenectomy Trial II results suggest that future radical axillary lymphadenectomy (ALND) will be performed for bulkier metastatic disease. The utility of level III lymph node (LN) dissection in melanoma patients with palpable metastatic axillary disease was assessed.

Methods: We performed a retrospective chart review of patients who underwent ALND (levels I-III) for metastatic melanoma from 2005 to 2017.

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Background: Anatomic hepatectomies can be associated with complicated post-operative recoveries, often with discharge to post-acute care facilities. This study identifies preoperative and intraoperative factors associated with increased risk for non-home discharge destination after major hepatectomy.

Methods: Patients undergoing major hepatectomy were identified in the NSQIP Targeted Hepatectomy Dataset (2014-2016).

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Background: Pancreaticoduodenectomy is a complex surgery frequently associated with prolonged hospitalizations. However, there are a subset of patients discharged within 5 days from surgery; the preoperative and intraoperative characteristics of this subset are unknown.

Methods: The NSQIP Targeted Pancreatectomy Dataset was used from 2014 to 2016.

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Introduction: Pancreaticoduodenectomy is a complex surgical procedure. The purpose of this study was to identify factors associated non-home discharge destination and to characterize outcomes after non-home discharge.

Methods: 10,719 pancreaticoduodenectomy cases contained in the National Surgical Quality Improvement Program (NSQIP) Targeted Pancreatectomy dataset (years 2014-2016) were examined with univariate and multivariate logistic regression.

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Locoregional recurrence negatively impacts both long-term survival and quality of life for several malignancies. For appropriate-risk patients with an isolated, resectable, local recurrence, surgery represents the only potentially curative therapy. However, oncologic outcomes remain inferior for patients with locally recurrent disease even after macroscopically complete resection.

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Phase I testing of the hu14.18-IL2 immunocytokine (IC) in melanoma patients showed immune activation, reversible toxicities, and a maximal tolerated dose of 7.5 mg/m/day.

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