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1.
Mod Pathol ; 37(1): 100353, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37844869

RESUMO

Neoadjuvant treatment of non-small cell lung cancer challenges the traditional processing of pathology specimens. Induction therapy before resection allows evaluation of the efficacy of neoadjuvant agents at the time of surgery. Many clinical trials use pathologic tumor response, measured as major pathologic response (MPR, ≤10% residual viable tumor [RVT]) or complete pathologic response (CPR, 0% RVT) as a surrogate of clinical efficacy. Consequently, accurate pathologic evaluation of RVT is crucial. However, pathologic assessment has not been uniform, which is particularly true for sampling of the primary tumor, which instead of the traditional processing, requires different tissue submission because the focus has shifted from tumor typing alone to RVT scoring. Using a simulation study, we analyzed the accuracy rates of %RVT, MPR, and CPR of 31 pretreated primary lung tumors using traditional grossing compared with the gold standard of submitting the entire residual primary tumor and identified the minimum number of tumor sections to be submitted to ensure the most accurate scoring of %RVT, MPR, and CPR. Accurate %RVT, MPR, and CPR calls were achieved in 52%, 87%, and 81% of cases, respectively, using the traditional grossing method. Accuracy rates of at least 90% for these parameters require either submission of all residual primary tumor or at least 20 tumor sections. Accurate %RVT, MPR, and CPR scores cannot be achieved with traditional tumor grossing. Submission of the entire primary tumor, up to a maximum of 20 sections, is required for the most accurate reads.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Neoplasias Pulmonares , Humanos , Neoplasias Pulmonares/cirurgia , Neoplasias Pulmonares/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/cirurgia , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Terapia Neoadjuvante/métodos , Pulmão/patologia , Resultado do Tratamento
2.
Cell ; 139(7): 1226-8, 2009 Dec 24.
Artigo em Inglês | MEDLINE | ID: mdl-20064369

RESUMO

Circulating tumor cells are responsible for seeding metastatic growth at distant sites. Kim et al. (2009) now discover that circulating tumor cells can reinfiltrate tumors at their primary organs and promote tumor progression.


Assuntos
Inoculação de Neoplasia , Neoplasias/patologia , Células Neoplásicas Circulantes/patologia , Animais , Progressão da Doença , Humanos , Neoplasias/fisiopatologia
3.
Gynecol Oncol ; 168: 76-82, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36423446

RESUMO

OBJECTIVE: Selinexor is a first-in-class, oral selective inhibitor of nuclear export (SINE) compound which blocks Exportin-1 (XPO1). Our objective was to determine maximum tolerated dose (MTD) and recommended phase II dose (RP2D) of selinexor and weekly paclitaxel. METHODS: This was an open label, single-center, multi-arm phase 1b study utilizing a "3 + 3" design and a "basket-type" expansion in recurrent solid tumors. Selinexor (60 mg or 80 mg twice weekly orally) and weekly paclitaxel (80 mg IV 2 week on, 1 week off) were one of 13 parallel arms. Efficacy was evaluated using RECIST version 1.1. RESULTS: All 35 patients treated were evaluable for toxicity and 31 (88%) were evaluable for response. Patient diagnoses included platinum-resistant/refractory ovarian (n = 28), breast (n = 4), prostate (n = 2), and cervical (n = 1) cancer. Patients had a median of four prior therapies (range 1-10), and 47% had a prior taxane in the recurrent setting. There were no DLTs and 60 mg was chosen as the RP2D due to long-term tolerability. Ninety-seven percent of patients had at least one treatment-emergent adverse event (TEAE), and the most common grade ≥ 3 TEAE were neutropenia (46%), anemia (31%), and nausea (21%). Among 24 evaluable patients with ovarian cancer, response rate was 17%, CBR was 58%, and median PFS was 6.8 months (95% CI 3.7, not reached (NR)). CONCLUSIONS: Oral selinexor in combination with weekly paclitaxel demonstrated promising clinical activity with manageable toxicity. This combination should be considered for further exploration in a randomized study, especially in ovarian malignancies.


