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1.
J Surg Res ; 278: 233-239, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-35636198

RESUMEN

INTRODUCTION: Multidisciplinary tumor boards (TBs) are crucial for decision-making and management of patients diagnosed with complex malignancies. The social distancing conditions imposed by coronavirus disease 2019 presented an opportunity to compare virtual versus in-person TBs. METHODS: A retrospective analysis of attendance data from an National Cancer Institute-designated cancer center's gastrointestinal (GI) TB participant data from September 2019 to October 2020. In addition, an online survey assessing the virtual TB experience was sent to participants of all TBs. Interrupted time series analyses were performed to evaluate preintervention and postintervention GI TB attendance only. RESULTS: The overall mean attendance for GI TB was 30 participants; turnout was higher for virtual format compared to in-person (32 versus 23 attendees, P < 0.001). This increase was seen across all participant categories: attending physicians (15 versus 11 attendees, P < 0.001), trainees (11 versus 8, P < 0.001), and support staff (6 versus 3, P < 0.001). There was no significant difference in the mean number of cases discussed between TB formats. The majority of the 141 survey respondents (across all TB) were attending physicians with >20-year experience. Most supported a permanent virtual or hybrid TB format, 72.5% found this format to be more time efficient and with similar productivity, and 85.8% found it easier to attend. The majority (89.9%) felt confident that the decision-making process was not affected by virtual interactions. CONCLUSIONS: A virtual platform for multispecialty TBs allows for greater attendance without sacrificing the decision-making process. This survey supports continuing with a virtual or hybrid format, which may increase attendance and facilitate access to multidisciplinary discussions leading to improved patient care.


Asunto(s)
COVID-19 , Neoplasias , Personal de Salud , Humanos , Neoplasias/terapia , Estudios Retrospectivos , Encuestas y Cuestionarios
2.
Melanoma Res ; 32(2): 79-87, 2022 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-35254330

RESUMEN

Both BRAF/MEK targeted agents and immunotherapy are approved for the treatment of advanced melanoma. BRAF testing is recommended at the time of advanced melanoma diagnosis. In addition, little is known regarding the treatment trends for patients with BRAF mutated tumors. This investigation aims to assess the real-world prevalence of molecular testing and treatment trends for patients with BRAF mutated tumors. Using a de-identified database, patients of age ≥18 years with advanced melanoma from 2013 to 2018 were examined. Molecular testing performed within 3 months of advanced diagnosis was considered to have the test performed at the time of diagnosis. Test prevalence was calculated and compared in groups stratified by the patient, tumor and treatment factors. In total 4459 patients were included; 1936 (43.4%) stage III, 1191 (26.7%) stage IV and 1332 (29.9%) recurrent. Totally 50.4% of patients received systemic treatment; 76.4% stage IV, 71% recurrent patients and 26.7% stage III patients. However, 73.5% received first-line immunotherapy. In total 73.8% of patients had molecular testing, and 50.5% had tested at the time of advanced diagnosis. Of those tested 42% had a BRAF mutated tumor. In total 48% of these patients received first-line immunotherapy whereas 43% received a BRAF inhibitor, with increasing immunotherapy use seen over time. The majority of patients with advanced melanoma undergo molecular testing at the time of advanced diagnosis. Immunotherapy is the most commonly prescribed treatment regardless of BRAF mutational status. These results provide real-world data on the frequency of molecular testing and treatment trends for patients with advanced melanoma.


Asunto(s)
Melanoma , Neoplasias Cutáneas , Adolescente , Humanos , Inmunoterapia , Melanoma/tratamiento farmacológico , Melanoma/genética , Melanoma/patología , Terapia Molecular Dirigida , Mutación , Proteínas Proto-Oncogénicas B-raf/genética , Proteínas Proto-Oncogénicas B-raf/uso terapéutico , Neoplasias Cutáneas/tratamiento farmacológico , Neoplasias Cutáneas/genética , Neoplasias Cutáneas/patología
3.
Melanoma Res ; 32(2): 112-119, 2022 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-35213415

RESUMEN

Tumor mutational burden (TMB) has recently been identified as a biomarker of response to immune checkpoint inhibitors in many cancers, including melanoma. Co-assessment of TMB with inflammatory markers and genetic mutations may better predict disease outcomes. The goal of this study was to evaluate the potential for TMB and somatic mutations in combination to predict the recurrence of disease in advanced melanoma. A retrospective review of 85 patients with stage III or IV melanoma whose tumors were analyzed by next-generation sequencing was conducted. Fisher's exact test was used to assess differences in TMB category by somatic mutation status as well as recurrence locations. Kaplan-Meier estimates and Cox-proportional regression model were used for survival analyses. The most frequently detected mutations were TERT (32.9%), CDKN2A (28.2%), KMT2 (25.9%), BRAF V600E (24.7%), and NRAS (24.7%). Patients with TMB-L + BRAFWT status were more likely to have a recurrence [hazard ratio (HR), 3.43; confidence interval (CI), 1.29-9.15; P = 0.01] compared to TMB-H + BRAF WT. Patients with TMB-L + NRASmut were more likely to have a recurrence (HR, 5.29; 95% CI, 1.44-19.45; P = 0.01) compared to TMB-H + NRAS WT. TMB-L tumors were associated with local (P = 0.029) and in-transit (P = 0.004) recurrences. Analysis of TMB alone may be insufficient in understanding the relationship between melanoma's molecular profile and the body's immune system. Classification into BRAFmut, NRASmut, and tumor mutational load groups may aid in identifying patients who are more likely to have disease recurrence in advanced melanoma.


