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巧克力和起泡饮料可做癌症探测仪

2013-07-08    来源:英语点津    【      美国外教 在线口语培训

Chocolate and fizzy drinks could be used as cancer detectors

Chocolate, fizzy drinks and other sugar-laden foods could soon be used to detect cancer.

Scientists have developed a technique that identifies the disease by tracking how sugar is absorbed by the body.

Malignant tumours consume much more glucose – a simple sugar – than healthy tissues in order to feed their rapid growth.

By adjusting an MRI scanner to look for glucose uptake, researchers at University College London discovered tumours glowed brightly during imaging, after something sweet had been consumed.

The breakthrough provides a safer and simpler alternative to standard radioactive techniques, and could be available in as little as 18 months.

Due to the need for radiation, the current method of scanning is not recommended for pregnant women and children, and only available at a limited number of larger hospitals and specialist centres.


In contrast, MRI facilities are commonplace, meaning less travel for patients. And as there are no adverse effects from the technique, it can be used on a frequent basis to track whether a cancer is responding to therapy and tailor a patient’s treatment.

As well as being cheaper and safer, the new method also raises hopes of improved survival rates.

Senior author Professor Mark Lythgoe, director of UCL’s Centre for Advanced Biomedical Imaging (CABI), said the results had been unexpected.

He said: ‘I certainly didn’t believe it as possible to fine tune an MRI scanner to pick up glucose movement even 18 months ago. But our research proves it can be done.

‘It can be done after consuming a sweet drink, like a cola or a fruit juice, or food. We can detect cancer using the same sugar content found in half a standard sized chocolate bar.’

In the study, published in the journal Nature Medicine, the team tracked tumours in mice with bowel cancer. They found the cancerous growth was detectable by an MRI scanner following glucose ingestion.

The method has also been trialled on a handful of cancer patients with early signs of success.

He said: ‘It was promising. You could see the uptake of the glucose in the area around the tumour.’

Unlike the current method of scanning, known as positron emission tomography (PET), which requires a trace amount of a radioactive substance to be injected into a patient, the new technique is needle free.

‘Effectively you don’t even have to give a patient an injection, as sugary food is absorbed so quickly, so it will be good news for those who don’t like needles,’ said Professor Lythgoe.

He added: ‘As for PET, there is always a small risk associated with anything involving radioactivity. So it can only be used sparingly, and is not suitable for pregnant women or children.

‘Too much radiation can damage DNA, and can either result in cell deaths or some cellular damage which can lead to secondary cancerous growths.

‘But with glucose scanning, there are no adverse effects, so it can be carried out much more often. If a doctor wants to follow up how a cancer is responding to treatment then they can scan the tumour on a weekly, or even a daily basis.’

Lead researcher Dr Simon Walker-Samuel, also from CABI, said the newly-developed technique used radio waves to magnetically label glucose in the body.

‘This can then be detected in tumours using conventional MRI techniques,’ he said. ‘It could offer a cheap, safe alternative to existing methods for detecting tumours, which require the injection of radioactive material.’

Clinical trials are now taking place, said Professor Lythgoe, who added: ‘We don’t have to refine the technique, as it stands it works. In a year’s time, we will be able to see hospitals picking it up.’

Dr Kat Arney, Cancer Research UK’s science communications manager, said: ‘Researchers have known for many years that cancer cells produce energy and use sugar slightly differently from healthy cells.

‘This exciting experimental scanning technique, suggests that regular, non-radioactive glucose can be used to detect bowel tumours in mice. It’s got the potential to become a safer, cheaper way of diagnosing and monitoring cancer, so the next step is to test it in patients – using controlled doses of pure glucose rather than sweets or chocolate -  to see how well it works in the clinic.’

据英国《每日邮报》7月7日报道,巧克力、起泡饮料和其他含糖食物将很快可以用来探测癌症。

恶性肿瘤为了满足它们快速的生长会比一般健康的组织消耗掉更多的葡萄糖。科学家们据此发明了一项技术来探测糖分是如何被身体吸收的,从而诊断病情。

来自伦敦大学学院的研究人员通过核磁共振成像检测仪来测试葡萄糖的吸收,并发现恶性肿瘤在人体内吸收了一些糖分后变得锃亮。

该项发明取得了重大突破,且比普通的放射技术要安全,而且操作起来更简易,最快有望在未来的18个月内问世。

放射技术只局限于一些大医院和医疗中心,而且它也不适用于孕妇和儿童。与此相反,核磁共振成像检测仪则比比皆是,这可以减少患者的旅途奔波之苦。并且由于技术不存在任何副作用,它可以被频繁使用于检测癌症患者是否对治疗有所反应,从而对症下药,为病人量身定做治疗方案。

除了安全便宜外,新方法还提升了癌症患者存活的希望。(中国网)


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