○ The Fulushima Crisis 375; "CT Scans of Children Raise Cancer Risk" CTで白血病リスク3倍.

2012-09-12 08:25:04 | ♪PFK ASAP NEWS



06/10/2012 English med. magazine "The Lancet" . Dr. Michiyuki Matsuzaki .afpbb.com. Tokyo Shimbun (kyodo). and
PeacePhilosophy. Prof.Mark Pearce.Newcastle univ.

" -- English med. magazine "lancet" paper: -- CT Scans of Children Raise Cancer Risk" whose brain tumor and leukemia of a child increase intentionally by contamination of about 50 millisieverts (Dr. Michiyuki Matsuzaki comment)
The paper of the English med. technical magazine "lancet" that a carcinogenic risk goes up by the CT at the time of childhood on June 7 was announced.
The comment is obtained from Dr. Michiyuki Matsuzaki of the Hokkaido Fukagawa hospital with what explained in Japanese the graph which shows that a carcinogenic risk goes up intentionally from contamination of about 50 millisieverts.
It is below Matsuzaki doctor's comment.
1)
The increase in a significant disease risk is observed statistically [ a child's leukemia and a brain tumor ] near 50-mm gray (millisievert).
Coming out to a slight degree and becoming significant also with the dose not more than it, of course, is predicted.
This paper was written in order to trace from the first what cancer a child's CT inspection is generating and to reconsider the problem of the merit in sick diagnosis and therapeutic aspect, and the demerit of radioactive exposure, but There is we meaning of an about in the proof which shows that the opinion said below 100-mm Shibel is "safe" is an error further having been added.
at the beginning of a paper, authors are good for the health, not to mention it, which do not have a risk in "low dose contamination -- until -- there are some researchers who claim.
It is described as Some investigators claim that there are norisks, or even beneficial effects, associated with low-dose radiation", It is also one of the paper of this to show clearly whether such an opinion is right.
The position is expressed.
2)
If the head CT is performed once to a less than 10-year-old child, a brain dose serves as 30mSv, a bone marrow dose serves as 10mSv weakness, and it is said to the summary that it is presumed that one brain tumor and one leukemia break out from 10,000 which underwent this CT inspection in the future.
And if the health impairment caused by the radioactive exposure of this level if generating of the other cancer or non-cancer diseases (cardiopathy etc.) is taken into calculation will become still larger, the portion of the design has described it.
3)
It is in several 10-millisievert contamination by CT, and a risk of 1?2 persons telling 10,000 people that they get cancer will be socially permissible if the merit to sick diagnostic treatment is considered.
However, the risk of the contamination burdened by the target on the other hand by the nuclear power plant disaster should be zero primarily.
Moreover, it is a risk of a single figure and double figures exceeding the safety standards (100,000 people's whole life risk is made into one or less person) of asbestos or drinking water.
Therefore, if contamination of about 50 millisieverts is not set to 1/1,100 of 10 more minutes, the existing safety control system and compatibility of this country can be taken.

