Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 42
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
BMC Cancer ; 23(1): 254, 2023 Mar 18.
Artículo en Inglés | MEDLINE | ID: mdl-36932396

RESUMEN

BACKGROUND: The role of neutrophil-lymphocyte ratio (NLR) as a predictor for survival in single fraction SBRT-treated non-small cell lung cancer (NSCLC) patients remains unclear. We performed an observational cohort study to determine the role of pretreatment NLR in predicting survival of early-stage NSCLC patients after single fraction SBRT. METHODS: A single-institution database of peripheral early-stage NSCLC patients treated with SBRT from February 2007 to May 2022 was queried. Optimal threshold of neutrophil-lymphocyte ratio (NLR) was defined based on maximally selected rank statistics. Cox multivariable analysis (MVA), Kaplan-Meier, and propensity score matching were performed to evaluate outcomes. RESULTS: A total of 286 patients were included for analysis with median follow up of 19.7 months. On Cox multivariate analysis, as a continuous variable, NLR was shown to be an independent predictor of OS (adjusted hazards ratio [aHR] 1.06, 95% CI 1.02-1.10, p = 0.005) and PFS (aHR 1.05, 95% CI 1.01-1.09, p = 0.013). In addition, NLR was associated with DF (aHR 1.11, 95% CI 1.05-1.18, p < 0.001). Maximally selected rank statistics determined 3.28 as the cutoff point of high NLR versus low NLR. These findings were confirmed upon propensity matching. CONCLUSIONS: Pretreatment NLR is an independent predictor for survival outcomes of peripheral early-stage NSCLC patients after single fraction SBRT.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Neoplasias Pulmonares , Radiocirugia , Carcinoma Pulmonar de Células Pequeñas , Humanos , Neutrófilos , Pronóstico , Estudios Retrospectivos , Linfocitos
2.
Health Promot Pract ; 23(1): 32-34, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-34414804

RESUMEN

Research has documented the need for mental health services among refugee and immigrant youth. A joint collaboration on a community-based participatory research (CBPR) research project between a university, a local art and health collective, and an immigrant and refugee organization sought to identify and understand the mental health needs and strategies for immigrant youth in Philadelphia through youth discussion and engagement in a variety of art workshops. As a result of the COVID-19 pandemic, this CBPR research project was forced to make several programmatic changes, such as shifting to a virtual setting, that impacted project implementation and intended outcomes. These changes highlight valuable lessons and practical implications in pivoting a program during COVID-19 to continue working with marginalized communities with limited resources, including barriers to technology access, at a time when effectively addressing mental health for immigrant youth has become both more challenging and pressing.


Asunto(s)
COVID-19 , Emigrantes e Inmigrantes , Adolescente , Investigación Participativa Basada en la Comunidad , Humanos , Salud Mental , Pandemias , Philadelphia , SARS-CoV-2
3.
Pak J Pharm Sci ; 35(5): 1307-1319, 2022 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-36451558

RESUMEN

Present study was carried out to analyze the impact of three different monomers on release of losartan potassium from graft polymeric network prepared through free radical polymerization. N, N-methylene bis acrylamide was used as crosslinker and potassium persulfate as initiator. Losartan potassium as used as model drug because, it has very small plasma half-life and wide range of applications as an effective and efficient ARB (Angiotensin II Receptor Blockers) causing lower incidence of side - effects. Influence of three different monomers on swelling and in vitro drug release of the delivery system was evaluated at pH 1.2 and 7.4. The polymeric networks were characterized by Fourier transform infrared spectroscopy, Thermogravimetric analysis and Scanning electron microscopy. Polymeric network prepared with acrylic acid and methacrylic acid showed pH responsive behavior and while acrylamide based nexus exhibited pH independent style in swelling and drug release. However, among all the formulations, maximum swelling ratio (25.86) and optimal prolonged drug release (82.92%) was observed for GG-co-AA (M2) polymeric network at intestinal pH 7.4. The results indicated that GG-co-AA polymeric network could be an impending pH-sensitive drug delivery system for Losartan potassium. (M2) designated as formulation code with varying acrylic acid contents.


