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Arafa AS, Yamada S, Imai M, Watanabe T, Yamayoshi S, Iwatsuki-Horimoto K, Kiso M, Sakai-Tagawa Y, Ito M, Imamura T, Nakajima N, Takahashi K, Zhao D, Oishi K, Yasuhara A, Macken CA, Zhong G, Hanson AP, Fan S, Ping J, Hatta M, Lopes TJS, Suzuki Y, El-Husseiny M, Selim A, Hagag N, Soliman M, Neumann G, Hasegawa H, Kawaoka Y. Risk assessment of recent Egyptian H5N1 influenza viruses. Sci Rep 2016; 6:38388. [PMID: 27922116 PMCID: PMC5138598 DOI: 10.1038/srep38388] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 11/08/2016] [Indexed: 11/26/2022] Open
Abstract
Highly pathogenic avian influenza (HPAI) viruses of the H5N1 subtype are enzootic in poultry populations in different parts of the world, and have caused numerous human infections in recent years, particularly in Egypt. However, no sustained human-to-human transmission of these viruses has yet been reported. We tested nine naturally occurring Egyptian H5N1 viruses (isolated in 2014-2015) in ferrets and found that three of them transmitted via respiratory droplets, causing a fatal infection in one of the exposed animals. All isolates were sensitive to neuraminidase inhibitors. However, these viruses were not transmitted via respiratory droplets in three additional transmission experiments in ferrets. Currently, we do not know if the efficiency of transmission is very low or if subtle differences in experimental parameters contributed to these inconsistent results. Nonetheless, our findings heighten concern regarding the pandemic potential of recent Egyptian H5N1 influenza viruses.
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Deguchi T, Sato F, Eda M, Izumi H, Suzuki H, Suryan RM, Lance EW, Hasegawa H, Ozaki K. Translocation and hand-rearing result in short-tailed albatrosses returning to breed in the Ogasawara Islands 80 years after extirpation. Anim Conserv 2016. [DOI: 10.1111/acv.12322] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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78
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Muraoka M, Takagi K, Morita Y, Nagano H, Henmi N, Hasegawa H. Is the neonatal creatine phosphokinase level a reliable marker for fetal hypoxia? J Obstet Gynaecol Res 2016; 43:114-121. [PMID: 27862683 DOI: 10.1111/jog.13176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 08/21/2016] [Indexed: 11/29/2022]
Abstract
AIM The creatine phosphokinase (CPK) level is believed to increase in neonatal peripheral blood after tissue damage, including damage from perinatal hypoxia. However, it is not clear whether it is truly a reliable marker for fetal hypoxia. We investigated the chronological changes in neonatal CPK and the reliability of CPK as a marker for fetal hypoxia. METHODS Sixty term neonates admitted to the neonatal intensive care unit at Tokyo Women's Medical University Medical Center East from April 2009 to April 2010 were enrolled in this study. We evaluated whether asphyxia and fetal heart rate (FHR) abnormality could predict the neonatal CPK level by using receiver-operator curve analysis. We also compared umbilical cord blood pH levels with neonatal CPK levels. In addition, we investigated factors that influence neonatal CPK in non-asphyxia cases. RESULTS The median value of CPK peaked on day 1. There were no significant differences in CPK levels regardless of the presence of asphyxia or FHR abnormality. Non-asphyxiated neonates with older gestational ages and amniotic fluid abnormalities had significantly higher levels of CPK. CONCLUSION Our results indicate that the neonatal CPK level is not an appropriate marker for retrospectively predicting either asphyxia or FHR abnormality. There are influencing factors other than asphyxia that increase neonatal CPK. Therefore, one should be careful when making a diagnosis of perinatal hypoxia based solely on increased levels of neonatal CPK after birth.
