Publications by authors named "Doung Y"

Background: The Centers for Medicare & Medicaid Services (CMS) implemented the Bundled Payments for Care Improvement Advanced (BPCIA) Model that covers 90-day care episodes after select orthopedic procedures including anatomic or reverse ball-and-socket total shoulder arthroplasty (TSA/rTSA). This study investigated whether patients undergoing TSA/rTSA for non-degenerative processes incur higher costs than patients undergoing arthroplasty for degenerative processes.

Methods: A retrospective review was conducted of all patients at a single academic medical center enrolled in the BPCIA model for TSA/rTSA from October 1, 2018, through December 31, 2022.

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Musculoskeletal oncology involves rare diseases. As a result, there is a paucity of literature to guide practitioners. Studies are often clinical experience, retrospective reviews, noncomparative studies, and involve small numbers of patients.

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Background: Available codes in the ICD-10 do not accurately reflect soft tissue sarcoma diagnoses, and this can result in an underrepresentation of soft tissue sarcoma in databases. The National VA Database provides a unique opportunity for soft tissue sarcoma investigation because of the availability of all clinical results and pathology reports. In the setting of soft tissue sarcoma, natural language processing (NLP) has the potential to be applied to clinical documents such as pathology reports to identify soft tissue sarcoma independent of ICD codes, allowing sarcoma researchers to build more comprehensive databases capable of answering a myriad of research questions.

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Purpose: This guideline provides evidence-based recommendations for palliative external beam radiation therapy (RT) in symptomatic bone metastases.

Methods: The ASTRO convened a task force to address 5 key questions regarding palliative RT in symptomatic bone metastases. Based on a systematic review by the Agency for Health Research and Quality, recommendations using predefined consensus-building methodology were established; evidence quality and recommendation strength were also assessed.

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Article Synopsis
  • Spindle cell/sclerosing rhabdomyosarcoma (SSRMS) is a complex and diverse type of cancer with various genetic characteristics.
  • Recent discoveries have identified specific gene fusions that influence the disease's behavior, particularly in intraosseous SSRMS, where one type is known to be more aggressive.
  • A new case of intraosseous SSRMS with a specific gene fusion was documented, detailing a treatment plan and a 52-month follow-up, suggesting this variant may behave differently, with more local recurrences but fewer metastases compared to others.
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Background: Surgical site infections (SSIs) represent a major complication following oncologic reconstructions. Our objectives were (1) to assess whether the use of postoperative drains and/or negative pressure wound therapy (NPWT) were associated with SSIs following lower-extremity oncologic reconstruction and (2) to identify factors associated with the duration of postoperative drains and with the duration of NPWT.

Methods: This is a secondary analysis of the Prophylactic Antibiotic Regimens in Tumor Surgery (PARITY) trial, a multi-institution randomized controlled trial of lower-extremity oncologic reconstructions.

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Background: Although the treatment of lower-extremity bone tumors is similar between adult and pediatric patients, differences in outcomes are unknown. Outcomes for lower-extremity oncologic reconstruction have been challenging to study because of the low incidence and heterogeneity in disease and patient characteristics. The PARITY (Prophylactic Antibiotic Regimens in Tumor Surgery) trial is the largest prospective data set assembled to date for patients with lower-extremity bone tumors and presents an opportunity to investigate differences in outcomes between these groups.

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  • * Conducted as a secondary analysis of the PARITY trial, the study examined opioid consumption patterns, revealing that about 33.6% of patients used opioids before surgery and only 6.6% after one year post-surgery.
  • * Metastatic bone disease surgery was identified as the only predictor of chronic opioid use at one year, while other factors like preoperative use and demographics showed no significant correlation.
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Background: Wound complications are common after resection of soft tissue sarcomas, with published infection rates ranging from 10% to 35%. Multiple studies have reported on the atypical flora comprising these infections, which are often polymicrobial and contain anaerobic bacteria, and recent studies have noted the high prevalence of anaerobic bacterial infections after soft tissue sarcoma resection [ 26, 35 ]. Based on this, our institution changed clinical practice to include an antibiotic with anaerobic coverage in addition to the standard first-generation cephalosporin for prophylaxis during soft tissue sarcoma resections.

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Article Synopsis
  • * Conducted across 48 clinical sites in 12 countries between 2013 and 2019, the trial included 611 patients with bone or soft tissue tumors requiring surgical intervention.
  • * The primary outcome measured was the rate of surgical site infections within one year post-surgery, alongside secondary outcomes such as complications from antibiotics and overall patient health and recovery.
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Introduction: Cohorts from the electronic health record are often defined by the Current Procedural Terminology (CPT) codes. The error prevalence of CPT codes for patients receiving surgical treatment of metastatic disease of the femur has not been investigated, and the predictive value of coding ontologies to identify patients with metastatic disease of the femur has not been adequately discussed.

Methods: All surgical cases at a single academic tertiary institution from 2010 through 2015 involving prophylactic stabilization of the femur or fixation of a pathologic fracture of the femur were identified using the CPT and International Classification of Disease (ICD) codes.

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Objectives: To determine the proportion of patients with extremity sarcoma who would be willing to participate in a clinical trial in which they would be randomised to one of four different postoperative sarcoma surveillance regimens. Additionally, we assessed patients' perspectives on the burden of cancer care, factors that influence comfort with randomisation and the importance of cancer research.

Design: Prospective, cross-sectional patient survey.