Asunto(s)
Antagonistas de Receptores de Angiotensina , Losartán , Inhibidores de la Enzima Convertidora de Angiotensina , Polímeros , Acrilamidas
4.
Pak J Pharm Sci ; 35(2): 409-424, 2022 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-35642395

RESUMEN

The present study was conducted to fabricate and compare pH-sensitive polymeric networks of Artemisia vulgaris- Methacrylic acid using free radical polymerization conventional method and microwave-assisted method. Potassium persulphate and N' N'- Methylene bisacrylamide were employed as an initiator-crosslinker system. Swelling studies were performed at pH 1.2, 4.5, 6.8 and 7.4. Concentrations of polymer and monomer along with radiation dose were optimized as a function of swelling. Porosity and gel fraction were calculated for all samples. FTIR study confirmed the formation of cross-linked networks. Results of SEM indicated that the microwave irradiated polymeric network had a more porous structure. DSC and XRD study indicated the entrapment of drug inside the polymeric networks in amorphous form. In comparison to the conventional method, the polymeric network prepared by the microwave-assisted method exhibited high swelling ratios, porosity, thermal stability and drug release. These results signify microwave radiations as an effective alternative to the conventional heating method.


Asunto(s)
Artemisia , Liberación de Fármacos , Hidrogeles/química , Polímeros/química , Polisacáridos
5.
Pak J Pharm Sci ; 34(3(Supplementary)): 1157-1163, 2021 May.
Artículo en Inglés | MEDLINE | ID: mdl-34602446

RESUMEN

Routinely used anti-inflammatory drugs are associated with off-target effects such as cyclooxygenase (COX)-1 inhibition and gastric ulcers. The aim of this study is to examine the anti-inflammatory potential and gastroprotective effects of synthetic amino acid derivatives of 2-mercaptobenzimidazole (MBAA1, MBAA2, MBAA3, MBAA4 and MBAA5). The results showed that compound MBAA5 possess a potential anti-inflammatory action by inhibition of 15-LOX and COX-2. MBAA5 also attenuated the pro-inflammatory cytokines and mediators (TNF-α, IL-1ß and COX-2) in rat hind paw in carrageenan-induced inflammatory model of rat. 2-mercaptobenzimidazole derivative, MBAA5 also inhibited gastric H+/K+ ATPase and demonstrated a better selectivity index for COX-2 (SI 27.17) in comparison to celecoxib (SI 41.43). Molecular docking studies predicted the binding interactions of the synthesized compounds with retrieved target proteins of H+/K+ ATPase, COX-1, COX-2, and 15-LOX. The results of in silico and molecular docking analysis of amino acid derivatives of 2-mercaptobenzimidazoles further explained their pharmacological activities. Moreover, these compounds presented better antimicrobial activity against three clinical isolates of Helicobacter pylori. Together, our findings suggested that these synthetic 2-mercaptobenzimidazole derivatives are safer therapeutic candidates for inflammation.


Asunto(s)
Aminoácidos/farmacología , Araquidonato 15-Lipooxigenasa/efectos de los fármacos , Bencimidazoles/farmacología , Ciclooxigenasa 2/efectos de los fármacos , Citocinas/efectos de los fármacos , ATPasa Intercambiadora de Hidrógeno-Potásio/efectos de los fármacos , Aminoácidos/química , Animales , Antiinflamatorios no Esteroideos/efectos adversos , Araquidonato 15-Lipooxigenasa/metabolismo , Bencimidazoles/química , Carragenina , Simulación por Computador , Ciclooxigenasa 1/efectos de los fármacos , Ciclooxigenasa 1/metabolismo , Ciclooxigenasa 2/metabolismo , Inhibidores de la Ciclooxigenasa 2/farmacología , Citocinas/metabolismo , ATPasa Intercambiadora de Hidrógeno-Potásio/metabolismo , Helicobacter pylori/efectos de los fármacos , Inflamación/metabolismo , Interleucina-1beta/efectos de los fármacos , Interleucina-1beta/metabolismo , Inhibidores de la Lipooxigenasa/farmacología , Simulación del Acoplamiento Molecular , Ratas , Úlcera Gástrica/inducido químicamente , Factor de Necrosis Tumoral alfa/efectos de los fármacos , Factor de Necrosis Tumoral alfa/metabolismo
6.
Drug Dev Res ; 81(8): 1057-1072, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-32780491