Asunto(s)
Melanoma , Neoplasias Cutáneas , Biomarcadores de Tumor/genética , Humanos , Melanoma/patología , Mutación , Recurrencia Local de Neoplasia/genética , Proteínas Proto-Oncogénicas B-raf/genética , Neoplasias Cutáneas/patología
4.
Eur J Surg Oncol ; 48(6): 1356-1361, 2022 06.
Artículo en Inglés | MEDLINE | ID: mdl-35016837

RESUMEN

BACKGROUND: Multiple neoadjuvant therapy protocols have been proposed in the treatment of pancreatic adenocarcinoma, including chemotherapy (CT), chemoradiation (CRT), and total neoadjuvant therapy (TNT), defined as a CT plus CRT. A pathologic complete response (pCR) can be achieved in a minority of cases. We hypothesize that TNT is more likely to confer pCR than other neoadjuvant therapies, which may improve overall survival (OS). METHODS: A retrospective review of the National Cancer Database (NCDB) from 2006 to 2016 was performed, identifying patients who underwent any neoadjuvant therapy followed by definitive pancreatic resection for locally advanced or borderline resectable pancreatic adenocarcinoma. A pathologic complete response was defined as down-staging from any clinical stage to pathologic stage 0. RESULTS: A total of 5402 patients who received neoadjuvant therapy followed by resection were identified. 177 patients (3.3%) achieved a pCR. Of the patients who achieved a pCR, 57 received CT, 41 CRT and 79 received TNT. On multivariate analysis, TNT was more likely to confer a pCR than CRT (OR 1.67, CI 1.13-2.46, p = 0.0103) or CT (OR 2.61, CI 1.83-3.71, p < 0.0001). Patients who achieved pCR had a significantly higher OS, with median survival of 64.9 months, compared to 21.6 months in patients who did not achieve pCR (p < 0.0001). CONCLUSION: TNT may be more likely to achieve a pCR than CT or CRT. Patients who achieve a pCR have a significant OS benefit as compared to those who have residual disease. TNT should be considered for patients requiring neoadjuvant therapy, as it may increase the likelihood of achieving a pCR, thus potentially improving OS.


Asunto(s)
Adenocarcinoma , Neoplasias Pancreáticas , Adenocarcinoma/terapia , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Quimioradioterapia , Humanos , Terapia Neoadyuvante/métodos , Neoplasias Pancreáticas/patología , Probabilidad , Estudios Retrospectivos , Neoplasias Pancreáticas
5.
Breast Cancer Res Treat ; 191(3): 513-522, 2022 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-35013916

RESUMEN

PURPOSE: Breast cancer outcomes are impaired by both delays and disparities in treatment. This study was performed to assess their relationship and to provide a tool to predict patient socioeconomic factors associated with risk for delay. METHODS: The National Cancer Database was reviewed between 2004 and 2017 for patients with non-metastatic breast cancer managed with upfront surgery. Times to treatment were measured from the date of diagnosis. Patient, tumor, and treatment factors were assessed with attention paid to sociodemographic variables. RESULTS: 514,187 patients remained after exclusions, with 84.3% White, 10.8% Black, 3.7% Asian, and Hispanics comprising 5.6% of the cohort. Medicaid and uninsured patients had longer mean adjusted time to surgery (≥ 46 days) versus private (36.7 days), Medicare (35.9 days), or other governmental insurance (39.8 days). After adjustment, Black race and Hispanic ethnicity were most impactful, adding 6.0 and 6.4 preoperative days, 10.9 and 11.5 days to chemotherapy, 11.1 and 9.1 days to radiation, and 12.5 and 8.9 days to endocrine therapy, respectively. Income, education, and insurance, among other factors, also affected delay. A nomogram, including race and sociodemographic factors, was created to predict the risk of preoperative delay. CONCLUSION:  Significant disparities exist in timeliness of care for factors, including but not limited to, race and ethnicity. Although exact causes cannot be discerned, these data indicate population subsets whose intervals of care risk being longer than those specified by national quality standards. The nomogram created here may help direct resources to those at highest risk of incurring a treatment delay.