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Noda M, Sato T, Hayakawa K, Tomita N, Kamikonnya N, Matoba S, Uki A, Baba H, Oya N, Hasegawa H, Shigematu N, Hida K, Furuhata T, Naitou T, Shimada M, Otuka K, Higuchi Y, Sakai Y, Takeuchi M, Watanabe M. A multicenter phase II study of preoperative concurrent chemoradiotherapy with S-1 plus irinotecan for locally advanced rectal cancer: SAMRAI-2. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw370.25] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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80
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Nishina T, Kuboki Y, Shinozaki E, Fukuoka S, Kajiwara T, Shitara K, Yamaguchi K, Komatsu Y, Yuki S, Yamazaki K, Hara H, Mochizuki N, Fukutani M, Hasegawa H, Matsuda S, Wakabayashi M, Nomura S, Sato A, Ohtsu A, Yoshino T. A multicentre phase I/II study of TAS-102 with nintedanib in patients with metastatic colorectal cancer refractory to standard therapies (N-TASK FORCE: EPOC1410); Phase I results. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw370.21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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81
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Yamagishi T, Hasegawa H, Kanai H. [PP.05.19] EFFECTS OF SGLT2 INHIBITORS ON BLOOD PRESSURE, BAPWV, CAROTID ARTERIAL IMT AND ELASTIC MODULUS IN TYPE 2 DIABETIC PATIENTS WITH OBESITY. J Hypertens 2016. [DOI: 10.1097/01.hjh.0000491731.92423.b9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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82
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Suzuki R, Watanabe H, Hasegawa H, Tsukamoto K, Kobayashi M, Kyoya T, Saito S, Kobayashi J. Time-lapse observation can help improve workflow and ensure the correct observation of fertilized embryos. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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83
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Tomida E, Kato Y, Ozawa H, Hasegawa H, Ishii N, Hashimoto T, Akiyama M. Causative drug detection by drug-induced lymphocyte stimulation test in drug-induced linear IgA bullous dermatosis. Br J Dermatol 2016; 175:1106-1108. [PMID: 26265104 DOI: 10.1111/bjd.14069] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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84
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Yoshino T, Kuboki Y, Nishina T, Shinozaki E, Yamazaki K, Shitara K, Okamoto W, Kajiwara T, Matsumoto T, Tsushima T, Mochizuki N, Fukutani M, Nakamoto M, Hasegawa H, Sugama A, Nomura S, Sato A, Ohtsu A. PD-013 Final survival results of a multicenter phase I/II study of TAS-102 with bevacizumab for metastatic colorectal cancer patients refractory to standard therapies (C-TASK FORCE). Ann Oncol 2016. [DOI: 10.1093/annonc/mdw200.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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85
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Fukui S, Nakamura H, Takahashi Y, Hasegawa H, Yanagihara K, Nakamura T, Kawakami A. SAT0486 TNF Inhibitors Have No Effects To Human T-Lymphotropic Virus Type-I (HTLV-I)-Infected Cell Line. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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86
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Kawashima S, Segawa O, Kimura S, Tsuchiya M, Henmi N, Hasegawa H, Fujibayashi M, Naritaka Y. A case of cervical esophageal duplication cyst in a newborn infant. Surg Case Rep 2016; 2:30. [PMID: 27037803 PMCID: PMC4818649 DOI: 10.1186/s40792-016-0157-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/28/2016] [Indexed: 12/11/2022] Open
Abstract
Esophageal duplication cyst is a rare congenital anomaly resulting from a foregut budding error during the fourth to sixth week of embryonic development. Cervical esophageal duplication cysts are very rare and may cause respiratory distress in infancy. A full-term newborn girl who was born by normal delivery was transferred to our hospital because of swelling of the right anterior neck since birth. Cervical ultrasonography showed a 40 × 24 × 33 mm simple cyst on the right neck. Tracheal intubation was required at 2 weeks of age because of worsening external compression of the trachea. Fine-needle aspiration cytology revealed the existence of ciliated epithelium. At 1 month of age, exploration was performed through a transverse neck incision. The cyst had a layer of muscle connected to the lateral wall of the esophagus. Histopathological diagnosis was a cervical esophageal duplication cyst. We describe the clinical features of infantile cervical esophageal duplication cysts based on our experience of this rare disease in a neonate, along with a review of 19 cases previously reported in literature.