RESUMEN

Benzimidazole is an important pharmacophore for clinically active drugs against inflammation and treatment of pain, however, it is associated with gastrointestinal side effects. Here we synthesized benzimidazole based agents with significant analgesic/anti-inflammatory potential but with less gastrointestinal adverse effects. In this study, we synthesized novel, orally bioavailable 2-mercaptobenzimidazole amino acid conjugates (4a-4o) and screened them for analgesic, anti-inflammatory and gastro-protective effects. The synthesized 2-mercaptbenzimidazole derivatives were characterized for their structure using FTIR, 1 H NMR and 13 C NMR spectroscopic techniques. The 2-mercaptobenzimidazole amino acid conjugates have found to possess potent analgesic, anti-inflammatory and gastroprotective activities, particularly with compound 4j and 4k. Most of the compounds exhibited remarkable anti-ulcer and antisecretory effects. Molecular docking studies were carried out to study the binding affinities and interactions of the synthesized compounds with target proteins COX-2 (PDB ID: 3LN1) and H+ /K+ -ATPase (PDB ID: 5Y0B). Our results support the clinical promise of these newly synthesized 2-mercaptobezimidazol conjugates as a component of therapeutic strategies for inflammation and analgesia, for which the gastric side effects are always a major limitation.

7.
Issues Ment Health Nurs ; 41(1): 49-53, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31398068

RESUMEN

Background: Identifying depressive cognitions in first-generation Middle Eastern immigrants (FGMEI) can be an important step to prevent the development of clinical depression.Purpose: This study focused on the cross-cultural equivalence and psychometric testing of the Arabic version of the Positive Thinking Skills Scale (A-PTSS) among 100 FGMEI.Methods: Content/face validity of the measure was conducted. Internal consistency, homogeneity, dimensionality and construct validity were assessed.Results: Cronbach's alpha for (A-PTSS) was .89. Factor extraction generated only one factor, which is consistent with the English version. The A-PTSS total score had a strong positive correlation with the positive cognition scores (r = .42, p < .001), the total resourcefulness scores (r = .39, p < .001), and with the total generalized anxiety scores (r = -.42, p < .001), thereby suggesting construct validity.Conclusion: This scale has the potential to become a useful screening tool for depressive cognitions among FGMEI.


Asunto(s)
Comparación Transcultural , Emigrantes e Inmigrantes/psicología , Optimismo/psicología , Psicometría , Adulto , Ansiedad/diagnóstico , Depresión/diagnóstico , Femenino , Humanos , Masculino , Persona de Mediana Edad , Medio Oriente/etnología , Reproducibilidad de los Resultados , Encuestas y Cuestionarios , Pensamiento , Traducciones , Wisconsin/epidemiología
8.
Pak J Pharm Sci ; 33(1(Supplementary)): 269-279, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-32122858

RESUMEN

The main objective of the present study was to explore the potential of matrix tablets as extended release dosage form of tianeptine, using HMPC K100 as a polymer. HPMC K100 extended the release of the drug from formulation due to the gel-like structure. Direct compression method was adopted to compress the tablets using different concentrations of polymer. Tablets were evaluated for pre-compression and post-compression parameters. Drug release study showed that tablet extends the release of drug with the increasing concentration of polymer. Drug, polymers and tablets were analyzed and/or characterized for compatibility, degradation, thermal stability, amorphous or crystalline nature via FTIR, DSC, TGA, XRD studies. SEM study predicted that tablets had a uniform structure. HPMC K100 based tablets were similar to that of the reference product. Acute toxicity study conducted on Swiss albino mice showed that matrix tablets were safe and non-toxic, as no changes in physical activity and functions of organs were observed. Biochemical and histopathological study revealed lack of any kind of abnormality in liver and renal function. Moreover, necrotic changes were absent at organ level.


