Time filter

Source Type

Houston, TX, United States

Mohiuddin M.M.,UT Medical School at Houston | Nichols E.M.,University of Maryland Baltimore County | Marter K.J.,University of Maryland Baltimore County | Flannery T.W.,Princeton Radiology
Medical Dosimetry

To determine whether small field boost (SFB) replanning is necessary when the lumpectomy cavity (LPC) decreases during whole-breast irradiation (WBI) and what parameters might predict a change in the SFB plan. Forty patients had computed tomography (CT) simulation (CT1) within 60 days of surgery and were resimulated (CT2) after 37.8-41.4 Gy for SFB planning. A 3-field photon plan and a single en face electron plan were created on both CTs and compared. In the 26 patients who had a ≥5 cm3 and a ≥25% decrease in lumpectomy cavity volume (LCV) between CT scans, the SFB plan using photons was different in terms of normal breast tissue volume irradiated (BTV) (p < 0.001), and field dimensions (p < 0.001). In 20/35 patients, the energy or field size changed for electron plans on CT2, but no tested characteristics predicted for a change. Less BTV was irradiated using electrons than photons in 29% (CT1) to 37% (CT2). SFB replanning needs to be individualized to each patient because of the variety of factors that can impact dosimetric planning. Replanning is recommended when using 3-field photons if the patient has experienced a ≥5 cm3 and a ≥25% decrease in LCV during WBI. Some patients may benefit from electron SFB replanning but no tested characteristics reliably predict those who may benefit the most. The amount of BTV irradiated is less with electrons than in photon plans and this has the potential to improve cosmesis, a clinically important outcome in breast-conserving therapy. © 2012 American Association of Medical Dosimetrists. Source

El-Serag H.B.,Michael bakey Veterans Affairs Medical Center | Hollier J.M.,Baylor College of Medicine | Alsarraj A.,Michael bakey Veterans Affairs Medical Center | Younes M.,UT Medical School at Houston
Diseases of the Esophagus

Human papillomavirus (HPV) is strongly associated with squamous esophageal cancer. The potential role of HPV in Barrett's esophagus (BE) has been examined but remains unclear. The aim of the study was to determine the prevalence of HPV in esophageal and gastric tissues obtained from patients with and without BE. We designed a cross-sectional study was conducted with prospective enrollment of eligible patients scheduled for esophagogastroduodenoscopy (EGD). All participants had biopsies of endoscopic BE, squamous-lined esophagus, and stomach. Immunohistochemistry (IHC) on formalin-fixed and paraffin-embedded tissue was conducted using monoclonal antibodies. Polymerase chain reaction (PCR) for HPV was performed on DNA extracted from esophageal biopsies snapped frozen within 30 minutes after endoscopic capture. The Roche HPV Linear Array Assay with PGMY primers that has high sensitivity for detecting 37 types of HPV was used. A total of 127 subjects were included: 39 with definitive BE had IHC done on samples from non-dysplastic BE, squamous esophagus, gastric cardia, and gastric body; and 88 control patients without BE had IHC done on squamous esophageal samples, gastric cardia, and gastric body. HPV was not detected in any of the samples in either group. For confirmation, HPV DNA PCR was performed on randomly selected samples from 66 patients (both esophagus and BE from 13 patients with BE, and 53 esophagus from patients without BE); no sample had HPV DNA detected via PCR in the presence of adequate quality control. HPV infection does not play a role in the formation of non-dysplastic Barrett's esophagus in men in the United States. © 2012 the Authors Journal compilation © 2012, Wiley Periodicals, Inc. and the International Society for Diseases of the Esophagus. Source

Canfield S.E.,UT Medical School at Houston | Dahm P.,University of Florida
World Journal of Urology

Objectives: Urologists can benefit from a standardized system for guideline development and presentation. This article introduces the GRADE system and explains how it may be useful for Urologic physicians, in their practice and in their healthcare systems. Methods: The GRADE system is reviewed. Specific aspects of how GRADE rates the quality of the evidence and the strength of recommendations are explored. Results: GRADE can provide explicit and structured guidance, which separates the quality of evidence from the strength of recommendations. This information can be used by consumers of guidelines, including patients, physicians, and policy makers. Conclusions: Urologists can benefit from a more transparent and rigorous framework when formulating recommendations. GRADE is an emergent proposal with broader implications for healthcare policy as well. © 2011 Springer-Verlag. Source