Assuntos
Segunda Neoplasia Primária , Neoplasias Ovarianas , Masculino , Humanos , Feminino , Paclitaxel , Recidiva Local de Neoplasia/tratamento farmacológico , Recidiva Local de Neoplasia/etiologia , Neoplasias Ovarianas/etiologia , Hidrazinas , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos
4.
Eur Arch Psychiatry Clin Neurosci ; 273(4): 995-1005, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36422679

RESUMO

Movement abnormalities, including movement slowing and irregular muscle contraction, exist in individuals with psychotic-like experiences (PLEs) and serve as vulnerable factors of developing psychotic diseases in the psychosis continuum. To date scarce studies have developed early intervention programs tackling these initial impairments, which may be caused by basal ganglia alterations, in the early stage of the psychosis course. Rhythmic auditory stimulation (RAS) is a technique of neurological music therapy and has been proved effective in inducing faster movements in patients with psychotic diseases. This pilot study examined if RAS incorporated in functional movement training reduced severity of movement slowing and irregular muscle contraction in individuals with PLEs. Seventeen individuals with PLEs were randomly allocated to receiving RAS or receiving no RAS and underwent daily 40-min movement training (picking up beans) for three weeks. This study used motion analysis to measure movement performance at pretest and posttest. Eighteen age- and gender-matched individuals without PLEs were also recruited to provide data of intact movements. Results showed that RAS may reduce severity of movement slowing and irregular muscle contraction in individuals with PLEs. This pilot study is one of the pioneering studies validating effectiveness of early intervention programs tackling movement abnormalities, which are initial impairments in the psychosis continuum, in individuals with PLEs.


Assuntos
Transtornos Psicóticos , Humanos , Estimulação Acústica , Projetos Piloto , Transtornos Psicóticos/terapia , Inquéritos e Questionários
5.
Breast Cancer Res Treat ; 186(3): 871-882, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33575859

RESUMO

PURPOSE: Metastatic phyllodes tumors of the breast (MPT) are rare breast neoplasms, limiting development of standardized treatment approaches. We sought to characterize the largest group of MPT thus far reported, evaluating systemic therapy outcomes. METHODS: Adult patients diagnosed with MPT between 1993 and 2015 and followed at MD Anderson Cancer Center were selected for retrospective chart review. Systemic therapy was sorted into: adriamycin/ifosfamide (AI), other anthracycline regimens, other ifosfamide regimens, gemcitabine-based regimens, and other. Given one patient may have received more than one regimen, we assumed that the effects of each regimen were independent from previous therapy. Median overall survival (OS) and progression-free survival (PFS) were estimated by the Kaplan-Meier method. Log-rank test was performed to evaluate the difference in OS between patient characteristics groups, and the differences in PFS between the five chemotherapy regimens. RESULTS: We identified 50 MPT patients, with 31 patients receiving 61 systemic regimens. Median OS was 10.7 months (95% CI: 8.67, 16.5). AI had a PFS of 9.10 months (95% CI: 5.03, 14.2), other ifosfamide regimens had a PFS of 5.10 months (95% CI: 0.67, 12.1), other anthracycline regimens had a PFS of 3.65 months (95% CI: 1.17, 7.90), gemcitabine-based regimens had a PFS of 2.80 months (95% CI: 1.83, 4.60), and other regimens had a PFS of 1.67 months (95% CI: 1.13, 7.77). CONCLUSION: MPT patients are a unique population with limited characterization to date. Our study demonstrates activity of multiple sarcoma-directed chemotherapy regimens, with ifosfamide-containing regimens having the longest PFS.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica , Neoplasias da Mama , Adulto , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Mama , Neoplasias da Mama/tratamento farmacológico , Intervalo Livre de Doença , Feminino , Humanos , Estimativa de Kaplan-Meier , Estudos Retrospectivos , Resultado do Tratamento
6.
Nature ; 510(7503): 167-71, 2014 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-24739973

RESUMO

Centrosome amplification has long been recognized as a feature of human tumours; however, its role in tumorigenesis remains unclear. Centrosome amplification is poorly tolerated by non-transformed cells and, in the absence of selection, extra centrosomes are spontaneously lost. Thus, the high frequency of centrosome amplification, particularly in more aggressive tumours, raises the possibility that extra centrosomes could, in some contexts, confer advantageous characteristics that promote tumour progression. Using a three-dimensional model system and other approaches to culture human mammary epithelial cells, we find that centrosome amplification triggers cell invasion. This invasive behaviour is similar to that induced by overexpression of the breast cancer oncogene ERBB2 (ref. 4) and indeed enhances invasiveness triggered by ERBB2. Our data indicate that, through increased centrosomal microtubule nucleation, centrosome amplification increases Rac1 activity, which disrupts normal cell-cell adhesion and promotes invasion. These findings demonstrate that centrosome amplification, a structural alteration of the cytoskeleton, can promote features of malignant transformation.