Asunto(s)
Neoplasias de la Mama , Anciano , Neoplasias de la Mama/epidemiología , Neoplasias de la Mama/cirugía , Etnicidad , Femenino , Disparidades en Atención de Salud , Humanos , Medicare , Factores Socioeconómicos , Estados Unidos/epidemiología
6.
Urol Oncol ; 40(3): 95-102, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-34876350

RESUMEN

PURPOSE: Opioids are prescribed excessively following surgery. As many urologic oncology procedures are performed minimally invasively, an opportunity exists to push forward initiatives to minimize postoperative opioid use. MATERIALS AND METHODS: A quality improvement initiative to reduce inpatient opioid prescribing was launched at a tertiary cancer center. In Phase I (December 2019-July 2020), providers were instructed to start standing acetaminophen. In Phase II (beginning August 2020), education was provided to the entire care team and ordersets were modified to an opioid sparing protocol (OSP). We analyzed the proportion of minimally invasive surgery (MIS) prostatectomy and nephrectomy patients that adhered to an OSP during each phase and compared them to controls from the preceding 2 years. RESULTS: A total of 303, 153, and 839 patients underwent MIS during the Phase I, Phase II, and control periods respectively. The proportion of patients adhering to an OSP increased from 16% at the beginning of Phase I to 76% at the end of Phase II (p-trend < 0.001). The median total oral morphine equivalents for oral opioids declined from 20 mg and 40 mg at baseline for prostatectomy and nephrectomy patients respectively to 0 mg for both groups (p-trends < 0.001). Multivariable analysis found that patients received 22% and 81% less oral morphine equivalents during Phase I and II respectively compared to the control period (P < 0.001). CONCLUSIONS: Adherence to an OSP is most effective when initiatives incorporate the entire team and are supported by nudge theory-based structural changes. Using these strategies, most patients following urologic MIS can dramatically reduce opioid use postoperatively.


Asunto(s)
Analgésicos Opioides , Morfina , Analgésicos Opioides/uso terapéutico , Cognición , Humanos , Masculino , Dolor Postoperatorio , Pautas de la Práctica en Medicina
7.
Ann Surg Oncol ; 29(3): 1683-1691, 2022 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-34635974

RESUMEN

BACKGROUND: Surgical delays are associated with invasive cancer for patients with ductal carcinoma in situ (DCIS). During the Severe Acute Respiratory Syndrome-Coronavirus-2 (SARS-CoV-2) pandemic, neoadjuvant endocrine therapy (NET) was used as a bridge until postponed surgeries resumed. This study sought to determine the impact of NET on the rate of invasive cancer for patients with a diagnosis of DCIS who have a surgical delay compared with those not treated with NET. METHODS: Using the National Cancer Database, the study identified women with hormone receptor-positive (HR+) DCIS. The presence of invasion on final pathology was evaluated after stratifying by receipt of NET and by intervals based on time from diagnosis to surgery (≤30, 31-60, 61-90, 91-120, or 121-365 days). RESULTS: Of 109,990 women identified with HR+ DCIS, 276 (0.3%) underwent NET. The mean duration of NET was 74.4 days. The overall unadjusted rate of invasive cancer was similar between those who received NET ((15.6%) and those who did not (12.3%) (p = 0.10). In the multivariable analysis, neither the use nor the duration of NET were independently associated with invasion, but the trend across time-to-surgery categories demonstrated a higher rate of upgrade to invasive cancer in the no-NET group (p < 0.001), but not in the NET group (p = 0.97). CONCLUSIONS: This analysis of a pre-COVID cohort showed evidence for a protective effect of NET in HR+ DCIS against the development of invasive cancer as the preoperative delay increased, although an appropriately powered prospective trial is needed for a definitive answer.


Asunto(s)
Neoplasias de la Mama , COVID-19 , Carcinoma Ductal de Mama , Carcinoma Intraductal no Infiltrante , Neoplasias de la Mama/tratamiento farmacológico , Neoplasias de la Mama/epidemiología , Neoplasias de la Mama/cirugía , Carcinoma Ductal de Mama/tratamiento farmacológico , Carcinoma Ductal de Mama/epidemiología , Carcinoma Ductal de Mama/cirugía , Carcinoma Intraductal no Infiltrante/tratamiento farmacológico , Carcinoma Intraductal no Infiltrante/epidemiología , Carcinoma Intraductal no Infiltrante/cirugía , Femenino , Humanos , Terapia Neoadyuvante , Pandemias , Estudios Prospectivos , SARS-CoV-2
8.
J Surg Res ; 267: 203-208, 2021 11.
Artículo en Inglés | MEDLINE | ID: mdl-34153563