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Yamada T, Okabayashi K, Hasegawa H, Tsuruta M, Yoo JH, Seishima R, Kitagawa Y. Meta-analysis of the risk of small bowel obstruction following open or laparoscopic colorectal surgery. Br J Surg 2016; 103:493-503. [DOI: 10.1002/bjs.10105] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 12/13/2015] [Accepted: 12/14/2015] [Indexed: 12/17/2022]
Abstract
Abstract
Background
One of the potential advantages of laparoscopic compared with open colorectal surgery is a reduction in postoperative bowel obstruction events. Early reports support this proposal, but accumulated evidence is lacking.
Methods
A systematic review and meta-analysis was performed of randomized clinical trials and observational studies by searching the PubMed and Cochrane Library databases from 1990 to August 2015. The primary outcomes were early and late postoperative bowel obstruction following laparoscopic and open colorectal surgery. Both ileus and bowel obstruction were defined as a postoperative bowel obstruction. Subgroup and sensitivity analyses were performed, and a random-effects model was used to account for the heterogeneity among the studies.
Results
Twenty-four randomized clinical trials and 88 observational studies were included in the meta-analysis; 106 studies reported early outcome and 12 late outcome. Collectively, these studies reported on the outcomes of 148 392 patients, of whom 58 133 had laparoscopic surgery and 90 259 open surgery. Compared with open surgery, laparoscopic surgery was associated with reduced rates of early (odds ratio 0·62, 95 per cent c.i. 0·54 to 0·72; P < 0·001) and late (odds ratio 0·61, 0·41 to 0·92; P = 0·019) postoperative bowel obstruction. Weighted mean values for early postoperative bowel obstruction were 8 (95 per cent c.i. 6 to 10) and 5 (3 to 7) per cent for open and laparoscopic surgery respectively, and for late bowel obstruction were 4 (2 to 6) and 3 (1 to 5) per cent respectively.
Conclusion
The reduction in postoperative bowel obstruction demonstrates an advantage of laparoscopic surgery in patients with colorectal disease.
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88
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Tominaga C, Hasegawa H, Yamashita K, Arakawa R, Kawasaki H. UV photo-mediated size-focusing synthesis of silver nanoclusters. RSC Adv 2016. [DOI: 10.1039/c6ra10892j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
In this work, we first report the photo-mediated size-focusing synthesis of glutathione (SG)-protected atomically precise Ag nanoclusters (Ag NCs).
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Komori A, Taniguchi H, Kito Y, Hamauchi S, Masuishi T, Hasegawa H, Mitani S, Narita Y, Kadowaki S, Ura T, Ando M, Mori K, Yasui H, Muro K, Yamazaki K. 169P Serum CA19-9 response is an early predictive marker for the efficacy of regorafenib in refractory metastatic colorectal cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv523.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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90
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Kawabata R, Sakai D, Kawada J, Nishikawa K, Kawase T, Oka Y, Sugimoto N, Shimizu T, Nishijima J, Hasegawa H, Endo S, Isozaki Y, Kimura Y, Matsuyama J, Kurokawa Y, Shimokawa T, Fujitani K, Sato T. 203P A phase II trial of trastuzumab combined with irinotecan in patients with advanced HER2-positive chemo-refractory gastric cancer: Osaka Gastrointestinal Cancer Chemotherapy Study Group OGSG1203 (HERBIS-5). Ann Oncol 2015. [DOI: 10.1093/annonc/mdv523.64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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91
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Yoshida Y, Yamazaki K, Mizusawa J, Satoh M, Hinoi T, Tsuchida A, Otsuka K, Sato T, Watanabe M, Baba H, Kimura H, Idani H, Kanazawa A, Fukunaga M, Okuda J, Tajima Y, Hasegawa H, Katayama H, Hamaguchi T, Shimada Y. 2129 Predictive factor for toxicities and treatment termination in adjuvant capecitabine therapy for stage III colorectal cancer; based on the data of a randomized trial, JCOG0910. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31051-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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92
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Nishikawa K, Yoshino S, Morita S, Takahashi T, Sakata K, Nagao J, Nemoto H, Murakami N, Matsuda T, Hasegawa H, Shimizu R, Yoshikawa T, Osanai H, Imano M, Naitoh H, Yabe M, Tanaka A, Sakamoto J, Saji S, Oka M. 2329 A randomized phase III study of S-1 alone versus S-1 plus immunomodulator lentinan for unresectable or recurrent gastric cancer (JFMC36–0701). Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31245-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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93