Assuntos
Neoplasias da Mama/patologia , Transformação Celular Neoplásica/patologia , Centrossomo/patologia , Genes erbB-2 , Aneuploidia , Mama/citologia , Mama/patologia , Neoplasias da Mama/genética , Adesão Celular , Linhagem Celular , Transformação Celular Neoplásica/genética , Progressão da Doença , Ativação Enzimática , Células Epiteliais/citologia , Células Epiteliais/patologia , Humanos , Microtúbulos/química , Microtúbulos/metabolismo , Microtúbulos/patologia , Invasividade Neoplásica/patologia , Receptor ErbB-2/genética , Receptor ErbB-2/metabolismo , Proteínas rac1 de Ligação ao GTP/metabolismo
7.
J Surg Oncol ; 120(3): 382-388, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31206726

RESUMO

BACKGROUND AND OBJECTIVES: Well-differentiated liposarcomas (WDL) are often partly composed of sclerotic tissue, however, the amount varies widely between tumors, and its prognostic significance is unknown. We hypothesized that tumors with more sclerosis would behave more aggressively. METHODS: Primary retroperitoneal WDL from 29 patients resected at our institution with follow-up were histologically evaluated by soft tissue pathologists blinded to outcome. Tumors with ≥ 10% sclerosis were designated "sclerotic" while tumors with < 10% sclerosis were designated as "minimally sclerotic". Cellular and dedifferentiated tumors were excluded. Clinical parameters and radiologic assessments on computed tomography (CT) were recorded. RESULTS: Histological evaluation identified 13 minimally sclerotic WDL and 16 sclerotic WDL. Median follow-up was 9 years (range, 3-20). Median recurrence-free survival (RFS) and median overall survival (OS) were 6.16 and 13.9 years, respectively. Compared with patients with sclerotic WDL, those with minimally sclerotic WDL had superior RFS (HR = 0.17 [95% CI, 0.06-0.53], P = .002) and OS (log-rank test, P = .002). Sclerotic WDL exhibited higher Houndsfield Units than minimally sclerotic WDL (26 vs 1, P = .040). CONCLUSIONS: Minimally sclerotic WDL were associated with more favorable outcome compared with sclerotic tumors. Assessment of sclerosis in WDL is likely a useful prognostic marker.


Assuntos
Lipossarcoma/patologia , Neoplasias Retroperitoneais/patologia , Esclerose/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Diferenciação Celular/fisiologia , Procedimentos Cirúrgicos de Citorredução , Intervalo Livre de Doença , Feminino , Humanos , Lipossarcoma/cirurgia , Masculino , Pessoa de Meia-Idade , Prognóstico , Neoplasias Retroperitoneais/cirurgia , Esclerose/cirurgia , Adulto Jovem
8.
Oncologist ; 23(3): 360-366, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29212731

RESUMO

BACKGROUND: Desmoplastic small round cell tumor (DSRCT) is an aggressive, often fatal soft tissue sarcoma that lacks an optimal salvage regimen. We retrospectively reviewed data from 29 pretreated DSRCT patients who received pazopanib at MD Anderson Cancer Center after failure of standard chemotherapies. SUBJECTS, MATERIALS, AND METHODS: Medical records of patients treated from January 2012 to December 2016 were reviewed and regression analyses were performed. Median progression-free survival (PFS) and overall survival (OS) were estimated using the Kaplan-Meier method and differences in survival were assessed by a log-rank test. A landmark statistical analysis was used to assess OS at a predefined 12-week time point following pazopanib initiation. RESULTS: The mean age at pazopanib treatment was 27.5 years (range, 6.3-50.1 years). According to RECIST 1.1 criteria, 16 patients (55%) had stable disease, 1 patient (3%) had partial response, 1 patient (3%) had complete response, and 11 patients (38%) had progressive disease. Estimated median PFS was 5.63 months (95% confidence interval [CI]: 3.23-7.47). Median OS was 15.7 months (95% CI: 10.3-32.4). As of December 2016, 11 patients (38%) were still alive, with a median follow-up time of 16.8 (range 3.8-30.1) months. Doses between 400 and 800 mg were included. Pazopanib was well tolerated and 23 (79%) of the patients continued it until progression or death, 4 discontinued because of side effects, and 2 were still on pazopanib at the time of data analysis. CONCLUSION: In the largest study conducted to date in DSRCT, pazopanib was well tolerated and clinically active in heavily pretreated patients who otherwise lack good treatment options. IMPLICATIONS FOR PRACTICE: Desmoplastic small round cell tumor (DSRCT) is a rare, extremely aggressive soft tissue sarcoma subtype that most commonly occurs in adolescent and young adult males. No DSRCT-specific therapies exist, and for lack of a better treatment approach, current therapies have relied upon U.S. Food and Drug Administration-approved drugs like pazopanib that exhibit clinical activity in other sarcoma subtypes. This article describes the largest experience to date using pazopanib as salvage treatment in heavily pretreated DSRCT patients. Pazopanib was well tolerated and clinically active, surpassing predefined metrics proposed by the European Organization for Research and Treatment of Cancer indicative of "active" sarcoma drugs (5.63 months progression-free survival [PSF], with 62% of the study population achieving progression-free survival at 12 weeks).