RESUMEN

BACKGROUND: Tumor infiltrating lymphocytes (TILs) and regression are thought to be distinct markers of the immune response to melanoma. OBJECTIVE: This study sought to analyze the relationship of TIL grade and presence of regression to each other and to other prognostic histopathologic and clinical values in melanoma. MATERIALS AND METHODS: A retrospective analysis was conducted using patients diagnosed with melanoma between 2013 and 2019 whose complete histopathologic reports were available. RESULTS: Regression was seen in 48.9%, 30.1% and 37.9% of patients with brisk, non-brisk, and absent TILs respectively (P=0.019). Melanoma tumors with brisk TILs were found to have a lower Breslow thickness than those with non-brisk or absent (P= 0.001). Tumors with regression were also found to have lower Breslow thickness (P<0.001). Neither TIL grade nor regression were protective of nodal metastasis or associated with improved survival. CONCLUSION: Brisk TILs have a positive association with thinner tumors and the presence of tumor regression relative to non-brisk or absent TILs. This may suggest a more robust immune response in tumors with brisk TILs. Further exploration of the interplay between TIL grade, lymphocyte cell subtype and lymphocyte density may help explain this finding.


Asunto(s)
Melanoma , Neoplasias Cutáneas , Humanos , Linfocitos Infiltrantes de Tumor , Melanoma/patología , Pronóstico , Estudios Retrospectivos , Neoplasias Cutáneas/patología
9.
JCO Clin Cancer Inform ; 5: 125-133, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-33492994

RESUMEN

PURPOSE: Performance status (PS) is a subjective assessment of patients' overall health. Quantification of physical activity using a wearable tracker (Fitbit Charge [FC]) may provide an objective measure of patient's overall PS and treatment tolerance. MATERIALS AND METHODS: Patients with colorectal cancer were prospectively enrolled into two cohorts (medical and surgical) and asked to wear FC for 4 days at baseline (start of new chemotherapy [± 4 weeks] or prior to curative resection) and follow-up (4 weeks [± 2 weeks] after initial assessment in medical and postoperative discharge in surgical cohort). Primary end point was feasibility, defined as 75% of patients wearing FC for at least 12 hours/d, 3 of 4 assigned days. Mean steps per day (SPD) were correlated with toxicities of interest (postoperative complication or ≥ grade 3 toxicity). A cutoff of 5,000 SPD was selected to compare outcomes. RESULTS: Eighty patients were accrued over 3 years with 55% males and a median age of 59.5 years. Feasibility end point was met with 68 patients (85%) wearing FC more than predefined duration and majority (91%) finding its use acceptable. The mean SPD count for patients with PS 0 was 6,313, and for those with PS 1, it was 2,925 (122 and 54 active minutes, respectively) (P = .0003). Occurrence of toxicity of interest was lower among patients with SPD > 5,000 (7 of 33, 21%) compared with those with SPD < 5,000 (14 of 43, 32%), although not significant (P = .31). CONCLUSION: Assessment of physical activity with FC is feasible in patients with colorectal cancer and well-accepted. SPD may serve as an adjunct to PS assessment and a possible tool to help predict toxicities, regardless of type of therapy. Future studies incorporating FC can standardize patient assessment and help identify vulnerable population.


Asunto(s)
Neoplasias Colorrectales , Monitores de Ejercicio , Neoplasias Colorrectales/cirugía , Ejercicio Físico , Estudios de Factibilidad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Complicaciones Posoperatorias
10.
Am J Surg ; 222(1): 99-103, 2021 07.
Artículo en Inglés | MEDLINE | ID: mdl-33189309

RESUMEN

BACKGROUND: The COVID crisis hit during the interview season for the Complex General Surgical Oncology (CGSO) fellowship. With minimal time to adapt, all programs transitioned to virtual interviews. Here we describe the experience of both program directors (PDs) and candidates with virtual interviews, and provide guidelines for implementation based on the results. METHODS: Surveys regarding interview day specifics and perceptions were created for CGSO fellowship PDs and candidates. They were distributed at the conclusion of the season, prior to match. RESULTS: Thirty (94%) PDs and 64 (79%) candidates responded. Eighty-three% of PDs and 79% of candidates agreed or strongly agreed that they felt comfortable creating a rank list. If given the choice, 60% of PDs and 45% of candidates would choose virtual interviews over in-person interviews. The majority of candidates found PD overviews, fellows only sessions and pre-interview materials helpful. CONCLUSION: Overall, the majority of PDs and candidates felt comfortable creating a rank list; however, more PDs preferred virtual interviews for the future. Our results also confirm key components of a virtual interview day.