Asunto(s)
Antidepresivos Tricíclicos/síntesis química , Antidepresivos Tricíclicos/toxicidad , Química Farmacéutica/métodos , Tiazepinas/síntesis química , Tiazepinas/toxicidad , Pruebas de Toxicidad Aguda/métodos , Animales , Preparaciones de Acción Retardada/síntesis química , Preparaciones de Acción Retardada/toxicidad , Femenino , Derivados de la Hipromelosa/síntesis química , Derivados de la Hipromelosa/toxicidad , Metilcelulosa/síntesis química , Metilcelulosa/toxicidad , Ratones , Comprimidos
9.
Pak J Pharm Sci ; 33(2(Supplementary)): 839-845, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32863260

RESUMEN

In the present study, we synthesized silver (Ag) nanoparticles using aqueous extracts of clove (Syzygium aromaticum) (SAE). This synthesis of green silver nanoparticles (AgNP) was a novel and effectual tool against the Newcastle Viral Disease (NDV). Syzygium aromaticum extract was used as reducing and stabilizing agent for synthesis of silver nanoparticles. AgNP were characterized using diversity of biophysical methods inclusive of Fourier transform infrared spectroscopy (FTIR), UV-VIS spectroscopy and Transmission electron microscopy (TEM) for morphology and size. Furthermore, XRD analysis confirmed the crystalline nature of the particles. In current investigations, the antiviral activity of clove buds silver nanoparticles was inspected in-vitro and in-ovo. Embryonated chicken eggs were used to perform the cytotoxicity assay of the clove extract silver nanoparticles (CESN). CESN showed in vitro antiviral activity against NDV in embryonated eggs.


Asunto(s)
Antivirales/farmacología , Nanopartículas del Metal/administración & dosificación , Extractos Vegetales/farmacología , Plata/farmacología , Syzygium/química , Animales , Pollos , Tecnología Química Verde/métodos , Enfermedad de Newcastle/tratamiento farmacológico , Virus de la Enfermedad de Newcastle/efectos de los fármacos , Espectroscopía Infrarroja por Transformada de Fourier/métodos , Agua/química
11.
Curr Pharm Des ; 30(1): 48-62, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38155469

RESUMEN

Nanotechnology has emerged as the eminent focus of today's research to overcome challenges related to conventional drug delivery systems. A wide spectrum of novel delivery systems has been investigated to improve the therapeutic outcomes of drugs. The polymer-based nanocomposite hydrogels (NCHs) that have evolved as efficient carriers for controlled drug delivery are of particular interest in this regard. Nanocomposites amalgamate the properties of both nanoparticles (NPs) as well as hydrogels, exhibiting superior functionalities over conventional hydrogels. This multiple functionality is based upon advanced mechanical, electrical, optical as well as magnetic properties. Here is a brief overview of the various types of nanocomposites, such as NCHs based on Carbon-bearing nanomaterials, polymeric nanoparticles, inorganic nanoparticles, and metal and metal-oxide NPs. Accordingly, this article will review numerous ways of preparing these NCHs with particular emphasis on the vast biomedical applications displayed by them in numerous fields such as tissue engineering, drug delivery, wound healing, bioprinting, biosensing, imaging and gene silencing, cancer therapy, antibacterial therapy, etc. Moreover, various features can be tuned, based on the final application, by controlling the chemical composition of hydrogel network, which may also influence the released conduct. Subsequently, the recent work and future prospects of this newly emerging class of drug delivery system have been enlisted.


