There has been reported that the association between nodal spread and tumor size was disrupted in triple-negative breast cancer (TNBC) and it showed characteristically early relapse. The TNM ...(tumor–node–metastasis) staging system might not be equally effective as a prognostic indicator for all subtypes. The aim of our study was to evaluate the usefulness of the staging according to subtypes.
We conducted a retrospective analysis of invasive breast cancer patients who received curative surgery at Samsung Medical Center from 2000 to 2004. Relapse-free survivals (RFS) by stage were analyzed.
Thousand eight hundred and seventy-nine patients who were available clinicopathologic data were included. These patients were divided into three subtypes: hormone receptor (HR)+, human epidermal growth factor receptor 2+, and triple negative groups. As the stage became more advanced, the slope of each stage of the RFS curves of patients with HR+ and HER2+ steadily increased. In contrast, RFS curves intermingled and showed overlap from stage 1 to 3A in TNBC patients. There was only wide separation of RFS curves between stage 1-3A and 3B-3C in TNBC.
The current TNM staging system might not be enough for encompassing the tumor biology and for predicting outcomes to make therapeutic decisions for all BCs, especially for TNBC patients.
SETTING The long-term natural course of Mycobacterium avium complex (MAC) disease with nodular bronchiectasis, the most common pulmonary non-tuberculous mycobacterial disease, is not well described.
...To identify risk factors for the deterioration of nodular bronchiectatic MAC lung disease over a 5-year follow-up period.
Clinical and laboratory data of 67 patients with nodular bronchiectatic MAC lung disease were collected. Chest computerised tomographic images were used to count the number of lung segments involved at diagnosis and measure subcutaneous fat thickness during follow-up.
The 34 patients who showed deterioration had significantly lower body mass index (BMI) (P = 0.004) and % predicted forced vital capacity (P = 0.032), higher numbers of lung segments involved (P < 0.001) and MAC-positive sputum cultures (P = 0.028), and thinner chest subcutaneous fat during follow-up (P < 0.001) than patients without deterioration. In particular, patients with both BMI <21.0 kg/m(2) and more than four lung segments involved had a 240-fold increased risk of deterioration (P < 0.001).
Patients with poor nutritional status and extensive lung involvement tend to experience deterioration of nodular bronchiectatic MAC lung disease.
Identifying the extent of environmental contamination of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is essential for infection control and prevention. The extent of environmental ...contamination has not been fully investigated in the context of severe coronavirus disease (COVID-19) patients.
To investigate environmental SARS-CoV-2 contamination in the isolation rooms of severe COVID-19 patients requiring mechanical ventilation or high-flow oxygen therapy.
Environmental swab samples and air samples were collected from the isolation rooms of three COVID-19 patients with severe pneumonia. Patients 1 and 2 received mechanical ventilation with a closed suction system, while patient 3 received high-flow oxygen therapy and non-invasive ventilation. Real-time reverse transcription–polymerase chain reaction (rRT–PCR) was used to detect SARS-CoV-2; viral cultures were performed for samples not negative on rRT–PCR.
Of the 48 swab samples collected in the rooms of patients 1 and 2, only samples from the outside surfaces of the endotracheal tubes tested positive for SARS-CoV-2 by rRT–PCR. However, in patient 3's room, 13 of the 28 environmental samples (fomites, fixed structures, and ventilation exit on the ceiling) showed positive results. Air samples were negative for SARS-CoV-2. Viable viruses were identified on the surface of the endotracheal tube of patient 1 and seven sites in patient 3's room.
Environmental contamination of SARS-CoV-2 may be a route of viral transmission. However, it might be minimized when patients receive mechanical ventilation with a closed suction system. These findings can provide evidence for guidelines for the safe use of personal protective equipment.
An ultrafast electrochromic display is fabricated based upon well defined nanotube arrays of poly(3,4‐ethylenedioxythiophene), PEDOT (see Figure). The thin nature of the nanotube walls (10 – 20 nm) ...offers a short ion‐diffusion distance, which results in an ultrafast switching rate (color‐switching time < 10 ms). The arrayed long nanotube structure furnishes strong coloration.