Fan C.,Central South University | Zheng Y.,UT Medical School at Houston | Cheng X.,UT Medical School at Houston | Qi X.,UT Medical School at Houston | And 5 more authors.
International Journal of Biological Sciences

The transplantation of neural stem/progenitor cells is a promising therapeutic strategy for spinal cord injury (SCI). In this study, we tested whether combination of neurotrophic factors and transplantation of glial-restricted precursor (GRPs)-derived astrocytes (GDAs) could decrease the injury and promote functional recovery after SCI. We developed a protocol to quickly produce a sufficiently large, homogenous population of young astrocytes from GRPs, the earliest arising progenitor cell population restricted to the generation of glia. GDAs expressed the axonal regeneration promoting substrates, laminin and fibronectin, but not the inhibitory chondroitin sulfate proteoglycans (CSPGs). Importantly, GDAs or its conditioned medium promoted the neurite outgrowth of dorsal root ganglion neurons in vitro. GDAs were infected with retroviruses expressing EGFP or multi-neurotrophin D15A and transplanted into the contused adult thoracic spinal cord at 8 days post-injury. Eight weeks after transplantation, the grafted GDAs survived and integrated into the injured spinal cord. Grafted GDAs expressed GFAP, suggesting they remained astrocyte lineage in the injured spinal cord. But it did not express CSPG. Robust axonal regeneration along the grafted GDAs was observed. Furthermore, transplantation of D15A-GDAs significantly increased the spared white matter and decreased the injury size compared to other control groups. More importantly, transplantation of D15A-GDAs significantly improved the locomotion function recovery shown by BBB locomotion scores and Tredscan footprint analyses. However, this combinatorial strategy did not enhance the aberrant synaptic connectivity of pain afferents, nor did it exacerbate posttraumatic neuropathic pain. These results demonstrate that transplantation of D15A-expressing GDAs promotes anatomical and locomotion recovery after SCI, suggesting it may be an effective therapeutic approach for SCI. © Ivyspring International Publisher. Source

Gorbatiy V.,UT Medical School at Houston | Gorbatiy V.,University of Texas M. D. Anderson Cancer Center | Westney O.L.,UT Medical School at Houston | Westney O.L.,University of Texas M. D. Anderson Cancer Center | And 4 more authors.
Journal of Sexual Medicine

Introduction.: Synchronous implantation of an inflatable penile prosthesis (IPP) and a bulbourethral sling single via a single perineal is a unique approach in managing erectile dysfunction and stress urinary incontinence. Aim.: This article describes our surgical approach and reviews the operative time, length of hospital stay (LOS), estimated blood loss (EBL), and cost of synchronous dual prosthetic implantation compared with the implants performed individually. Additionally, we review the short-term outcomes in patients with dual sling and penile prosthesis synchronous implants. Methods.: Fifty-eight patients with IPP, 53 slings, and eight simultaneous dual implantations between January 2000 and July 2008 were retrospectively reviewed. Operative times, EBL, length of stay, cost, and complications were compared in three groups (group 1, IPP; group 2, slings; group 3, dual implants). Additionally, we reviewed pre- and postoperative Sexual Health Inventory for Men (SHIM) scores and pad use in group 3. Main Outcome Measures.: Review of operative times, EBL, LOS, cost, and complications. Results.: Dual implantation had similar operative times compared with the total time for the individual procedures (98 ± 24 minutes for IPP; 86 ± 24 minutes for sling; 177 ± 17 minutes for dual implant, P > 0.05). EBL was reduced (57 ± 30 mL for IPP; 48 ± 59 mL for sling; 49 ± 5 mL for group 3). LOS was also reduced (1.2 ± 0.45 days for IPP, 0.7 ± 0.48 days for sling; and 1.1 ± 0.50 days for dual implant). Dual implantation was associated with approximately $9,000 in savings. With a mean follow-up of 13.6 months, group 3 reported SHIM increase from 1.3 ± 0.5 to 23.5 ± 0.6 and a decrease in pad use from three pads per day (range 2-6) down to a mean of one pad per day (range 0-2). One sling erosion and one sling infection occurred in group 2. One patient in group 3 had acute urinary retention resolved with 5 days of catheter drainage. Conclusion.: Dual penile prosthesis and bulbourethral sling implantation through a single perineal incision is safe, efficient, and cost-effective. © 2009 International Society for Sexual Medicine. Source

Discover hidden collaborations