Asunto(s)
Sistemas de Liberación de Medicamentos , Polímeros , Humanos , Nanogeles , Disponibilidad Biológica , Polímeros/química , Hidrogeles/química
12.
Cancers (Basel) ; 16(4)2024 Feb 12.
Artículo en Inglés | MEDLINE | ID: mdl-38398146

RESUMEN

We investigated the survival and patterns of failure in adenocarcinoma (ADC) and squamous cell carcinoma (SCC) in early stage non-small cell lung cancer (NSCLC) treated with single-fraction stereotactic body radiation therapy (SF-SBRT) of 27-34 Gray. A single-institution retrospective review of patients with biopsy-proven early stage ADC or SCC undergoing definitive SF-SBRT between September 2008 and February 2023 was performed. The primary outcomes were overall survival (OS) and disease-free survival (DFS). The secondary outcomes included local failure (LF), nodal failure (NF), and distant failure (DF). Of 292 eligible patients 174 had adenocarcinoma and 118 had squamous cell carcinoma. There was no significant change in any outcome except distant failure. Patients with ADC were significantly more likely to experience distant failure than patients with SCC (p = 0.0081). In conclusion, while SF-SBRT produced similar LF, NF, DFS, and OS, the higher rate of distant failure in ADC patients suggests that ongoing trials of SBRT and systemic therapy combinations should report their outcomes by histology.

13.
Pract Radiat Oncol ; 14(1): e40-e47, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-37804882

RESUMEN

PURPOSE: Our purpose was to evaluate the clinical consequences of sinoatrial node (SAN) and atrioventricular node (AVN) irradiation in patients undergoing stereotactic body radiation therapy (SBRT) for central non-small cell lung cancer (NSCLC) tumors. METHODS AND MATERIALS: A single-institutional retrospective review of patients with primary NSCLC undergoing definitive SBRT for centrally located thoracic tumors from February 2007 to December 2021 was performed. The SAN and AVN were contoured in accordance with a published contouring atlas, and the maximum dose (Dmax) and mean dose (Dmean) for each structure were calculated. Sequential log rank testing between the 50th and 90th percentiles was used to identify potential cutoff values for the corresponding dosimetric parameters and overall survival. RESULTS: Among 93 eligible patients, the median age was 72.5 years (IQR, 66.6-78.3), and median follow-up was 32.4 months (IQR, 13.0-49.6). The median SAN Dmax and Dmean were 95 cGy (range, 9-5394) and 58 cGy (range, 7-3168), respectively. The median AVN Dmax and Dmean were 45 cGy (range, 4-2121) and 34 cGy (range, 3-1667), respectively. Candidate cutoff values for SAN Dmax and Dmean were 1309 and 836 cGy, respectively. No associations between AVN parameters and survival outcomes were identified. Upon multivariate Cox regression, the SAN Dmax cutoff (hazard ratio [HR], 2.03 [1.09-3.79]; P = .026) and SAN Dmean cutoff (HR, 2.22 [1.20-4.12]; P = .011) were significantly associated with overall survival. For noncancer-associated survival, the SAN Dmax cutoff trended toward significance (HR, 2.02 [0.89-4.57]; P = .092), and the SAN Dmean cutoff remained significantly associated (HR, 2.34 [1.05-5.18]; P = .037). CONCLUSIONS: For patients undergoing SBRT for NSCLC, SAN Dmax and Dmean were significantly associated with worse overall survival using cut-off values of 1309 and 836 cGy, respectively. Further studies examining the effect of SAN irradiation during SBRT are warranted.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Neoplasias Pulmonares , Radiocirugia , Humanos , Anciano , Carcinoma de Pulmón de Células no Pequeñas/cirugía , Radiocirugia/métodos , Nodo Sinoatrial , Dosificación Radioterapéutica
14.
PLoS One ; 19(5): e0302657, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38787908