[Reference report]
AFP.
By the CT at the time of childhood, a carcinogenic risk rise, In Britain 180,000 people Follow-up-survey http: 15:31 on June [ //www.afpbb.com/article/life-culture/health/2882432/90697942012 year ] 07 Place of dispatch : Paris / France [June 7 AFP] CT The investigation paper which a risk of the child who won popularity over many times showing the symptoms of blood cancer, a brain tumor, and marrow cancer behind presupposes may be increased a maximum of 3 times was published at the English medicine technical magazine "lancet (The Lancet)" on the 7th.
The carcinogenic risk with absolute combined teams of Canada, Britain, and the U.S. which investigated stops the irradiance level of the radiation by CT at worst, and if possible, it supposes that it is necessary to use a substitute inspection method, it being small.
It is said that the research team was able to show a direct proof of leading to the increase in a carcinogenic risk after the dose of radiation of the CT received at the time of childhood growing, for the first time by this investigation.
Mark Pearce of the main writer of a paper, and English Newcastle university health and a social research institute (Institute of Health and Society), "the most important one, It is said that it is using CT only when it may be completely justified from a clinical standpoint."
According to the research team, the use in the past ten years, especially the U.S. of CT is increasing rapidly.
But it is said that many especially potential carcinogenic risks to the child who is easy to be subject to the influence of radiation that the ionizing radiation of CT causes are seen.
The research team investigated by selecting those who have the experience which received CT in from a childhood term before [ from the medical records from 1985 of Britain to 2002 ] adolescence (less than 22 years old).
The number which showed the symptoms of leukemia (cancer of blood or marrow) in 2008 after 1985 among 180,000 candidate weakness was 74 persons, and the number of brain tumors was 135.
According to calculation of the research team, the person who has irradiated with the radiation of a total of 30-mm gray (mGy) had a 3 times higher risk of showing the symptoms of leukemia behind compared with the person of less than 5-mm gray.
The risk of the brain tumor increased 3 times by the person exposed to the radiation of a total of 50?74-mm gray.
In investigation, comparison with the carcinogenic risk which the children who have not received CT have is omitted.
Pierce "it is a subject of the highest priority to improve apparatus and to reduce the dose of radiation of CT.
It is said that both not only a radiology meeting but the manufacture maker of apparatus should tackle."
"It may also be appropriate to adopt alternative diagnostic methods which do not use ionizing radiation, such as an ultrasonic wave and MRI (magnetic resonance imaging), depending on a situation."
(c)AFP
Tokyo Shimbun (Kyodo)
It is a child's increase of cancer danger at http://www.tokyo-np.co.jp/s/article/2012060801001452.html CT. An international team will be at epidemiologic survey 12:20 on June 8, 2012.
[Washington cooperation] When the computed tomography (CT) inspection was undergone 2?3 times as a child, international teams, such as English Newcastle University, summarized the epidemiologic survey result that a risk of becoming a brain tumor increased 3 times, and it announced to the English medicine magazine lancet dated the 7th.
A risk of becoming leukemia by 5 to 10 times of CT(s) is also referred to as increasing 3 times.
A team "CT is excellent in quick and exact diagnosis, and short-term profits exceed long-term danger in many cases.
It is insisted that however, 1 time of a dose of radioactivity is made as low as possible, and you should choose there when there is another diagnostic method."
A team investigates about 180,000 less than 22-year-old people who underwent CT inspection in 1985?2002 in Britain.
Contributor Peace Philosopher time: 4:13 AMEmail This
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Label: The Chernobyl Accident Chernobyl nuclear power plant disaster, a Fukushima Nuclear Power Plants Fukushima nuclear power plant problem, In English English contribution, and In Japanese Japanese contribution
5 comments:
Anonymous said...
The meaning of an English title is unknown.
"Cander Risk" is a typo. Is it "CanserRisk" surely?
6:46 PM
It corrected to Peace Philosopher said...Cancer.
Indication gratitude is carried out.
6:52 PM
Resume Bible said ...
It was a very attractive report!!
Moreover, it comes for play!!
Thank you.
.
12:47 PM
Marui U.K. said ...
10,000 people think that they are the probability which may exist if 1?2 persons' onsets of cancer are a medical center in which patients with an advanced disease gather easily regardless of CT, and a medical institution of urban areas.
It waits for verification in many medical institutions also from a viewpoint of reproducibility.
12:45 PM
Marui U.K. said ...
10,000 people think that they are the probability which may exist if 1?2 persons' onsets of cancer are a medical center in which patients with an advanced disease gather easily regardless of CT, and a medical institution of urban areas.
It waits for verification in many medical institutions also from a viewpoint of reproducibility.
12:48 PM
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06/10/2012 英医学誌『The Lancetランセット』.松崎道幸医師. afpbb.com. 東京新聞(共同). and.PeacePhilosophy. Prof.Mark Pearce.Newcastle univ..

"英医学誌『ランセット』論文:50ミリシーベルト程度の被ばくで小児の脳腫瘍や白血病が有意に増える(松崎道幸医師コメント)CT Scans of Children Raise Cancer Risk"

6月7日に、幼少時のCTスキャンで発がんリスクが上昇するという英医学専門誌「ランセット」の研究論文が発表されました。

北海道深川病院の松崎道幸医師から、50ミリシーベルト程度の被曝から発がんリスクが有意に上昇することを示すグラフを日本語で解説したものと、コメントをいただいています。




 以下松崎医師のコメントです。
 1)
小児の白血病、脳腫瘍とも、50ミリグレイ(ミリシーベルト)付近で統計学的に有意な疾病リスクの増加が観察されます。もちろんそれ以下の線量でも、もう少しで有意になることが予測されます。この論文は、もともと、子供のCT検査がどれくらいのガンを発生させているのかを突き止め、病気の診断・治療面でのメリットと、放射線被ばくのデメリットの問題を再考するために書かれたのですが、私たちにとっての意義は、「100ミリシーベル以下は安全」と言う主張が誤りであることを示す証拠がさらに追加されたことにあります。論文の冒頭で、著者等は「低線量被ばくにはリスクはない、それどころか健康に良いとまで主張する研究者もいる。Some investigators claim that there are no risks, or even beneficial effects, associated with low-dose radiation」と述べて、そのような主張が正しいかどうかを明らかにすることも、この論文の一つであ
るという立場を表明しています。

2)
サマリーには、10歳未満の子供に一回頭部CTを行うと、脳線量が30mSv、骨髄線量が10mSv弱となり、将来このCT検査を受けた1万から脳腫瘍1人と白血病1人が発生すると推定されると述べられています。しかも、それ以外のガンや非ガン性疾患(心臓病など)の発生を計算に入れると、このレベルの放射線被ばくによる健康被害はさらに大きくなるだろうと考案の部分で述べています。

3)
CTによる数10ミリシーベルトの被ばくでで1万人に1~2人がガンになると言うリスクは、病気の診断治療へのメリットを考えるなら、社会的に許容可能でしょう。しかし、原発事故で一方的に負わされた被ばくのリスクは、そもそもゼロであるべきです。また、アスベストや飲料水の安全基準(10万人の生涯リスクを1人以下にする)を1桁も2桁も上回るリスクです。したがって、50ミリシーベルト程度の被ばくをさらに10分の1,100分の1にしなければ、この国の既存の安全管理システムと整合性が取れないことになります。

【参考報道】
AFP 
幼少時のCTスキャンで発がんリスク上昇、英国で18万人を追跡調査http://www.afpbb.com/article/life-culture/health/2882432/9069794
2012年06月07日 15:31 発信地:パリ/フランス
【6月7日 AFP】CTスキャンを多数回にわたって受けた子どもは、後に血液がん、脳腫瘍、骨髄がんを発症するリスクが最大3倍になる可能性があるとする調査論文が、7日の英医学専門誌「ランセット(The Lancet)」に掲載された。

調査を行ったカナダ、英国、米国の合同チームは、絶対的な発がんリスクは小さいとしつつ、CTスキャンによる放射線の照射量を最小限に留め、可能であれば代替の検査方法を用いる必要があるとしている。

研究チームは、幼少時に受けたCTスキャンの放射線量が成長後の発がんリスク増加につながるという直接的な証拠を、この調査で初めて示すことができたと述べている。

論文の主執筆者、英ニューカッスル大学(Newcastle University)健康・社会研究所(Institute of Health and Society)のマーク・ピアース(Mark Pearce)氏は、「最も重要なのは、臨床的見地から完全に正当化されうる場合にのみCTを使うことだ」と述べている。

研究チームによれば、CTスキャンはここ10年、特に米国での利用が急増している。だがCTスキャンの電離放射線が引き起こす潜在的な発がんリスクは、特に放射線の影響を受けやすい子どもに多くみられるという。

研究チームは、英国の1985年から2002年までの診療記録から、幼少期から青年期(22歳未満)までの間にCTスキャンを受けた経験がある人を選び出し調査を行った。

対象者18万人弱のうち、1985年から2008年の間に白血病(血液や骨髄のがん)を発症した人数は74人、脳腫瘍は135人だった。

研究チームの計算によると、累計30ミリグレイ(mGy)の放射線を照射された人は、5ミリグレイ未満の人と比べて後に白血病を発症するリスクが3倍高かった。脳腫瘍のリスクは、累計50~74ミリグレイの放射線を浴びた人で3倍になった。

調査では、CTスキャンを受けたことがない子どもたちが持つ発がんリスクとの比較は行っていない。

ピアース氏は「機器を改善して、CTの放射線量を減らすことが最優先の課題。放射線学会だけではなく、機器の製造メーカーも共に取り組むべきだ」と述べている。「電離放射線を使用しない超音波やMRI(磁気共鳴映像法)などの代替診断法を採用することも、状況によっては適切な場合がある」

(c)AFP

東京新聞(共同)

http://www.tokyo-np.co.jp/s/article/2012060801001452.html
CTで子どものがん危険増 国際チームが疫学調査
2012年6月8日 12時20分
【ワシントン共同】子どものころにコンピューター断層撮影(CT)検査を2~3回受けると、脳腫瘍になるリスクが3倍になるとの疫学調査結果を英ニューカッスル大などの国際チームがまとめ、7日付の英医学誌ランセットに発表した。5~10回のCTで白血病になるリスクも3倍になるという。
チームは「CTは迅速で正確な診断に優れ、短期的な利益が長期的な危険性を上回る場合が多い。しかし、1回の被ばく線量はできるだけ低くし、別の診断法がある場合はそちらを選ぶべきだ」と訴えている。
チームは、1985~2002年の間に英国でCT検査を受けた22歳未満の約18万人を調査。

投稿者 Peace Philosopher 時刻: 4:13 AM
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ラベル: Chernobyl Accident チェルノブイリ原発事故, Fukushima Nuclear Power Plants 福島原発問題, In English 英語投稿, In Japanese 日本語投稿
5 comments:
Anonymous said...
英文タイトルの意味が不明です。“Cander Risk”とはタイプミスで、正しくは“Canser Risk”ではありませんか?
6:46 PM
Peace Philosopher said...
Cancer に訂正しました。ご指摘感謝します。
6:52 PM
履歴書バイブル said...
とても魅力的な記事でした!!
また遊びに来ます!!
ありがとうございます。。
12:47 PM
丸井英 said...
1万人に1~2人の癌発症は、CTに関係なく、重症患者が集まりやすい中央病院や、都市部の医療機関なら十分あり得る確率だと思う。再現性という観点からも、多くの医療機関での検証が待たれる。
12:45 PM
丸井英 said...
1万人に1~2人の癌発症は、CTに関係なく、重症患者が集まりやすい中央病院や、都市部の医療機関なら十分あり得る確率だと思う。再現性という観点からも、多くの医療機関での検証が待たれる。
12:48 PM
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note; by Hatena.
computed tomography [U.K.] .. CT.
Equipment which develops on a computer the cross-sectional picture which hit X-rays to the human body from various angles, and was horizontally cut into round slices.
It was developed in Britain and imported for the first time by Japan in 1975.
By the Ministry of Health, Labour and Welfare investigation in 2002, the possession number of the hospitals of the Japan whole country is 7920 sets.
The effect of lung cancer early detection attracts attention, and the clinical test [ validity / the conventional chest X-rays inspection and / for 50,000 people (smokers) ] is done in the U.S.
In the case of a chest, exposure dose by CT inspection is carried out even if it corresponds by 400 times the usual X ray equipment, but a low dose of radiation also has a high-precision product these days.
The International Commission on Radiological Protection (ICRP) shows the requirements for an inspection, such as "avoiding a repeated inspection, if there is no necessity."
In the accident of the Fukushima Daiichi nuclear power plant accompanying the offing earthquake of the Tohoku district Pacific Ocean which occurred in March, 2011, exposure dose will be reported as compared with CT in many cases, and it will be anew observed about contamination of CT.

note; by Hatena.
computed tomography[英]. .CT.

人体に様々な角度からエックス線をあて、水平方向に輪切りにした断面画像をコンピュータ上に展開する装置。

イギリスで開発され、日本には1975年に初めて輸入された。

2002年の厚生労働省調査では、日本全国の病院の保有台数は7920台。

肺がん早期発見の効果が注目され、米国では喫煙者ら5万人を対象に、従来の胸部エックス線検査と有効性を比較する臨床試験が行われている。

CT検査による被ばく量は、胸部の場合、通常のエックス線装置の400倍に相当するともされるが、最近は低い放射線量でも精度の高い製品がある。

国際放射線防護委員会(ICRP)は「必要がなければ繰り返しの検査は避ける」など検査の要件を示している。

2011年3月に発生した東北地方太平洋沖地震にともなう福島第一原子力発電所の事故では、被ばく量をCTスキャンと比較して報道されることも多く、改めてCTスキャンの被ばくについて注目されることとなった。





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