Asunto(s)
Internado y Residencia/organización & administración , Satisfacción Personal , Selección de Personal/métodos , Oncología Quirúrgica/educación , Telecomunicaciones/organización & administración , Adulto , COVID-19/epidemiología , COVID-19/prevención & control , Control de Enfermedades Transmisibles/normas , Femenino , Humanos , Internado y Residencia/métodos , Internado y Residencia/estadística & datos numéricos , Masculino , Pandemias/prevención & control , Selección de Personal/organización & administración , Selección de Personal/normas , Selección de Personal/estadística & datos numéricos , Cirujanos/psicología , Cirujanos/estadística & datos numéricos , Oncología Quirúrgica/organización & administración , Oncología Quirúrgica/normas , Encuestas y Cuestionarios/estadística & datos numéricos , Telecomunicaciones/normas , Telecomunicaciones/estadística & datos numéricos
11.
J Surg Educ ; 78(1): 321-323, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-32741692

RESUMEN

The coronavirus crisis hit at the beginning of the Complex General Surgical Oncology Fellowship (CGSO) and Breast Oncology Fellowship interview cycles. Within 2 weeks, nearly all programs, including ours, switched to a virtual platform for the remainder of the season. Given that social distancing will remain in place for the foreseeable future, it is possible that all residency and fellowship interviews will need to be conducted virtually. Our methods and shared experience can assist other programs faced with this task for their upcoming interview cycle. We recommend using a virtual meeting platform in which staff have the most comfort; we chose Zoom as our platform. Information on the program traditionally included in the welcome packet, research opportunities, details on the institution, hospital and staff, and detailed interview instructions were distributed prior to the interview day. A virtual "happy hour" was conducted to provide an opportunity for candidates and current trainees to interact. Our virtual interview day schedule mimicked our traditional in person interview day, and we always had a back-up plan for completing the interview if the virtual platform became unstable. While many programs would not choose to perform virtual interviews, we felt that by conducting them in the methods we describe, we were able to closely replicate our traditional interview day and appreciate the candidacy of the applicants.


Asunto(s)
COVID-19/epidemiología , Entrevistas como Asunto , Distanciamiento Físico , Oncología Quirúrgica/educación , Comunicación por Videoconferencia , Educación de Postgrado en Medicina , Becas , Humanos , Internado y Residencia , Pandemias , Pennsylvania/epidemiología , SARS-CoV-2
12.
Urol Case Rep ; 33: 101396, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-33102094

RESUMEN

Colonic adenocarcinoma of a urinary diversion is rare. We report a case of a 70 year-old woman who developed such a malignancy 12 years after creation of an Indiana pouch urinary diversion for treatment of urothelial carcinoma of the bladder cancer.

13.
J Biol Chem ; 295(8): 2212-2226, 2020 02 21.
Artículo en Inglés | MEDLINE | ID: mdl-31919100

RESUMEN

The genus Flavivirus in the family Flaviviridae comprises many medically important viruses, such as dengue virus (DENV), Zika virus (ZIKV), and yellow fever virus. The quest for therapeutic targets to combat flavivirus infections requires a better understanding of the kinetics of virus-host interactions during infections with native viral strains. However, this is precluded by limitations of current cell-based systems for monitoring flavivirus infection in living cells. In the present study, we report the construction of fluorescence-activatable sensors to detect the activities of flavivirus NS2B-NS3 serine proteases in living cells. The system consists of GFP-based reporters that become fluorescent upon cleavage by recombinant DENV-2/ZIKV proteases in vitro A version of this sensor containing the flavivirus internal NS3 cleavage site linker reported the highest fluorescence activation in stably transduced mammalian cells upon DENV-2/ZIKV infection. Moreover, the onset of fluorescence correlated with viral protease activity. A far-red version of this flavivirus sensor had the best signal-to-noise ratio in a fluorescent Dulbecco's plaque assay, leading to the construction of a multireporter platform combining the flavivirus sensor with reporter dyes for detection of chromatin condensation and cell death, enabling studies of viral plaque formation with single-cell resolution. Finally, the application of this platform enabled the study of cell-population kinetics of infection and cell death by DENV-2, ZIKV, and yellow fever virus. We anticipate that future studies of viral infection kinetics with this reporter system will enable basic investigations of virus-host interactions and facilitate future applications in antiviral drug research to manage flavivirus infections.


Asunto(s)
Infecciones por Flavivirus/virología , Flavivirus/metabolismo , Genes Reporteros , Proteínas no Estructurales Virales/metabolismo , Animales , Muerte Celular , Línea Celular , Virus del Dengue/metabolismo , Fluorescencia , Proteínas Fluorescentes Verdes/metabolismo , Humanos , Cinética , Relación Señal-Ruido , Virus Zika/metabolismo
14.
Biophys J ; 117(5): 844-855, 2019 09 03.
Artículo en Inglés | MEDLINE | ID: mdl-31427065

RESUMEN

Caspases are an important protease family that coordinate inflammation and programmed cell death. Two closely related caspases, caspase-3 and caspase-7, exhibit largely overlapping substrate specificities. Assessing their proteolytic activities individually has therefore proven extremely challenging. Here, we constructed an outer membrane protein G (OmpG) nanopore with a caspase substrate sequence DEVDG grafted into one of the OmpG loops. Cleavage of the substrate sequence in the nanopore by caspase-7 generated a characteristic signal in the current recording of the OmpG nanopore that allowed the determination of the activity of caspase-7 in Escherichia coli cell lysates. Our approach may provide a framework for the activity-based profiling of proteases that share highly similar substrate specificity spectrums.