RESUMEN

Ethnopharmacological relevance of Saussurea species for anti-cancer compounds instigated us to develop chemotherapeutic herbal tablets. This study was an ongoing part of our previous research based on the scientific evaluation of Saussurea heteromalla (S. heteromalla) for anti-cancer lead compounds. In the current study, S. heteromalla herbal tablets (500 /800 mg) were designed and evaluated for anti-cancer activity. Arctigenin was found as a bioactive lead molecule with anti-cancer potential for cervical cancer. The in vitro results on the HeLa cell line supported the ethnopharmacological relevance and traditional utilization of S. heteromalla and provided the scientific basis for the management of cervical cancer as proclaimed by traditional practitioners in China. LD50 of the crude extract was established trough oral acute toxicity profiling in mice, wherein the minimum lethal dose was noticed as higher than 1000 mg/kg body weight orally. Chromatographic fingerprint analysis ensured the identity and consistency of S. heteromalla in herbal tablets in terms of standardization of the herbal drug. About 99.15% of the drug (S. heteromalla crude extract) was recovered in herbal tablets (RSD: 0.45%). In vitro drug release profile was found to be more than 87% within 1 h, which was also correlated with different mathematical kinetic models of drug release (r2 = 0.992), indicating that drug release from matrix tablets into the blood is constant throughout the delivery. The dosage form was found stable after an accelerated stability parameters study which may be used for anti-cervical cancer therapy in the future, if it qualifies successful preclinical investigation parameters.


Asunto(s)
Extractos Vegetales , Saussurea , Saussurea/química , Animales , Humanos , Ratones , Células HeLa , Extractos Vegetales/química , Extractos Vegetales/toxicidad , Extractos Vegetales/farmacología , Lignanos/farmacología , Lignanos/química , Femenino , Furanos/toxicidad , Furanos/química , Furanos/farmacología , Comprimidos , Antineoplásicos Fitogénicos/farmacología , Antineoplásicos Fitogénicos/química , Masculino , Antineoplásicos/farmacología , Antineoplásicos/química , Dosificación Letal Mediana , Pruebas de Toxicidad Aguda , Medicamentos Herbarios Chinos/química , Medicamentos Herbarios Chinos/toxicidad , Medicamentos Herbarios Chinos/farmacología
15.
Gels ; 9(7)2023 Jul 12.
Artículo en Inglés | MEDLINE | ID: mdl-37504446

RESUMEN

A hydrogel topical patch of neomycin was developed by using sodium alginate (SA) and hydroxyethylcellulose (HEC) as polymers. Free radical polymerization in an aqueous medium was initiated by using acrylic acid (AA) and N,N'-methylenebisacrylamide (MBA). Prepared hydrogels were characterized for pH sensitivity and sol-gel analysis. In addition, the effect of reactant contents on the developed formulation was evaluated by swelling behavior. SEM assay showed the rough structure of the hydrogel-based polymeric matrix, which directly enhances the ability to uptake fluid. FTIR spectra revealed the formation of a new polymeric network between reactant contents. TGA and DSC verified that fabricated polymeric patches were more thermodynamically stable than pure components. Gel fractions increased with increases in polymer, monomer, and cross-linker contents. The swelling study showed the pH-dependent swelling behavior of patches at pH 5.5, 6.5, and 7.4. The release pattern of the drug followed zero-order kinetics, with diffusion-controlled drug release patterns according to the Korsmeyer-Peppas (KP) model. Ex vivo studies across excised rabbit skin verified the drug retention in the skin layers. The hydrogel patch effectively healed the wounds produced on the rabbit skin, whereas the formulation showed no sign of irritation on intact skin. Therefore, neomycin hydrogel patches can be a potential candidate for controlled delivery for efficient wound healing.

