Publications by authors named "Brian H Chon"

Purpose: Hypofractionated radiation therapy has been safely implemented in the treatment of early-stage non-small cell lung cancer (NSCLC) but not locally advanced NSCLC owing to prohibitive toxicities with photon therapy. Proton therapy, however, may allow for safe delivery of hypofractionated radiation therapy. We sought to determine whether hypofractionated proton therapy with concurrent chemotherapy improves overall survival.

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Dermal fillers remain popular for facial rejuvenation but with its increasing use, the potential for more complications including blindness is present. This article focuses on the mechanism of filler-associated blindness, possible treatments, and future directions. Unfortunately, to date there is no proven treatment to reverse filler-induced blindness or visual compromise.

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Festoons represent a combination of fluid accumulation and soft tissue laxity in the superolateral cheek. They remain a difficult entity to treat. The ideal treatment for festoons would possess minimal invasiveness and recovery time, and predictably improve the condition.

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Thyroid eye disease is an auto-immune mediated orbitopathy which can cause dysthyroid compressive optic neuropathy. Traditional management of active thyroid eye disease includes temporizing high-dose steroids, orbital radiation and surgical decompression, which each possess significant limitations and/or side effects. Teprotumumab is an IGF-IR inhibitor recently FDA-approved for active thyroid eye disease.

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Purpose: To determine the dimensions and function of the auricular muscle and to consider applications of this muscle in facial plastic surgery.

Methods: Nonpreserved fresh frozen human cadaver dissections from the (HOSPITAL-Blinded) Body Donation program were dissected. The length and width of the superior auricular muscle were measured.

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Background: The purpose of this study was to evaluate the long-term patient experience with tetracycline injections for treatment of festoons.

Methods: Charts of all patients undergoing tetracycline injection for treatment of lower eyelid festoons at the Cole Eye Institute, Cleveland Clinic, between 2008 and 2018 were identified using billing records. Patients were invited to participate in a questionnaire based on the FACE-Q checklist, a previously validated questionnaire for studying cosmetic procedure outcomes.

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Purpose: Quality assurance and continuing quality improvement are integral parts of any radiation oncology practice. With increasingly conformal radiation treatments, it has become critical to focus on every slice of the target contour to ensure adequate tumor coverage and optimal normal tissue sparing. Proton therapy centers open internationally with increasing frequency, and radiation oncologists with varying degrees of subspecialization apply proton therapy in daily practice.

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Vaccinations for shingles are recommended for most adults over 60 years of age and are typically well tolerated. The present case describes acute onset of unilateral ptosis, proptosis, and orbital myositis developing within days after administration of shingles vaccination. The episode resolved to baseline after 1 week of treatment with steroids.

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Purpose: We report the safety data from the first multicenter phase 1 trial investigating the use of hypofractionated proton therapy with concurrent chemotherapy for patients with stage II or III non-small cell lung cancer.

Methods And Materials: From 2013 through 2018, patients with newly diagnosed stage II or III non-small cell lung cancer were enrolled in a multicenter phase 1 clinical trial evaluating concurrent chemotherapy with increasing dose-per-fraction proton therapy. This was a stepwise 5 + 2 dose-intensification protocol with the following dose arms: (1) 2.

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Purpose: To determine whether thyroid eye disease (TED) is associated with a change in temporal fossa soft tissue volume.

Methods: CT imaging studies were selected from patients with TED considering orbital decompression surgery and from an age-matched group of controls presenting to the Emergency Department for nontraumatic conditions requiring CT imaging. Measurements of the temporal fossa fat pad and soft tissue thickness were used as a proxy for volume and were performed using the zygomaticotemporal suture as a reference point.

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Purpose: To compare bony orbital volumes in young skulls with those of older skulls to elucidate aging-associated changes of the orbit.

Methods: One hundred Caucasian male skulls from the Hamann-Todd collection of the Cleveland Museum of Natural History were studied. There were 50 young skulls (age range, 19-33 years) and 50 senescent skulls (age range, 79-96 years).

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Surgical repair of orbital fractures with implants is a widely used treatment modality. While a variety of established complications are associated with this technique, most are directly understood and treated. Bloody epiphora is a finding with potentially ominous causes.

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Purpose: To quantify the predictive strength of anterior chamber area (ACA), anterior chamber volume (ACV), anterior chamber width (ACW), lens vault (LV), iris thickness (IT), and iris area (IArea) for 2 angle width parameters, trabecular-iris space area (TISA750) and angle opening distance (AOD750) at 750 μm from the scleral spur, in different ethnicities.

Design: Prospective, cross-sectional study.

Methods: Anterior segment optical coherence tomography images for 166 white, 90 African, 75 Hispanic, and 132 Chinese subjects were analyzed.

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Importance: Little is known about the necessity of multiple same-day intraocular pressure (IOP) measurements in describing the effect of IOP-lowering surgical procedures, and such evidence could affect surgical trial recruitment and retention of participants.

Objective: To determine whether a single IOP measurement might adequately approximate the mean of several measurements in glaucoma surgical trials.

Design, Setting, And Participants: A prospective, multicenter, interventional cohort from the prerandomization phase of a randomized clinical trial evaluating use of a supraciliary implant for treatment of IOP was conducted at multiple ophthalmology clinics.

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IMPORTANCE While medication efficacy is well documented in clinical trials, less is known of medication effectiveness in real-world clinical settings. OBJECTIVE To assess the effectiveness of intraocular pressure (IOP)-lowering medications in patients with open-angle glaucoma. DESIGN, SETTING, AND PARTICIPANTS Prospective, multicenter, interventional cohort from the prerandomization phase of a randomized clinical trial at multiple ophthalmology clinics.

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Introduction: Cell supplementation to the herniated or degenerated intervertebral disc (IVD) is a potential strategy to promote tissue regeneration and slow disc pathology. Human umbilical cord mesenchymal stromal cells (HUCMSCs) - originating from the Wharton's jelly - remain an attractive candidate for such endeavors with their ability to differentiate into multiple lineages. Previously, mesenchymal stem cells (MSCs) have been studied as a potential source for disc tissue regeneration.

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Tirapazamine (3-amino-1,2,4-benzotriazine-1,4-dioxide) is a promising hypoxia-selective cytotoxin that has shown significant activity in advanced clinical trials in combination with radiotherapy and cisplatin. The current study aimed to advance our understanding of tirapazamine-induced lesions and the pathways involved in their repair. We show that homologous recombination plays a critical role in repair of tirapazamine-induced damage because cells defective in homologous recombination proteins XRCC2, XRCC3, Rad51D, BRCA1, or BRCA2 are particularly sensitive to tirapazamine.

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Purpose: Some patients with nonmalignant systemic diseases, like collagen vascular disease (CVD), hypertension, diabetes mellitus, and inflammatory bowel disease (IBD), tolerate radiation therapy poorly. Although the mechanisms of each of these disease processes are different, they share a common microvessel pathology that is potentially exacerbated by radiotherapy. This article reviews and evaluates available data examining the effects of these benign disease processes on radiation tolerance.

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