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Detecting Early Pancreatic Cancer: Current Problems and Future Prospects
Hiroyuki Matsubayashi,Hirotoshi Ishiwatari,Keiko Sasaki,Katsuhiko Uesaka,Hiroyuki Ono 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.1
The number of patients with pancreatic cancer (PC) is currently increasing in both Korea and Japan. The 5-year survival rate of patients with PC 13.0%; however, resection with minimal invasion (tumor size: ≤10 mm) increases the 5-year survival rate to 80%. For this reason, early detection is essential, but most patients with early-stage PC are asymptomatic. Early detection of PC has been reported to require screening of high-risk individuals (HRIs), such as those with a family history of PC, inherited cancer syndromes, intraductal papillary mucinous neoplasm, or chronic pancreatitis. Studies on screening of these HRIs have confirmed a significantly better prognosis among patients with PC who were screened than for patients with PC who were not screened. However, to date in Japan, most patients with early-stage PC diagnosed in routine clinics were not diagnosed during annual health checks or by surveillance; rather, PC was detected in these patients by incidental findings during examinations for other diseases. We need to increase the precision of the PC screening and diagnostic processes by introducing new technologies, and we need to pay greater attention to incidental clinical findings.
Familial Pancreatic Cancer and Surveillance of High-Risk Individuals
Hiroyuki Matsubayashi,Kyoichi Takaori,Chigusa Morizane,Yoshimi Kiyozumi 거트앤리버 소화기연관학회협의회 2019 Gut and Liver Vol.13 No.5
Family history of pancreatic cancer (PC) is a risk factor for PC development, and the risk level correlates with the number of affected families. A case of PC with ≥1 PC cases in the first-degree relative is broadly defined as familial pancreatic cancer (FPC) and accounts for 5% to 10% of total PC cases. FPC possesses several epidemiological, genetic and clinicopathological aspects that are distinct from those of conventional PCs. In Western countries, FPC registries have been established since the 1990s, and high-risk individuals are screened to detect early PCs. For the pharmacotherapy of FPC, especially in cases with germline pathogenic BRCA mutations, regimens using platinum and poly (ADP-ribose) polymerase inhibitor have recently been studied for their effectiveness. To date, the concept of FPC has prevailed in Western countries, and it has begun to infiltrate into Eastern countries. As the genetic background and environmental conditions vary in association with ethnicity and living area, we need to establish our own FPC registries and accumulate data in Asian countries.
[Oral Session 6] PLASTICIZATION AND BIODEGRADATION OF CELLULOSE ACETATE
Y.Matsubayashi,M.Ishizaki,Y.Sugihara,T.Tsuno 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
The study of biodegradable low-molecular-weight aliphatic polyesters as a plasticizer for cellulose acetate(CA), with a degree of substitution(DS) of 2.5, was conducted. A series of biodegradable low-molecular-weight aliphatic polyesters (MW=670 to 2900) consisting of dicarboxylic acids and diols was synthesized in this research. The plasticized CA' s were prepared first by dry blending using a high-speed mixer, and then through melt compounding by a kneader. The molecular weight effect of low-molecular-weight aliphatic polyesters as a plasticizer was not evident on mechanical properties but on melt compounding, With regard to mechanical properties poly(ethylene succinate) was a particularly suitable plasticizer for CA although other aliphatic polyesters studied in this research were also miscible with CA. The biodegradation and GPC studies of plasticized CA' s indicated that the weight loss of low-molecular-weight aliphatic polyesters was much faster than that of CA.
Fabrication of Cu(In, Ga)Se2 thin film solar cell absorbers from electrodeposited bilayers
Yusuke Oda,Masakazu Matsubayashi,Takashi Minemoto,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
CuInSe2 (CIS) and Cu(In, Ga)Se2 (CIGS) films as solar cell absorbers have been fabricated from electrodeposited (ED) In–Se/CIS and CIS/CuGaSe2 (CGS) bilayers, respectively. Firstly, In–Se/CIS bilayers were intermixed by annealing at 600 ℃ for 10 min and it followed that CIS films with large grains and controlled compositional ratios were realized. CIS solar cells using these films showed around 2.2% efficiency. Next,CIS/CGS bilayers were annealed at 600 ℃ for 60 min for intermixing. Here, oxygen-free CGS films prepared from Cu–Ga–Se solution added Li2SO4 as the supporting electrolyte were used because Ga–O compound formed in ED-CGS films worked as the defects. As the results, around 2.9% efficiency CIGS solar cell using the films was realized. Especially, 29.7 mA/㎠ and 36.1 mA/㎠ high short-circuit current density were obtained in the CIS and CIGS solar cells, respectively. These results indicate that ED-bilayers technique is useful to realize low-cost and high efficiency solar cell.
Analysis of Wide-gap Semiconductors with Superconducting XAFS Apparatus
Shiki, S.,Zen, N.,Matsubayashi, N.,Koike, M.,Ukibe, M.,Kitajima, Y.,Nagamachi, S.,Ohkubo, M. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.2
Fluorescent yield X-ray absorption fine structure (XAFS) spectroscopy is useful for analyzing local structure of specific elements in matrices. We developed an XAFS apparatus with a 100-pixel superconducting tunnel junction (STJ) detector array with a high sensitivity and a high resolution for light-element dopants in wide-gap semiconductors. An STJ detector has a pixel size of $100{\mu}m$ square, and an asymmetric layer structure of Nb(300 nm)-Al(70 nm)/AlOx/Al(70 nm)-Nb(50 nm). The 100-pixel STJ array has an effective area of $1mm^2$. The XAFS apparatus with the STJ array detector was installed in BL-11A of High Energy Accelerator Research Organization, Photon Factory (KEK PF). Fluorescent X-ray spectrum for boron nitride showed that the average energy resolution of the 100-pixels is 12 eV in full width half maximum for the N-K line, and The C-K and N-K lines are separated without peak tail overlap. We analyzed the N dopant atoms implanted into 4H-SiC substrates at a dose of 300 ppm in a 200 nm-thick surface layer. From a comparison between measured X-ray Absorption Near Edge Structure (XANES) spectra and ab initio FEFF calculations, it has been revealed that the N atoms substitute for the C site of the SiC lattice.