Asunto(s)
Proteínas de la Membrana Bacteriana Externa/química , Caspasa 7/metabolismo , Proteínas de Escherichia coli/química , Escherichia coli/citología , Nanoporos , Porinas/química , Caspasa 8/metabolismo
15.
Biochemistry ; 58(6): 776-787, 2019 02 12.
Artículo en Inglés | MEDLINE | ID: mdl-30472839

RESUMEN

The dengue virus protease (NS2B-NS3pro) plays a critical role in the dengue viral life cycle, making it an attractive drug target for dengue-related pathologies, including dengue hemorrhagic fever. A number of studies indicate that NS2B-NS3pro undergoes a transition between two widely different conformational states: an "open" (inactive) conformation and a "closed" (active) conformation. For the past several years, the equilibrium between these states and the resting conformation of NS2B-NS3pro have been debated, although a strong consensus is emerging. To investigate the importance of such conformational states, we developed versions of NS2B-NS3pro that allow us to trap the enzyme in various distinct conformations. Our data from these variants suggest that the enzymatic activity appears to be dependent on the movement of NS2B and may rely on the flexibility of the protease core. Locking the enzyme into the "closed" conformation dramatically increased activity, strongly suggesting that the "closed" conformation is the active conformation. The observed resting state of the enzyme depends largely on the construct used to express the NS2B-NS3pro complex. In an "unlinked" construct, in which the NS2B and NS3 regions exist as independent, co-expressed polypeptides, the enzyme rests predominantly in a "closed", active conformation. In contrast, in a "linked" construct, in which NS2B and NS3 are attached by a nine-amino acid linker, NS2B-NS3pro adopts a more relaxed, alternative conformation. Nevertheless, even the unlinked construct samples both the "closed" and other alternative conformations. Given our findings, and the more realistic resemblance of NS2B-NS3pro to the native enzyme, these data strongly suggest that studies should focus on the "unlinked" constructs moving forward. Additionally, the results from these studies provide a more detailed understanding of the various poses of the dengue virus NS2B-NS3 protease and should help guide future drug discovery efforts aimed at this enzyme.


Asunto(s)
Cisteína/química , Virus del Dengue/enzimología , Disulfuros/química , Serina Endopeptidasas/química , Proteínas no Estructurales Virales/química , Ácido Ditionitrobenzoico/química , Escherichia coli/genética , Docilidad , Conformación Proteica , Inhibidores de Serina Proteinasa/química , Sulfonas/química , Proteínas no Estructurales Virales/antagonistas & inhibidores
16.
ACS Chem Biol ; 13(9): 2398-2405, 2018 09 21.
Artículo en Inglés | MEDLINE | ID: mdl-30080377

RESUMEN

Zika virus is an emerging mosquito-borne pathogen capable of severely damaging developing fetuses as well as causing neurological abnormalities in adults. The molecular details of how Zika virus causes pathologies that are unique among the flavivirus family remain poorly understood and have contributed to the lack of Zika antiviral therapies. To elucidate how Zika virus protease (ZVP) affects host cellular pathways and consequent pathologies, we used unbiased N-terminomics to identify 31 human proteins cleaved by the NS2B-NS3 protease. In particular, autophagy-related protein 16-1 (ATG16L1) and eukaryotic translation initiation factor 4 gamma 1 (eIF4G1) are dramatically depleted during Zika virus infection. ATG16L1 and eIF4G1 mediate type-II interferon production and host-cell translation, respectively, likely aiding immune system evasion and driving the Zika life cycle. Intriguingly, the NS2B cofactor region from Zika virus protease is essential for recognition of host cell substrates. Replacing the NS2B region in another flavivirus protease enabled recognition of novel Zika-specific substrates by hybrid proteases, suggesting that the cofactor is the principal determinant in ZVP substrate selection.


Asunto(s)
Proteínas Relacionadas con la Autofagia/metabolismo , Factor 4G Eucariótico de Iniciación/metabolismo , Péptido Hidrolasas/metabolismo , Proteínas no Estructurales Virales/metabolismo , Infección por el Virus Zika/metabolismo , Virus Zika/fisiología , Humanos , Modelos Moleculares , Péptido Hidrolasas/química , Conformación Proteica , Proteínas/metabolismo , Proteolisis , Proteínas no Estructurales Virales/química , Virus Zika/química , Virus Zika/enzimología , Infección por el Virus Zika/patología
17.
JAMA Surg ; 153(12): 1105-1110, 2018 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-30140927

