Publications by authors named "Michelle Dugan"

Robotic platforms are increasingly utilized in surgery, offering unique technical advantages, though there is a scarcity of difficulty scoring systems (DSS) for these procedures. DSS aids in understanding operative complexities and enhancing preoperative planning. With IRB approval, data were collected on 200 consecutive adult patients who underwent robotic pancreaticoduodenectomy at a high-volume institution from 2019 to 2022.

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Background: Nodal surveillance (NS) has overtaken completion lymphadenectomy as the preferred management for sentinel node-positive (SLN+) melanoma, but requires frequent exams and nodal ultrasound (US). Social determinants of health (SDoH) may affect US adherence in real-world populations, and evaluation of these potential impacts is needed.

Methods: Adults with SLN+ melanoma diagnosed from July 2017 to December 2019 who received NS at nine cancer centers were identified retrospectively.

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Background: Ten percent of patients with melanoma develop in-transit metastases (ITM). Isolated limb infusion (ILI) is a well-established therapy for unresectable ITM on the extremities, but the ideal sequencing/line of therapy of ILI has not been defined. This study evaluates ILI as first-line, second-line, or third or later-line therapy.

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Article Synopsis
  • Patients with locoregionally advanced melanoma still face a poor prognosis despite new systemic therapies.
  • Direct delivery of treatment through intralesional injections and intra-arterial infusions reduces side effects and improves effectiveness.
  • Recent advancements include approved and trialed therapies like Talimogene laherparepvec (T-VEC), PV-10, TAVOkinase/electrocorporation, and percutaneous hepatic perfusion (PHP) for treating melanoma.
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Background: Isolated limb infusion (ILI) treats unresectable extremity malignancies with high-dose regional chemotherapy limited to the limb. This study assessed long-term outcomes after ILI for limb-threatening sarcomas.

Methods: A retrospective review analyzed patients with an extremity sarcoma who underwent ILI with melphalan and dactinomycin from 2008 to 2023 at a single institution.

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Background: Uveal melanoma often metastasizes to the liver, portending a poor prognosis. Melphalan/hepatic delivery system (HDS) via percutaneous hepatic perfusion (PHP) is a minimally invasive means of circulating high-dose chemotherapy through the affected liver. This study evaluated melphalan/HDS use as either first-line or second-line treatment to guide treatment sequencing.

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Article Synopsis
  • - The treatment methods for advanced melanoma have improved significantly with new therapies like immune checkpoint inhibitors and targeted therapies, leading to better patient outcomes than traditional methods.
  • - Around 50% of melanoma cases have BRAF mutations, particularly the BRAF V600E mutation, which can cause tumors to become resistant to BRAF inhibitors within about six months when used alone.
  • - Combining BRAF inhibitors with MEK inhibitors, and potentially adding anti-PD-1/PD-L1 inhibitors, may enhance treatment effectiveness and maintain manageable side effects compared to using just one or two agents.
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Locoregionally advanced and metastatic melanoma represent a challenging clinical problem, but in the era of immune checkpoint blockade and intralesional and infusional therapies, more options are available for use. Isolated limb infusion (ILI) was first introduced in the 1990s for the management of advanced melanoma, followed by the utilization of isolated extremity perfusion (ILP). Following this, intralesional oncolytic viruses, xanthene dyes, and cytokines were introduced for the management of in-transit metastases as well as unresectable, advanced melanoma.

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Background: The robotic platform is growing in popularity for hepatobiliary resections. Although the learning curve for basic competency has been reported, this is the first study to analyze the learning curve to achieve long-term mastery on a decade of experience with more than 500 robotic hepatectomies.

Methods: After institutional review board approval, 500 consecutive robotic hepatectomies from 2013 to 2023 were analyzed.

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Background: As the first comprehensive investigation into hospital readmissions following robotic hepatectomy for neoplastic disease, this study aims to fill a critical knowledge gap by evaluating risk factors associated with readmission and their impact on survival and the financial burden.

Methods: The study analyzed a database of robotic hepatectomy patients, comparing readmitted and non-readmitted individuals post-operatively using 1:1 propensity score matching. Statistical methods included Chi-square, Mann-Whitney U, T-test, binomial logistic regression, and Kaplan-Meier analysis.

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Article Synopsis
  • A new Difficulty Scoring System (DSS) has been created for robotic hepatectomy to help predict surgical difficulty and improve preoperative planning, filling a gap since current DSS only applies to laparoscopic procedures.
  • The study analyzed data from 328 patients, ultimately including 274 after removing certain cases, and identified key factors such as tumor characteristics and surgical requirements that influence operative time and estimated blood loss (EBL).
  • The final scoring system classified cases into four difficulty levels, with associated metrics showing significant variances in patient outcomes like operative duration and mortality across these groups, highlighting the DSS's potential for clinical application and future validation.
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Acral lentiginous melanoma is a rare subtype of melanoma generally associated with poor outcomes, even when diagnosed at an early stage. The tumor genetic profile remains poorly understood, but it is known to have a suppressed immune environment compared to that of non-acral cutaneous melanomas, which limits therapy options. There is significant attention on the development of novel therapeutic approaches, although studies are limited due to disease rarity.

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Esophageal cancer is a significant health concern, with the robotic platform being increasingly adopted for transhiatal esophagectomy (THE). While literature exists regarding the cost of robotic THE and its benefits, there is limited data analyzing cost and concurrent hospital reimbursement based on payor or provider. This study aimed to compare hospital reimbursement after robotic THE for patients with Medicare versus private insurance.

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Background: Despite increased adoption of the robotic platform for complex hepatobiliary resections for malignant disease, little is known about long-term survival outcomes. This is the first study to evaluate the postoperative outcomes, and short- and long-term survival rates after a robotic hepatectomy for five major malignant disease processes.

Methods: A prospectively collected database of patients who underwent a robotic hepatectomy for malignant disease was reviewed.

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Background And Objectives: Primary cutaneous leiomyosarcoma (cLMS), a rare, typically intradermal tumor, has previously been reported to exhibit an indolent course of disease with zero-to-low risk of local recurrence or distant metastasis. This study seeks to evaluate recurrence and survival of cLMS patients through study of its clinicopathologic and treatment characteristics.

Methods: All patients included underwent resection of primary cLMS at this institution between 2006 and 2019.

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Background: A rare appendiceal malignancy is characterized by both glandular and neuroendocrine histology. It often presents with dissemination of the perforated tumor to peritoneal surfaces. Current treatments involve systemic chemotherapy, cytoreductive surgery and perioperative intraperitoneal chemotherapy.

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A high proportion of patients with severe systemic atherosclerotic disease present with the involvement of both the coronary and aortoiliac arteries. For these patients with multiple comorbidities and high surgical risk, it is critical to minimize the overall physiologic burden of the operation when possible. Furthermore, with severe or complete occlusion of vascular supply to the lower extremities, it is beneficial to avoid two-stage surgeries because of the high risk of irreversible ischemia necessitating amputation.

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Background: Opioid misuse is currently plaguing the US. Efforts to reduce this include opioid prescribing education (OPE). Orthopaedic residents often prescribe opioids but, their education is unknown.

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