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94
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Shimokaze T, Sasaki A, Meguro T, Hasegawa H, Hiraku Y, Yoshikawa T, Kishikawa Y, Hayasaka K. Genotype-phenotype relationship in Japanese patients with congenital central hypoventilation syndrome. J Hum Genet 2015; 60:473-7. [PMID: 26063465 DOI: 10.1038/jhg.2015.65] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 05/07/2015] [Accepted: 05/12/2015] [Indexed: 11/09/2022]
Abstract
Examine the genotype-phenotype relationship in Japanese congenital central hypoventilation syndrome (CCHS) patients and estimate the incidence of CCHS in Japan. Subjects were 92 Japanese patients with PHOX2B mutations; 19 cases carried 25 polyalanine repeat expansion mutations (PARMs); 67 cases carried 26 or more PARMs; and 6 had non-PARMs (NPARMs). We collected clinical data in all patients and estimated the development or intelligent quotients only in the patients carrying 25 PARM. The estimated incidence of CCHS was greater than one case per 148 000 births. Polyhydramnios was observed in three cases. Twelve infants exhibited depressed respiration at birth. In 19 cases carrying 25 PARM, the male-to-female ratio was ~3, no cases had Hirschsprung disease; 7 cases (37%) developed hypoventilation after the neonatal period, and 8 cases (42%) had mental retardation. In other 73 cases carrying 26 or more PARMs or NPARMs, male-to-female ratio was equal; patients frequently complicated with Hirschsprung disease and constipation, and all patients presented with hypoventilation in the neonatal period. Clinical symptoms were severe in most patients carrying long PARMs and NPARMs. In 25 PARM, additional genetic and/or epigenetic factors were required for CCHS development and male sex is likely a predisposing factor. The patients carrying 25 PARM frequently had mental retardation likely because they were not able to receive appropriate ventilation support following a definitive diagnosis owing to subtle and or irregular hypoventilation. Molecular diagnosis provides a definitive diagnosis and enables to receive appropriate ventilator support.
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Taniguchi H, Hasegawa H, Masuishi T, Narita Y, Komori A, Kadowaki S, Ura T, Muro K. P-232 Characterization of serum HER2 ECD level in patients with metastatic colorectal cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv233.229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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96
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Arita N, Ushio Y, Hayakawa T, Mori S, Bitoh S, Hasegawa H, Akagi K, Kano M, Oku Y, Go J. Role of tumor markers in the management of primary intracranial germ cell tumors. PROGRESS IN EXPERIMENTAL TUMOR RESEARCH 2015; 30:289-95. [PMID: 2442797 DOI: 10.1159/000413686] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Hasegawa H. Estimation of coagulation-fibrinolytic factors in DIC. BIBLIOTHECA HAEMATOLOGICA 2015:173-80. [PMID: 6667245 DOI: 10.1159/000408458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A computer analysis of the coagulation laboratory records at the first department of Hokkaido University Hospital over a three-year period (1979-1981) was performed on 553 patients with presumptive intravascular coagulation. It is indicated that the most important diagnostic tests for DIC were Fbg, FDP, and AT III. DIC may have developed not only in patients with reduced Fbg but also in patients with normal or elevated Fbg. It is necessary to estimate the actual situations in the patients with DIC by utilizing sequential laboratory tests. In DIC, SDS-PAGE patterns of Fbg indicated the marked reduction of LMW Fbg, and the activated fibrin formation must be caused by the high affinity of thrombin for HMW Fbg. Changes in the immunoprecipitative second peak of AT III may indicate the binding of different serine proteases to AT III in DIC. Rapid and simple diagnostic tests for DIC are clinically required. An analysis of the TEG pattern using normal plasma mixed with the patient's plasma can indicate the presence of procoagulant activity in patient plasma. Such a laboratory test using TEG is the most useful and rapid diagnostic test in DIC. An anticoagulant effect of heparin therapy is determined by APTT and heparin levels. The antithrombotic effect of heparin therapy is determined by FPA as an immediate index and by Fbg, FDP, and AT III as a slow index.