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This review summarizes the biomechanical concepts, clinical outcomes and limitations of compressive osseointegration fixation for endoprosthetic reconstruction. Compressive osseointe - gration establishes stable fixation and integration through a novel mechanism; a Belleville washer system within the spindle applies 400-800 PSI force at the boneimplant interface. Compressive osseointegration can be used whenever standard endoprosthetic reconstruction is indicated.

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Introduction: A retrospective review was performed for patients in the Veterans Administration Healthcare System who underwent prophylactic stabilization of the femur for metastatic disease. The goal was to evaluate indications for prophylactic stabilization through Mirels criteria.

Methods: All veterans who underwent inpatient prophylactic femoral stabilization between October 2010 and September 2015 were identified.

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Background: The femur is the most common site of metastasis in the appendicular skeleton, and metastatic bone disease negatively influences quality of life. Orthopaedic surgeons are often faced with deciding whether to prophylactically stabilize an impending fracture, and it is unclear if prophylactic fixation increases the likelihood of survival.

Questions/purposes: Is prophylactic femur stabilization in patients with metastatic disease associated with different overall survival than fixation of a complete pathologic fracture?

Methods: We performed a retrospective, comparative study using the national Veterans Administration database.

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Background and purpose - Compressive osseointegration fixation is an alternative to intramedullary fixation for endoprosthetic reconstruction. Mechanical failure of compressive osseointegration presents differently on radiographs than stemmed implants, therefore we aimed to develop a reliable radiographic method to determine stable integration.Patients and methods - 8 reviewers evaluated 11 radiographic parameters from 29 patients twice, 2 months apart.

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Article Synopsis
  • The study compares hospital costs between oncology patients and those with osteoarthritis (OA) enrolled in the Comprehensive Care for Joint Replacement (CJR) bundled payment program.
  • Findings reveal that oncology patients have significantly higher total hospital costs ($40,862) compared to OA patients ($16,356) and are more likely to exceed the CJR target price.
  • The results indicate that oncology patients also have longer hospital stays (6.75 days vs. 2 days) and higher rates of discharge to skilled nursing facilities, leading to increased costs in those settings.
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Background: Cancer patients with advanced disease routinely exhaust available clinical regimens and lack actionable genomic medicine results, leaving a large patient population without effective treatments options when their disease inevitably progresses. To address the unmet clinical need for evidence-based therapy assignment when standard clinical approaches have failed, we have developed a probabilistic computational modeling approach which integrates molecular sequencing data with functional assay data to develop patient-specific combination cancer treatments.

Methods: Tissue taken from a murine model of alveolar rhabdomyosarcoma was used to perform single agent drug screening and DNA/RNA sequencing experiments; results integrated via our computational modeling approach identified a synergistic personalized two-drug combination.

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  • The Vancouver classification system for periprosthetic femur fractures is based on the stability of cemented femoral stems, and this study evaluates its effectiveness for cementless stems.
  • Researchers conducted a blinded radiographic study involving 53 patients, where orthopedic surgeons assessed radiographs for fracture classification and measured interobserver and intraobserver reliability.
  • Results indicated that the classification had moderate reliability with a kappa value of 0.45 and 20% of unstable fractures misclassified, suggesting that radiographic assessments alone may not be sufficient for determining stability in cementless femoral stems.
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  • The study explores infection types in patients with deep tissue infections following the surgical removal of soft-tissue sarcomas (STS), focusing on the role of anaerobic bacteria and associated risk factors.
  • Analysis of 64 patients revealed that Staphylococcus aureus was the most prevalent pathogen identified, with a significant number of infections being polymicrobial and involving anaerobic organisms.
  • The time between tumor removal and surgical debridement was notably longer for anaerobic infections compared to aerobic ones, suggesting that infections presenting after 53 days are likely to contain anaerobic pathogens, highlighting the need for targeted antibiotic treatment.
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Background: The optimal treatment of high-risk soft tissue sarcomas (STS) of the extremities remains controversial. We report follow-up from a phase II study of dose-intense chemotherapy with preoperative hypofractionated radiation in this population supplemented with subsequent data from an extensive institutional experience using this regimen.

Methods: Patients with localized, intermediate- or high-grade STS of the extremity or body wall measuring > 5 cm were treated with epirubicin 30 mg/m/day and ifosfamide 2.

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  • * It involved 20 patients, with some receiving sorafenib alongside chemoradiotherapy, and others just chemoradiotherapy, using MRI scans at various treatment points to assess tumor response.
  • * The research found that specific DCE-MRI parameters, like the rate constant (K), are stronger predictors of treatment response and correlation with tumor necrosis than standard size measurements, demonstrating their potential for improved early evaluation.
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  • Compressive osseointegration offers an alternative to traditional fixation methods, with a study tracking 116 patients over 2 to 9 years to evaluate its effectiveness and associated failure rates.
  • The study found a high 4-year survivorship free from aseptic mechanical failure at 93% and overall failure at 75%.
  • Factors such as the location of reconstruction (especially proximal tibia and distal femur) significantly increased the risk of overall and aseptic mechanical failure.
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Purpose: We conducted a phase I trial of the addition of sorafenib to a chemoradiotherapy regimen in patients with high-risk (intermediate/high grade, >5 cm) extremity soft tissue sarcoma undergoing limb salvage surgery. We conducted a correlative study of quantitative dynamic contrast-enhanced MRI (DCE-MRI) to assess response to treatment.

Experimental Design: Patients were treated at increasing dose levels of sorafenib (200 mg daily, 400 mg daily, 400 mg twice daily) initiated 14 days before three preoperative and three postoperative cycles of epirubicin/ifosfamide.

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