16.
PLoS One ; 18(8): e0290223, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37607173

RESUMEN

Prime objective of the current research was to develop a stable nimesulide emulgel with the help of arabinoxylan, a natural gelling agent extracted from Plantago ovata. The response surface methodology was used by a Design Expert 10 software to formulate and optimize the emulgel. The experimental design approach evaluated the impact of independent and dependent variables. Independent variables were different concentrations of arabinoxylan, span 80 and tween 20, whereas, dependent variables were viscosity, pH, and content uniformity. FTIR demonstrated the compatibility of nimesulide with the excipients. Stability study indicated no phase separation and no change in pH for formulation F1, F3 and F4. The negative values of zeta potential revealed the excellent stability of emulgel. Viscosity, spreadability and extrudability values were in desired range. Ex-vivo permeation study illustrated 86%, 55% and 66% release of the drug over a period of 24 h from the formulations F1, F3 and F4, respectively. Analgesic effect of the optimized emulgel was significantly higher in test group as compared to control and did not produce any sort of irritation. Therefore, it can be concluded that the newly developed emulgel based on arabinoxylan, as gelling agent, appear to be an effective drug delivery system.


Asunto(s)
Plantago , Excipientes , Movimiento Celular , Geles
17.
Pract Radiat Oncol ; 13(3): e246-e253, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36581198

RESUMEN

PURPOSE: The objective of this study was to evaluate the incidence of brachial plexus injury (BPI) after single-fraction stereotactic body radiation therapy (SBRT) to apical lung tumors. METHODS AND MATERIALS: A retrospective cohort analysis was performed of all patients treated with single-fraction lung SBRT at our institution from 2007 to 2022. Apical tumors were identified as those with an epicenter located above the arch of the aorta. Dosimetric analysis of dose to the brachial plexus (BP) was done using both the subclavian vessel (SCV) surrogate structure and anatomic BP. BPI was assessed per Common Terminology Criteria for Adverse Events, version 4.0, as regional paresthesia, marked discomfort and muscle weakness, and limited movement of the arm or hand. RESULTS: A total of 45 patients met inclusion criteria with median follow-up of 21 months. There were 9 patients who exceeded the BP dose constraint using the SCV or anatomic BP volume. Only 1 patient (2.2%) developed grade 2 BPI, occurring 7 months after SBRT. Dose to the anatomic BP for the affected patient was 26.39 Gy. For the entire cohort, the median SCV and anatomic maximum BP doses were 8.44 and 7.14 Gy, respectively. CONCLUSIONS: There is considerable variability in dose delivered to the BP after SBRT to apical lung tumors. BPI after single-fraction SBRT to apical tumors is rare and rates are comparable with those reported with multifraction regimens.


Asunto(s)
Neuropatías del Plexo Braquial , Neoplasias Pulmonares , Radiocirugia , Humanos , Estudios Retrospectivos , Radiocirugia/efectos adversos , Radiocirugia/métodos , Dosificación Radioterapéutica , Neoplasias Pulmonares/patología , Neuropatías del Plexo Braquial/etiología
18.
Gels ; 9(6)2023 Jun 08.
Artículo en Inglés | MEDLINE | ID: mdl-37367144

RESUMEN

The present study was conducted to fabricate and characterize mucilage-based polymeric networks of Aloe vera for controlled drug release. Aloe vera mucilage was used to develop a polymeric network via the free-radical polymerization method using potassium persulphate as the initiator, N' N'-Methylene bisacrylamide as the crosslinker, and acrylamide as the monomer. Using varying concentrations of Aloe vera mucilage, crosslinker, and monomer, we developed different formulations. Swelling studies were conducted at pH 1.2 and 7.4. Concentrations of polymer, monomer, and crosslinker were optimized as a function of swelling. Porosity and gel content were calculated for all samples. FTIR, SEM, XRD, TGA, and DSC studies were conducted for the characterization of polymeric networks. Thiocolchicoside was used as a model drug to study the in vitro release in acidic and alkaline pH. Various kinetics models were applied by using a DD solver. Increasing content of monomer and crosslinker swelling, porosity, and drug release decreased while gel content increased. An increase in Aloe vera mucilage concentration promotes swelling, porosity, and drug release of the polymeric network but decreases gel content. The FTIR study confirmed the formation of crosslinked networks. SEM indicated that the polymeric network had a porous structure. DSC and XRD studies indicated the entrapment of drugs inside the polymeric networks in amorphous form. The analytical method was validated according to ICH guidelines in terms of linearity, range, LOD, LOQ, accuracy, precision, and robustness. Analysis of drug release mechanism revealed Fickian behavior of all formulations. All these results indicated that the M1 formulation was considered to be the best polymeric network formulation in terms of sustaining drug release patterns.