Assuntos
Antineoplásicos/uso terapêutico , Tumor Desmoplásico de Pequenas Células Redondas/tratamento farmacológico , Pirimidinas/uso terapêutico , Sulfonamidas/uso terapêutico , Adolescente , Adulto , Antineoplásicos/efeitos adversos , Criança , Tumor Desmoplásico de Pequenas Células Redondas/patologia , Feminino , Humanos , Indazóis , Masculino , Pessoa de Meia-Idade , Pirimidinas/efeitos adversos , Estudos Retrospectivos , Terapia de Salvação , Sulfonamidas/efeitos adversos , Análise de Sobrevida , Resultado do Tratamento , Adulto Jovem
9.
Histopathology ; 72(2): 239-247, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28796347

RESUMO

AIMS: Multiple genetic alterations, including alternative lengthening of telomeres (ALT) and NOTCH mutations, have been described in angiosarcoma. Loss of α-thalassaemia/mental retardation syndrome X-linked (ATRX) and death domain-associated protein 6 (DAXX) expression is frequently associated with the ALT phenotype. Additionally, inhibition of NOTCH signalling induces the development of malignant vascular tumours in mice, indicating a tumour suppressive role of the NOTCH pathway in the pathogenesis of angiosarcoma. The aim of this study was to evaluate the immunohistochemical expression of ATRX, DAXX and NOTCH receptors (NOTCH1 and NOTCH2) in a large cohort of angiosarcomas, and study their clinicopathological and prognostic significance. METHODS AND RESULTS: One hundred and forty cases of angiosarcoma were stained for ATRX, DAXX, NOTCH1 and NOTCH2. ATRX loss (<10% labelling) was seen in seven of 118 (6%) cases, and was more frequent in deep soft tissue tumours than in other body sites (P = 0.004). Angiosarcomas with ATRX loss were associated with worse event-free survival than angiosarcomas with retained ATRX expression (P = 0.003). DAXX was retained in all specimens examined. Decreased NOTCH1 expression (≤1+ intensity) was seen in 29 of 123 (24%) cases, and was associated with a cutaneous site of origin (P = 0.013) and advanced disease (P = 0.026). NOTCH2 expression was decreased in 16 of 103 (16%) cases, was associated with visceral tumours (P = 0.001), and correlated with worse disease-specific survival (P = 0.033). CONCLUSIONS: ATRX, NOTCH1 and NOTCH2 expression varies in angiosarcomas and shows significant correlations with site of origin and poor clinical outcome, thus highlighting the biological heterogeneity within this tumour type.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/biossíntese , Biomarcadores Tumorais/análise , Hemangiossarcoma/patologia , Proteínas Nucleares/biossíntese , Receptores Notch/biossíntese , Proteína Nuclear Ligada ao X/biossíntese , Proteínas Adaptadoras de Transdução de Sinal/análise , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Proteínas Correpressoras , Intervalo Livre de Doença , Feminino , Hemangiossarcoma/mortalidade , Humanos , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Chaperonas Moleculares , Proteínas Nucleares/análise , Prognóstico , Receptores Notch/análise , Proteína Nuclear Ligada ao X/análise , Adulto Jovem
10.
Nature ; 482(7385): 410-3, 2012 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-22318515

RESUMO

Tumorigenesis is a clonal evolution process that is initiated from single cells within otherwise histologically normal tissue. It is unclear how single, sporadic mutant cells that have sustained oncogenic alterations evolve within a tightly regulated tissue environment. Here we investigated the effects of inducing oncogene expression in single cells in organotypic mammary acini as a model to elucidate the processes by which oncogenic alterations initiate clonal progression from organized epithelial environments. Sporadic cells induced to overexpress oncogenes that specifically perturb cell-cycle checkpoints (for example, E7 from human papilloma virus 16, and cyclin D1), deregulate Myc transcription or activate AKT signalling remained quiescent within growth-arrested acini. By contrast, single cells that overexpress ERBB2 initiated a cellular cascade involving cell translocation from the epithelial layer, as well as luminal outgrowth that is characteristic of neoplastic progression in early-stage epithelial tumours. In addition, ERBB2-mediated cell translocation to the lumen was found to depend on extracellular-regulated kinase and matrix metalloproteinase activities, and genetic alterations that perturb local cell-matrix adhesion drove cell translocation. We also provide evidence that luminal cell translocation may drive clonal selection by promoting either the death or the expansion of quiescent oncogene-expressing cells, depending on whether the pre-existing alterations allow anchorage-independent survival and growth. Our data show that the initial outgrowth of single oncogene-expressing cells from organized epithelial structures is a highly regulated process, and we propose that a cell translocation mechanism allows sporadic mutant cells to evade suppressive micro-environments and elicits clonal selection for survival and proliferative expansion outside the native niches of these cells.