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Müller-Berghaus G, Hasegawa H. Pathogenesis of disseminated intravascular coagulation. BIBLIOTHECA HAEMATOLOGICA 2015:3-13. [PMID: 6667251 DOI: 10.1159/000408441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Figure 5 summarizes the three different phases in the pathophysiology of disseminated intravascular coagulation exemplified by the effect of endotoxin. During the first phase, the coagulation system is activated to generate soluble fibrin. Fibrin kept in solution by fibrinogen or fibrinolytic degradation products can be cleared from the circulating blood. If the amount of soluble fibrin exceeds a certain threshold, soluble fibrin may precipitate or polymerize to fibrin clots. At this state, active fibrinolysis breaks down the precipitated fibrin to fibrinolytic degradation products preventing the preservation of fibrin. If the capacity of the fibrinolytic system is exhausted, or if fibrinolysis is inhibited, fibrin clots may be preserved, causing cell damage, as for instance bilateral renal cortical necrosis.
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Kaneko T, Tada Y, Maruya S, Takeishi E, Miura K, Masubuchi T, Fushimi C, Hasegawa H, Kamata S. Intra-arterial chemoradiation therapy with weekly low-dose cisplatin for squamous cell carcinoma of the maxillary sinus. Int J Oral Maxillofac Surg 2015; 44:697-704. [PMID: 25843537 DOI: 10.1016/j.ijom.2015.03.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 10/28/2014] [Accepted: 03/06/2015] [Indexed: 02/03/2023]
Abstract
A new intra-arterial chemoradiation regimen that involves infusing low-dose cisplatin in combination with definitive irradiation was used in 36 patients diagnosed with squamous cell carcinoma of the maxillary sinus. The safety and therapeutic efficacy of this regimen were reviewed retrospectively. An intra-arterial catheter was inserted in a retrograde manner into the target artery via the superficial temporal artery or occipital artery. Intra-arterial infusion was performed using cisplatin at a dose of 20-50mg/m(2) per week for 6-8 weeks. At the same time, sodium thiosulphate was infused as a neutralizing agent. Irradiation was performed at 60Gy in 30 fractions. All 36 patients completed treatment. Grade 3 adverse events occurred in only seven patients (19.4%) and no grade 4 events were noted. As a primary therapy, the complete response rate was 83.3%, the partial response rate was 16.7%, and the overall response rate was 100%. The 2-year local control rate was 63.0%, and the 2-year overall survival rate was 75.5%. The 2-year preservation rate of the hard palate was 97.1%, that of the eyeball was 97.2%, and that of visual function was 94.4%. This treatment regimen can contribute to improving the quality of life of patients without reducing the curability of the therapy.
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Zhang Y, Li X, Chihara T, Mizoguchi T, Hori A, Udagawa N, Nakamura H, Hasegawa H, Taguchi A, Shinohara A, Kagami H. Comparing immunocompetent and immunodeficient mice as animal models for bone tissue engineering. Oral Dis 2015; 21:583-92. [PMID: 25648203 DOI: 10.1111/odi.12319] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/04/2015] [Accepted: 01/16/2015] [Indexed: 12/12/2022]
Abstract
OBJECTIVES To understand the differences and similarities between immunocompetent and immunodeficient mice as ectopic transplantation animal models for bone tissue engineering. MATERIALS AND METHODS Osteogenic cells from mouse leg bones were cultured, seeded on β-TCP granules, and transplanted onto the backs of either immunocompetent or immunodeficient nude mice. At 1, 2, 4, and 8 weeks postoperatively, samples were harvested and evaluated by hematoxylin-eosin staining, tartrate-resistant acid phosphatase (TRAP) staining, and immunohistochemical staining and quantitative PCR. RESULTS In immunocompetent mice, inflammatory cell infiltration was evident at 1 week postoperatively and relatively higher expression of TNF-α and IL-4 was observed. In immunodeficient mice, new bone area and the number of TRAP-positive cells were larger at 4 weeks than in immunocompetent mice. The volume of new bone area in immunodeficient mice was reduced by 8 weeks. CONCLUSIONS Bone regeneration was feasible in immunocompetent mice. However, some differences were observed between immunocompetent and immunodeficient mice in the bone regeneration process possibly due to different cytokine expression, which should be considered when utilizing in vivo animal models.
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