19.
Cancers (Basel) ; 15(6)2023 Mar 08.
Artículo en Inglés | MEDLINE | ID: mdl-36980533

RESUMEN

BACKGROUND: The treatment of early-stage non-small cell lung cancer (NSCLC) with stereotactic body radiation therapy (SBRT) frequently involves different fractionation schemes for peripheral and central tumors due to concerns with toxicity. We performed an observational cohort study to determine survival outcomes for patients with peripheral and central NSCLC treated with SBRT. METHODS: A single-institutional database of patients with early-stage NSCLC treated with SBRT from September 2008 to December 2018 was evaluated. Outcomes were progression-free survival (PFS), overall survival (OS), local failure (LF), nodal failure (NF), and distant failure (DF). Cox multivariable analysis (MVA), Kaplan-Meier plotting, Fine-Gray competing risk MVA, and propensity score matching were performed. RESULTS: A total of 265 patients were included with a median follow-up of 44.2 months. There were 191 (72%) and 74 (28%) patients with peripheral and central tumors treated with single-fraction SBRT to a dose of 27 Gy and five-fraction SBRT to a dose of 50 Gy, respectively. On Cox MVA, there was no difference in OS (adjusted hazards ratio (aHR) of 1.04, 95% CI of 0.74-1.46) or PFS (aHR of 1.05, 95% CI of 0.76-1.45). On Fine-Gray competing risk MVA, there were no differences in LF, NF, or DF. Propensity matching confirmed these findings. CONCLUSION: The survival outcomes of patients treated with SBRT for early-stage NSCLC were equivalent for central and peripheral tumors.

20.
Cureus ; 15(9): e44621, 2023 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-37799254

RESUMEN

Background Serum prostate-specific antigen (PSA) is a well-established marker that can be measured as an indicator for screening, diagnosing, and managing prostate cancer due to its advanced tissue specificity. Numerous studies have revealed that free PSA is the predominant molecular form of PSA in breast cancer cases. In contrast, total PSA is prevalent in benign breast tumor cases and healthy females. This case-control study aims to measure PSA levels among individuals with breast cancer in order to establish PSA as a prognostic biomarker. Methods The study involved 150 female subjects between the ages of 18 and 70 and was conducted between 2013 and 2014. The subjects were then categorized into three groups: those with malignant breast cancer, those with benign breast tumors, and the control group with no history of malignant or benign breast tumors. Participants were asked to complete a lifestyle questionnaire and interview using hospital medical records to establish past and pertinent patient medical history. These cases were acquired from the 7th of October Hospital's surgery department and Benghazi Central Hospital's oncology clinic in Libya. Sandwich-type ELISA's were used for PSA quantitation, while the Wilcoxon Rank-Sum test was used to identify statistically significant differences between total PSA and free PSA measurements within each patient group. Results This study did not reveal significant statistical differences in total PSA levels between breast cancer cases and control groups (p=0.200), or between breast cancer and fibroadenoma patients (p=0.472). However, there was a significant difference in F-PSA levels between breast cancer and fibroadenoma cases (p=0.0001). Neither total-PSA (p=0.200) nor F-PSA (p=0.262) levels showed significant differences between breast cancer cases and controls. This study paved the way for further investigations into PSA's role in breast cancer. Despite its limitations, it offers an opportunity to delve deeper into understanding PSA's potential role and use in breast cancer. Conclusion A comprehensive statistical analysis revealed a positive correlation between F-PSA levels and breast cancer diagnosis. The findings suggest that PSA may serve as a prognostic biomarker for breast cancer. This may contribute to improved customized treatment approaches, offering precise and accurate risk assessments, understanding breast cancer biology, and improving health outcomes for patients with breast cancer.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA