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  • 1
    Publication Date: 2020-07-21
    Description: On December 16, 1988, after 26 years of dormancy since the last eruption in 1962, Tokachi-dake began to erupt from the 62-II crater. The eruption started with phreatic explosions. Then, on December 19, the activity changed into phreatomagmatic explosions of Vulcanian type and continued intermittently until March 5, 1989. Although the composition of the essential ejecta, mafic andesite, is similar to those of 1926 and 1962 eruptions, the mode of the present eruption is considerably diffrent The present eruption consists of a series of 23 discrete cannon-like explosions, being frequently accompanied with small-scale pyrcclastic surges and flows. The total volume of ejecta amounts to approximately 6×105 m3, of which about 20% is essential ejecta. A complete sequence of events was compiled and distribution maps of the ash-fall, ballistic blocks, and pyroclastic surges and flows were drawn for each of the larger eruptions. The pyrrolastic surges and flows of the present eruption were small scale, low temperature pyroclastic flows, rich in accessory clasts and unaccompanied by sector collapse. Therefore, the sudden melting of snow causing disastrous mudflows, as in the case of the 1926 eruption, fortunately did not occur.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    Publication Date: 2020-07-21
    Description: Twenty-three small-scale eruptions took place at Tokachi-dake from December 16, 1988 to March 5, 1989. The pyroclastic fall deposits, ballistic fragments, and pyroclastic surge and flow deposits were dispersed over the flank and leeward areas of the volcano. Because the pyroclasts of each eruption were well-preserved in snow during the winter, the stratigraphy and distribution of these deposits could be studied in detail. The volume of the pyroclastic fall deposits are nearly equal to those of the pyroclastic surge and flow deposits. The total volume of these pyroclasts is estimated to be 7.4×105 m3. Judging from the sequential changes of the volume and composition of the pyroclasts, the characteristic features of the eruption can be summarized as follows: At first, a vent was opened by ejection of altered rock fragments in December, 1988. Then, essential fragments were ejected in January, 1989. Finally the activity level of magma declined and the altered rock fragments content increased again in February to March, 1989.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2016-04-08
    Description: Irinotecan-based chemotherapy with bevacizumab is one of the first-line standard therapies for metastatic colorectal cancer (mCRC). TEGAFIRI (UFT/LV + irinotecan) is an irinotecan-based chemotherapy regimen. Currently, few clinical data regarding TEGAFIRI are available. This study evaluated the efficacy and safety of TEGAFIRI in Japanese patients with mCRC. This is a multicenter, randomized, phase II study. The major inclusion criteria were previously untreated patients with mCRC (age: 20–75 years, Eastern Cooperative Oncology Group performance status: 0–1). Eligible patients were randomly assigned (1:1) to receive either FOLFIRI ± bevacizumab or TEGAFIRI ± bevacizumab. The primary endpoint was progression-free survival (PFS). The secondary endpoints were response rate, overall survival, dose intensity, and toxicity. From November 2007 to October 2011, 36 and 35 patients assigned to the FOLFIRI and TEGAFIRI groups were included in the primary analysis. No significant difference in PFS was observed between the groups {median PFS: TEGAFIRI 9.9 months [95% confidence interval (CI), 6.5–14.7], FOLFIRI 10.6 months [95% CI, 7.7–16.5]; Hazard ratio, 0.98, 95% CI, 0.57–1.66, p = 0.930}. The response rates in the FOLFIRI and TEGAFIRI groups were 56% and 66%, respectively. Relative dose intensity was similar between the groups. The most common Grade 3/4 adverse event was diarrhea (26%) in TEGAFIRI group and neutropenia (39%) in the FOLFIRI group. The results of the present study indicate that TEGAFIRI ± bevacizumab is an effective and tolerable first-line treatment regimen for mCRC. This article is protected by copyright. All rights reserved.
    Print ISSN: 0020-7136
    Electronic ISSN: 1097-0215
    Topics: Biology , Medicine
    Published by Wiley-Blackwell
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