RESUMEN

Importance: Most states have adopted the routine use of a prescription drug monitoring program (PDMP) to curb overprescribing of opioids. The American College of Surgeons promotes the use of these programs as a "guiding principle to curb the opioid epidemic." However, there is a paucity of data on the effects of the use of these programs for surgical patient populations. Objective: To determine the association of the mandatory use of a PDMP with the opioid prescribing practices for patients undergoing general surgery. Design, Setting, and Participants: A prospective observational cohort study was conducted at an academic hospital in New Hampshire among 1057 patients undergoing representative elective general surgical procedures from July 1, 2016, to June 30, 2017. Exposures: New state legislation mandated the use of a PDMP and opioid risk-assessment tool for all patients receiving an outpatient opioid prescription in New Hampshire beginning January 1, 2017. The electronic medical prescribing system was modified to facilitate and support compliance with the new requirements. Main Outcomes and Measures: Change in opioid prescribing practices after January 1, 2017, and time to complete PDMP requirements. Results: Among the 1057 patients (569 women [53.8%] and 488 men [46.2%]; mean [SD] age, 56.8 [15.4] years), the percentage of patients prescribed opioids after surgery did not decrease significantly (429 of 536 [80.0%] before the new requirements vs 401 of 521 [77.0%] after the requirements; P = .29). The mean number of opioid pills prescribed decreased from 30.8 to 24.0 (22.1%) in the 6 months prior to the mandatory PDMP requirement; the rate of decrease was actually less (from 22.8 to 21.9 pills [3.9%]) in the 6 months after the legislation. These new requirements did not identify any high-risk patients who subsequently were not prescribed opioids. The query and opioid abuse risk calculator together took a median time of 7 minutes (range, 2-17 minutes) to complete. Conclusions and Relevance: A mandatory PDMP query requirement was not significantly associated with the overall rate of opioid prescribing or the mean number of pills prescribed for patients undergoing general surgical procedures. In no cases was a high-risk patient identified, leading to avoidance of an opioid prescription. A PDMP can be a useful adjunct in certain settings, but this study found that it did not have the intended effect in a population undergoing elective surgical procedures. Legislative efforts to mandate PDMP use should be targeted to populations in which benefit can be demonstrated.


Asunto(s)
Analgésicos Opioides/uso terapéutico , Procedimientos Quirúrgicos Electivos/estadística & datos numéricos , Pautas de la Práctica en Medicina/estadística & datos numéricos , Programas de Monitoreo de Medicamentos Recetados/estadística & datos numéricos , Prescripciones de Medicamentos/normas , Cirugía General/estadística & datos numéricos , Humanos , Dolor Postoperatorio/tratamiento farmacológico , Mal Uso de Medicamentos de Venta con Receta/prevención & control , Estudios Prospectivos
18.
J Surg Res ; 229: 283-287, 2018 09.
Artículo en Inglés | MEDLINE | ID: mdl-29937003

RESUMEN

BACKGROUND: Surgery for anorectal diseases is thought to cause significant pain postoperatively. There is little known regarding standardized opioid-prescribing trends and patient use following surgery for anorectal diseases. We aimed to evaluate and analyze opioid-prescribing trends and patient use for outpatient anorectal operations. MATERIALS AND METHODS: All patients who underwent outpatient anorectal surgery performed over a 1-y period at a single institution were eligible. Procedures included hemorrhoidectomy, anal fistula repair/seton, anal fissure treatment with sphincterotomy, and transanal excision of rectal tumors. Demographic, operative, and postoperative data were obtained. Patients were given a survey to determine postoperative pain control with opioid and non-narcotic analgesia use; respondents were included in analysis. RESULTS: Forty-two outpatient anorectal surgery patients were included: 13 had hemorrhoidectomy, 22 had anal fistula repair/seton, one had sphincterotomy, and six had transanal excisions. All patients had multimodality treatment with either an anal block and/or postoperative nonopioid analgesics. Ninety percent were prescribed opioids postoperatively with a median of 20 pills (range: 0-120 pills). Forty-three percent (18/42) did not fill their prescription. For those who used opioids, the median number of pills taken was four. Eighty percent of pills prescribed were not used. One patient required a refill. Greater than 60% of respondents reported good to excellent pain control on a five-point scale. CONCLUSIONS: Most patients had adequate pain control after anorectal surgery with little to no use of opioids and that more than 80% of opioid pills prescribed were not consumed. We intend to standardize our prescribing opioid quantities for outpatient anorectal operations to reflect this reduced use.


Asunto(s)
Procedimientos Quirúrgicos Ambulatorios/efectos adversos , Analgésicos Opioides/uso terapéutico , Procedimientos Quirúrgicos del Sistema Digestivo/efectos adversos , Manejo del Dolor/estadística & datos numéricos , Dolor Postoperatorio/tratamiento farmacológico , Pautas de la Práctica en Medicina/estadística & datos numéricos , Enfermedades del Recto/cirugía , Procedimientos Quirúrgicos Ambulatorios/métodos , Analgésicos no Narcóticos/uso terapéutico , Analgésicos Opioides/efectos adversos , Procedimientos Quirúrgicos del Sistema Digestivo/métodos , Prescripciones de Medicamentos/estadística & datos numéricos , Femenino , Humanos , Masculino , Trastornos Relacionados con Opioides/etiología , Trastornos Relacionados con Opioides/prevención & control , Manejo del Dolor/métodos , Dimensión del Dolor , Dolor Postoperatorio/diagnóstico , Dolor Postoperatorio/etiología , Medicamentos bajo Prescripción/efectos adversos , Medicamentos bajo Prescripción/uso terapéutico , Estudios Retrospectivos , Encuestas y Cuestionarios/estadística & datos numéricos , Resultado del Tratamiento
19.
J Am Coll Surg ; 226(6): 996-1003, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29198638