Aim To validate the usefulness of diffusion-weighted imaging (DWI) in the differentiation of high-flow haemangiomas showing pseudo-washout appearance on gadoxetic acid-enhanced hepatic MRI from small ...hypervascular hepatocellular carcinomas (HCCs). Materials and methods DWI (b=50, 800 s/mm2 ) with apparent diffusion coefficient (ADC) maps for 50 haemangiomas (6.4±2.9 mm) showing intense enhancement on arterial dominant phase imaging and hypointensity on transitional and/or hepatobiliary phase imaging during gadoxetic acid-enhanced MRI were retrospectively analysed and compared with that of 113 hypervascular HCCs (12.8±3.7 mm). In addition to measurement of mean ADC values on DWI and contrast-to-noise ratio (CNR) on corresponding T2-weighted imaging, qualitative analysis of DWI was performed for each lesion by two independent observers using a five-point scale. Results Both of mean ADC value (1.902 versus 0.997×10−3 mm2 /s) and mean CNR (119.2 versus 36.9) for haemangioma were significantly larger than for HCC ( p <0.001). On receiver operating characteristic (ROC) analysis, an area under the curve (AUC) of 0.995 for ADC values was significantly larger than 0.915 for CNRs ( p =0.002). When the ADC value of 1.327×10−3 mm2 /s was used as the threshold for the diagnosis of haemangioma, the sensitivity and specificity were 98% and 97.3%, respectively. The mean sensitivity and specificity of qualitative analysis for the differentiation of haemangioma from HCC were 92% and 99.1%, respectively. Conclusion For high-flow small haemangiomas showing pseudo-washout appearance during gadoxetic acid-enhanced hepatic MRI, high b-factor DWI including an ADC map may provide additional information to enhance the confidence to exclude small hypervascular HCCs.
The phosphorus (P) adsorption characteristic of sesame straw biochar prepared with different activation agents and pyrolysis temperatures was evaluated. Between 0.109 and 0.300 mg L⁻¹ in the form of ...inorganic phosphate was released from raw sesame straw biochar in the first 1 h. The release of phosphate was significantly enhanced from 62.6 to 168.2 mg g⁻¹ as the pyrolysis temperature increased. Therefore, sesame straw biochar cannot be used as an adsorbent for P removal without change in the physicochemical characteristics. To increase the P adsorption of biochar in aqueous solution, various activation agents and pyrolysis temperatures were applied. The amount of P adsorbed from aqueous solution by biochar activated using different activation agents appeared in the order ZnCl₂ (9.675 mg g⁻¹) > MgO (8.669 mg g⁻¹) ⋙ 0.1N-HCl > 0.1N-H₂SO₄ > K₂SO₄ ≥ KOH ≥ 0.1N-H₃PO₄, showing ZnCl₂ to be the optimum activation agent. Higher P was adsorbed by the biochar activated using ZnCl₂ under different pyrolysis temperatures in the order 600 °C > 500 °C > 400 °C > 300 °C. Finally, the amount of adsorbed P by activated biochar at different ratios of biochar to ZnCl₂ appeared in the order 1:3 ≒ 1:1 > 3:1. As a result, the optimum ratio of biochar to ZnCl₂ and pyrolysis temperature were found to be 1:1 and 600 °C for P adsorption, respectively. The maximum P adsorption capacity by activated biochar using ZnCl₂ (15,460 mg kg⁻¹) was higher than that of typical biochar, as determined by the Langmuir adsorption isotherm. Therefore, the ZnCl₂ activation of sesame straw biochar was suitable for the preparation of activated biochar for P adsorption.
The tsunamis that have occurred in many places around the world over the past decade have taken a heavy toll on human lives and property. The eastern coast of the Korean Peninsula is not safe from ...tsunamis, particularly the eastern coastal areas, which have long sustained tsunami damage. The eastern coast had been attacked by 1983 and 1993 tsunami events. The aim of this study was to mitigate the casualties and property damage against unexpected tsunami attacks along the eastern coast of the Korean Peninsula by developing a proper tsunami response system for important ports and harbors with high population densities and high concentrations of key national industries. The system is made based on numerical and physical modelings of 3 historical and 11 virtual tsunamis events, field surveys, and extensive interviews with related people.
We have used the Linac Coherent Light Source to generate solid-density aluminum plasmas at temperatures of up to 180 eV. By varying the photon energy of the x rays that both create and probe the ...plasma, and observing the K-α fluorescence, we can directly measure the position of the K edge of the highly charged ions within the system. The results are found to disagree with the predictions of the extensively used Stewart-Pyatt model, but are consistent with the earlier model of Ecker and Kröll, which predicts significantly greater depression of the ionization potential.
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