Assuntos
Transformação Celular Neoplásica/genética , Microambiente Celular/fisiologia , Evolução Clonal , Células Epiteliais/metabolismo , Células Epiteliais/patologia , Regulação Neoplásica da Expressão Gênica , Oncogenes/genética , Células Acinares/citologia , Células Acinares/metabolismo , Células Acinares/patologia , Adesão Celular , Técnicas de Cultura de Células , Linhagem Celular , Movimento Celular , Proliferação de Células , Transformação Celular Neoplásica/patologia , Células Cultivadas , Inibição de Contato , Células Epiteliais/citologia , Receptor ErbB-2/genética , Receptor ErbB-2/metabolismo , Microambiente Tumoral
11.
Histopathology ; 70(6): 946-953, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-27992966

RESUMO

AIMS: STAT3 is a pro-oncogenic transcription factor that requires phosphorylation for transcriptional activation. The aim of this study was to evaluate the role of phosphorylated STAT3 (pSTAT3) expression in neurofibromas, schwannomas, and malignant peripheral nerve sheath tumours (MPNSTs). METHODS AND RESULTS: Twenty-six neurofibromas, 62 schwannomas and 39 MPNSTs from a formalin-fixed paraffin-embedded tissue microarray were examined. Immunohistochemical analysis was performed with an anti-pSTAT3 (Tyr705) antibody. Nuclear expression was reviewed for both intensity and percentage of tumoral labelling. Distributions of disease-specific overall survival (DSOS) and event-free survival (EFS) were estimated with the Kaplan-Meier method, and compared between two pSTAT3 groups by use of the log-rank test. MPNSTs had higher median tumoral labelling than neurofibromas (P = 0.0012) or schwannomas (P = 0.0008). Moderate to strong pSTAT3 expression (defined as at least moderate labelling in ≥50% of cells) was found more frequently in MPNSTs than in neurofibromas (P = 0.026). Among MPNSTs, pSTAT3 expression differed between primary, recurrent and metastatic disease (P = 0.063 with increased expression in recurrent and metastatic cases). pSTAT3 expression (at least moderate labelling in ≥10% of cells) in primary MPNSTs was associated with worse DSOS (P = 0.048) and trended towards being associated with worse EFS (P = 0.063). Paired specimens revealed no increase in pSTAT3 expression in the recurrences or metastases relative to the primary tumour, suggesting that pSTAT3 expression may be an early indicator of aggressive disease at disease onset. CONCLUSIONS: pSTAT3 is expressed in a higher proportion of MPNSTs than neurofibromas and schwannomas. Moderate to strong pSTAT3 expression in ≥10% of cells was found to be a negative prognostic factor for DSOS among primary MPNSTs, suggesting a role of pSTAT3 in the progression of these tumours.


Assuntos
Biomarcadores Tumorais/análise , Neoplasias de Bainha Neural/metabolismo , Neoplasias de Bainha Neural/patologia , Fator de Transcrição STAT3/metabolismo , Adulto , Idoso , Criança , Progressão da Doença , Intervalo Livre de Doença , Feminino , Humanos , Imuno-Histoquímica , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Neurilemoma/metabolismo , Neurilemoma/patologia , Neurofibroma/metabolismo , Neurofibroma/patologia , Fosforilação , Prognóstico , Análise Serial de Tecidos
12.
Proc Natl Acad Sci U S A ; 110(41): 16309-14, 2013 Oct 08.
Artigo em Inglês | MEDLINE | ID: mdl-24065818