RESUMEN

BACKGROUND: There is a paucity of data to inform appropriate opioid prescribing for patients who are discharged after a hospital admission for a surgical procedure. STUDY DESIGN: We studied 333 inpatients discharged to home after bariatric, benign foregut, liver, pancreas, ventral hernia, and colon surgery. Chronic opioid users or patients who had complications were excluded. Home opioid usage was quantified in 90% of the remaining patients by questionnaires and phone surveys. RESULTS: Eighty-five percent of patients were prescribed an opioid and 38% of prescribed opioid pills were taken. Fifteen opioid pills satisfied the opioid needs of 88% of patients discharged on postoperative day (POD) 1. For patients discharged after POD 1, in multivariate analysis, the number of opioid pills used at home was associated with the number taken the day before discharge (p < 0.0001) and patient age (p = 0.006), but not the type of surgery. Forty-one percent of patients took no opioids the day before discharge, 33% took 1 to 3, and 26% took more than 4 pills. Eighty-five percent of patients' home opioid requirements would be satisfied using the following guideline: if no opioid pills are taken the day before discharge, no prescription is needed; if 1 to 3 opioid pills are taken the day before discharge, then a prescription for 15 opioid pills is given at discharge; and if 4 or more pills are taken the day before discharge, then a prescription for 30 opioid pills is given at discharge. If these guidelines were used, the number of opioid pills prescribed would decrease by 40%. CONCLUSIONS: For patients admitted after surgical procedures, post-discharge opioid use is best predicted by usage the day before discharge. Use of this guideline could decrease opioid prescriptions substantially and effectively treat patients' pain.


Asunto(s)
Analgésicos Opioides/administración & dosificación , Guías como Asunto , Dolor Postoperatorio/tratamiento farmacológico , Alta del Paciente , Pautas de la Práctica en Medicina/estadística & datos numéricos , Procedimientos Quirúrgicos Operativos , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Manejo del Dolor/métodos , Encuestas y Cuestionarios
20.
J Surg Res ; 221: 167-172, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-29229124

RESUMEN

BACKGROUND: Complicated diverticulitis is associated with a postoperative mortality rate of 20%. We hypothesized that age ≥80 was an independent risk factor for mortality after Hartmann's procedure for diverticular disease when controlling for baseline comorbidities. METHODS: Patients who underwent an urgent or emergent Hartmann's procedure (Current Procedural Terminology codes 44143 and 44206) for diverticular disease (International Classification of Diseases-9:562.xx) were identified using the American College of Surgeons National Surgical Quality Improvement Project 2005-2013 user file. Using propensity score matching to control for baseline comorbidities, a group of patients ≥80 years old was matched to a group of those <80 years old. Univariate and multivariable logistic regression were performed. A P value <0.05 was considered statistically significant with a confidence interval (CI) of 95%. RESULTS: From a total of 2986 patients, 464 patients (15.5%) were ≥80 years old. Two groups of 284 patients in each study arm were matched using propensity-matching. The mean age of the ≥80 group and <80 group was 84.4 ± 3.3 versus 63.77 ± 911.8; P < 0.0001, respectively. There was no statistical difference in baseline comorbidities or operative time between the groups. There was a significant difference in mortality with 19% and 9.2% in the >80 group versus <80 groups, respectively (P = 0.001). Factors associated with mortality included ascites (odds ratio [OR] 4.95, confidence interval [CI] 1.64-14.93, P = 0.005), previous cardiac surgery (OR 3.68, CI 1.46-9.26, P = 0.006), partially dependent or fully dependent functional status (OR 2.51, CI 1.12-5.56, P = 0.02), albumin <3 (OR 2.49, CI 1.18-5.29, P = 0.01), and American Society of Anesthesiologist class >3 (OR 2.10, CI 1.10-4.46, P = 0.05). CONCLUSIONS: Octogenarians presenting with complicated diverticulitis requiring an emergent Hartmann's procedure have a higher mortality rate compared to those <80, even after controlling for baseline comorbidities. STUDY TYPE: This is a retrospective, descriptive study.


Asunto(s)
Colectomía/mortalidad , Diverticulitis del Colon/cirugía , Factores de Edad , Anciano , Anciano de 80 o más Años , Colectomía/métodos , Diverticulitis del Colon/mortalidad , Tratamiento de Urgencia/mortalidad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Puntaje de Propensión , Estados Unidos/epidemiología
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