RESUMO

The crystallization of molecules with polar and hydrophobic groups, such as ionic amphiphiles and proteins, is of paramount importance in biology and biotechnology. By coassembling dilysine (+2) and carboxylate (-1) amphiphiles of various tail lengths into bilayer membranes at different pH values, we show that the 2D crystallization process in amphiphile membranes can be controlled by modifying the competition of long-range and short-range interactions among the polar and the hydrophobic groups. The pH and the hydrophobic tail length modify the intermolecular packing and the symmetry of their crystalline phase. For hydrophobic tail lengths of 14 carbons (C14), we observe the coassembly into crystalline bilayers with hexagonal molecular ordering via in situ small- and wide-angle X-ray scattering. As the tail length increases, the hexagonal lattice spacing decreases due to an increase in van der Waals interactions, as demonstrated by atomistic molecular dynamics simulations. For C16 and C18 we observe a reentrant crystalline phase transition sequence, hexagonal-rectangular-C-rectangular-P-rectangular-C-hexagonal, as the solution pH is increased from 3 to 10.5. The stability of the rectangular phases, which maximize tail packing, increases with increasing tail length. As a result, for very long tails (C22), the possibility of observing packing symmetries other than rectangular-C phases diminishes. Our work demonstrates that it is possible to systematically exchange chemical and mechanical energy by changing the solution pH value within a range of physiological conditions at room temperature in bilayers of molecules with ionizable groups.


Assuntos
Engenharia Celular/métodos , Cristalização/métodos , Membranas/química , Tensoativos/química , Carbono/química , Difusão , Concentração de Íons de Hidrogênio , Interações Hidrofóbicas e Hidrofílicas , Membranas/metabolismo , Estrutura Molecular , Espalhamento de Radiação , Temperatura
13.
J Am Chem Soc ; 136(41): 14377-80, 2014 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-25255327

RESUMO

Charged nanoscale filaments are well-known in natural systems such as filamentous viruses and the cellular cytoskeleton. The unique properties of these structures have inspired the design of self-assembled nanofibers for applications in regenerative medicine, drug delivery, and catalysis, among others. We report here on an amphiphile of completely different chemistry based on azobenzene and a quaternary ammonium bromide headgroup that self-assembles into highly charged nanofibers in water and orders into two-dimensional crystals. Interestingly small-angle X-ray scattering (SAXS) shows that these fibers of 5.6 nm cross-sectional diameter order into crystalline arrays with remarkably large interfiber spacings of up to 130 nm. Solution concentration and temperature can be adjusted to control the interfiber spacings, and addition of salt destroyed the crystal packing indicating the electrostatic repulsions are necessary for the observed ordering. Our findings here demonstrate the universal nature of this phenomenon in systems of highly charged nanoscale filaments.


Assuntos
Nanofibras/química , Estrutura Molecular , Espalhamento a Baixo Ângulo
14.
CNS Oncol ; 13(1): 2352414, 2024 Jun 06.
Artigo em Inglês | MEDLINE | ID: mdl-38869443

RESUMO

Aim: To evaluate the neuro-oncology providers' experience with patient online access to electronic records. Methods: Cross-sectional survey for physicians and advanced care providers within the field of neuro-oncology in the USA. Results: 65 providers completed the survey, from all major regions of the USA. 58% reported that at least once per month, patients contacted them outside of an office visit about provider notes or a laboratory or imaging finding accessed online. 54% of providers did not think that all laboratory results should be released automatically, and only 25% of providers thought that all radiology reads should be released immediately. 97% thought that some patients suffered substantial distress viewing test results prior to appointments. Qualitative responses aligned with the quantitative results. Conclusion: Most neuro-oncology providers are concerned about the immediate release of laboratory and imaging findings to patients without guidance.


Prior studies had investigated the perspectives of medical providers on patients having immediate access to medical records. However, almost none of them focus on neuro-oncology. In our study, we distributed a survey electronically to neuro-oncology providers across the USA to seek their perspectives. Our results show that most neuro-oncology providers found patients having immediate access to their records to be useful. However, they raised concerns about the immediate release of laboratory and imaging findings to patients without guidance. Our study also included free responses from the neuro-oncology providers that could help mitigate this concern.


Assuntos
Registros Eletrônicos de Saúde , Humanos , Estudos Transversais , Masculino , Feminino , Oncologia , Acesso dos Pacientes aos Registros , Atitude do Pessoal de Saúde , Estados Unidos , Inquéritos e Questionários , Neurologia
15.
Leuk Lymphoma ; 65(1): 62-68, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37878765

RESUMO

Computed tomography scans were assessed for subcutaneous fat area and density at thoracic vertebra 4 in 65 adolescent and young adult (AYA) patients with Hodgkin lymphoma. Subcutaneous fat was quantified over 3 timepoints; (1) baseline, (2) end of initial anthracycline treatment (EOT) and (3) 1 year. Fat area increased at EOT (62.3 ± 5.4 cm/m2 vs 53.5 ± 5.0 cm/m2, p < 0.01) and 1 year (65.8 ± 5.6 cm/m2 vs 53.5 ± 5.0 cm/m2, p < 0.01) compared to baseline. Fat density significantly decreased at EOT (-91.2 ± 1.4 HU vs -86.5 ± 1.4 HU, p < 0.01) and at 1 year (-90.3 ± 1.6 HU vs -86.5 ± 1.4 HU, p = 0.01) compared to baseline. Female, radiation receiving, and anthracycline dosage >250mg/m2subgroups experienced significant fat gain (p < 0.05 for all). Female AYA Hodgkin lymphoma patients receiving radiation, and/or high-dose anthracyclines may be at higher risk of subcutaneous fat gain during therapy.


Assuntos
Doença de Hodgkin , Adulto Jovem , Humanos , Feminino , Adolescente , Doença de Hodgkin/diagnóstico , Doença de Hodgkin/tratamento farmacológico , Doença de Hodgkin/patologia , Antraciclinas/efeitos adversos , Tomografia Computadorizada por Raios X
16.
Cureus ; 16(6): e61845, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38978918

RESUMO

This case report presents a rare occurrence of a single lung abscess caused by Panton-Valentine leukocidin (PVL)-producing methicillin-resistant Staphylococcus aureus (MRSA) in a 38-year-old immunocompetent man. The patient, of Southeast Asian origin, presented with symptoms of fever, chest pain, cough, and shortness of breath following a recent flu-like illness. Imaging indicated a cavitary lung lesion in the left lower lobe, suggestive of a lung abscess. Initial antibiotic treatment failed, and drainage of the abscess confirmed MRSA with the PVL gene, indicating a community-acquired MRSA infection. The patient received intravenous vancomycin followed by oral linezolid, leading to the resolution of the abscess. Contact tracing and decolonization measures were implemented. This case highlights the importance of considering PVL-producing S. aureus as a potential pathogen in severe necrotizing pneumonia or sepsis and underscores the need for prompt diagnosis, appropriate antibiotic therapy, and infection control measures in managing such infections.

17.
Respirol Case Rep ; 12(6): e01414, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38903947

RESUMO

Kikuchi-Fujimoto Disease (KFD), also known as Kikuchi disease or Kikuchi histiocytic necrotizing lymphadenitis, is a rare and self-limiting condition characterized by cervical lymphadenopathy and fever, primarily affecting young Asian adults. The aetiology of KFD remains unknown, although various infectious agents have been suggested as potential triggers. With the emergence of the COVID-19 pandemic, cases of post-COVID-19 KFD and post-COVID-19 vaccine KFD have been reported. In this article, we present the first case of post-COVID-19 KFD in Hong Kong. A 24-year-old man developed fever and painful neck swelling 1 month after recovering from COVID-19. Diagnostic evaluation, including ultrasound-guided fine needle aspiration cytology (FNAC), confirmed the diagnosis of KFD. The patient's symptoms resolved spontaneously with supportive care. This case underscores the importance of considering KFD as a potential differential diagnosis in patients presenting with cervical lymphadenopathy and fever following COVID-19 recovery or vaccination.

18.
Discov Oncol ; 15(1): 232, 2024 Jun 18.
Artigo em Inglês | MEDLINE | ID: mdl-38886296

RESUMO

Lung metastases are the primary cause of death for osteosarcoma (OS) patients. We recently validated interleukin-11 receptor α (IL-11Rα) as a molecular target for the inhibition of OS lung metastases. Since there is no clinically approved antibody against this receptor, we sought to identify downstream targets that mediate the effects of IL-11Rα signaling. We used shRNA to deplete IL-11Rα from OS cells; as a complementary approach, we added IL-11 exogenously to OS cells. The resulting changes in gene expression identified EZH2 as a downstream candidate. This was confirmed by knockdown of IL-11Rα in OS cells, which led to increased expression of genes repressed by histone methyltransferase EZH2, including members of the WNT pathway, a known target pathway of EZH2. Exogenous IL-11 increased the global levels of histone H3 lysine 27 trimethylation, evidence of EZH2 activation. Treatment with the EZH2 inhibitor GSK126 significantly reduced in vitro proliferation and increased cell-cycle arrest and apoptosis, which were partially mediated through the WNT pathway. In vivo, treatment of an orthotopic nude mouse model of OS with GSK126 inhibited lung metastatic growth and prolonged survival. In addition, significantly shorter recurrence-free survival was seen in OS patients with high levels of EZH2 in their primary tumors (P < .05). This suggests that IL-11Rα promotes OS lung metastasis via activation of EZH2. Thus, blocking EZH2 activity may be an effective strategy for inhibiting OS lung metastasis and improving prognosis.

19.
JCO Oncol Pract ; 20(6): 808-815, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38412400

RESUMO

PURPOSE: GI medical oncology care presents unique medication challenges. Here, we captured our clinical pharmacy specialists' (CPSs) involvement in patients with GI cancers starting cycle 1 of a new treatment. METHODS: Our quality initiative was performed in three stages (preintervention, intervention, and postintervention). Preintervention: retrospective baseline data collection from May to December 2019. Intervention: one-time telephone encounters were conducted by a CPS between March 15 and June 11, 2021. The primary objective of the quality improvement initiative was to increase patient interaction with a CPS to 80%. Postintervention: data collection to review the impact of CPS telephone encounters. RESULTS: Preintervention: we reviewed the electronic health records of 262 patients. Sixty nine percent of patients reported at least one adverse event (AE; range 1-6 AEs) at the first physician follow-up after treatment start. Most reported AEs (78%) were considered modifiable within the scope of CPS practice. Postintervention: during the intervention, 92% of patients (n = 389) received a telehealth encounter with the CPS. At the encounter, 315 patients (81%) reported at least one AE. CPS provided recommendations and/or additional education for 88% of reported AEs. Medication lists required correction 75% of the time. The median time for CPS encounters (including documentation) was 40 minutes. CONCLUSION: During a 3-month period, this quality improvement initiative successfully provided an early CPS-based telehealth intervention to identify and make initial recommendations for management of AEs for patients on cycle 1 of systemic therapy for GI cancer.


Assuntos
Oncologia , Farmacêuticos , Telefone , Humanos , Masculino , Feminino , Oncologia/métodos , Pessoa de Meia-Idade , Neoplasias Gastrointestinais/tratamento farmacológico , Neoplasias Gastrointestinais/terapia , Estudos Retrospectivos , Idoso , Adulto , Seguimentos , Melhoria de Qualidade
20.
EClinicalMedicine ; 69: 102482, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38374967

RESUMO

Background: Diabetic kidney disease (DKD) is a leading cause of end-stage kidney disease and is associated with high mortality rates. The influence of routine clinical parameters on DKD onset in patients with type 2 diabetes mellitus (T2DM) remains uncertain. Methods: In this systematic review and meta-analysis, we searched multiple databases, including PubMed, Embase, Scopus, Web of Science, and Cochrane Library, for studies published from each database inception until January 11, 2024. We included cohort studies examining the association between DKD onset and various clinical parameters, including body mass index (BMI), hemoglobin A1c (HbA1c), systolic blood pressure (SBP), diastolic blood pressure (DBP), total cholesterol (TC), triglycerides (TG), low-density lipoprotein (LDL), high-density lipoprotein (HDL), and serum uric acid (UA). Random-effect dose-response meta-analyses utilizing one-stage and/or cubic spline models, were used to estimate correlation strength. This study is registered in PROSPERO (CRD42022326148). Findings: This analysis of 46 studies involving 317,502 patients found that in patients with T2DM, the risk of DKD onset increased by 3% per 1 kg/m2 increase in BMI (relative risk (RR) = 1.03, confidence interval (CI) [1.01-1.04], I2 = 70.07%; GRADE, moderate); a 12% increased risk of DKD onset for every 1% increase in HbA1c (RR = 1.12, CI [1.07-1.17], I2 = 94.94%; GRADE, moderate); a 6% increased risk of DKD onset for every 5 mmHg increase in SBP (RR = 1.06. CI [1.03-1.09], I2 = 85.41%; GRADE, moderate); a 2% increased risk of DKD onset per 10 mg/dL increase in TG (RR = 1.02, CI [1.01-1.03], I2 = 78.45%; GRADE, low); an 6% decreased risk of DKD onset per 10 mg/dL increase in HDL (RR = 0.94, CI [0.92-0.96], I2 = 0.33%; GRADE, high), and a 11% increased risk for each 1 mg/dL increase in UA (RR = 1.11, CI [1.05-1.17], I2 = 79.46%; GRADE, moderate). Subgroup analysis revealed a likely higher risk association of clinical parameters (BMI, HbA1c, LDL, and UA) in patients with T2DM for less than 10 years. Interpretation: BMI, HbA1c, SBP, TG, HDL and UA are potential predictors of DKD onset in patients with T2DM. Given high heterogeneity between included studies, our findings should be interpreted with caution, but they suggest monitoring of these clinical parameters to identify individuals who may be at risk of developing DKD. Funding: Shenzhen Science and Innovation Fund, the Hong Kong Research Grants Council, and the HKU Seed Funds, and Scientific and technological innovation project of China Academy of Chinese Medical Sciences.

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