News digest – oesophageal cancer, HRT, Leveson and more

If you missed the news this week, read this article

Amid the drama of phone hacking, economic gloom, ‘responsible’ capitalism and sinking cruise ships, the week has also seen several intriguing stories in the world of cancer research.

Here’s our regular digest of the latest developments – just click on the links for the full low-down.

HRT and breast cancer

The link between hormone replacement therapy and breast cancer was back in the news, as researchers published a critique of the landmark Million Women Study (which we help fund). In response, the Study’s authors mounted a robust defence of their work, pointing out that theirs was one among many other studies to find that HRT increases the risk of the disease.

Our news feed covered both sides of the story, while Judith Potts in the Telegraph wondered what to make of it all.

Drugs ’cause cancers to spread’?

Somewhat alarming headlines on Wednesday suggested that certain targeted cancer drugs might inadvertently cause cancers to spread. But we felt this was a bit of a leap, given that the stories were based on lab research not patient data.

In fact, the study focused on a type of blood-vessel cell called a ‘pericyte’, and its role in the spread of cancer. And the findings of increased rates of spread haven’t yet been observed in patients, as our expert Professor Kebs Hodivala-Dilke pointed out in a more balanced take on our news feed.

Detecting oesophageal cancer earlier

A study on detecting oesophageal cancer early, which we co-funded with the Medical Research Council, showed that a fluorescent dye could be used to spot the disease. We put out a press release to accompany it, which was picked up by several news outlets, including the Daily Mail and The Sun.

New gene linked to oesophageal cancer

Sticking with oesophageal cancer, researchers in London pinned down the gene behind tylosis, a rare skin condition linked to the disease. This discovery will lead to new insights into how oesophageal cancer develops, and – possibly – new ways to treat it. Cancer Research UK helped fund the study, and our news feed has the details.

Understanding side effects

An intriguing story appeared on Thursday. An international team of researchers, including some we fund, found out how vemurafenib – a new targeted melanoma drug - also causes some people to develop a second, less serious form of skin cancer. Their results also showed how, in principle, this could be avoided.

We think this is a great example of the difference between the new generation of cancer drugs and the previous one – researchers are already starting to identify and work around problems like side-effects and drug resistance, even before the drugs are in routine use.

New drug for ovarian cancer

On Tuesday, several papers got very excited by the news that the European Medicines Agency had licensed a drug called bevacizumab (a.k.a. Avastin) for ovarian cancer. The drug is now available in the UK via the Cancer Drugs Fund. This is a welcome step forward, as trials suggest the drug can delay the cancer from coming back in women with advanced disease.

However, as our expert Professor Iain McNeish told reporters, there are still questions over its use, particularly whether the drug – which is very expensive – actually prolongs life overall. Still though, we urgently need new treatments for the disease, and this drug looks promising.

Statins and cancer?

The Express ran a front page about how statins – used to treat heart disease – can ‘beat cancer’. This unfortunate headline was the result of a very complex bit of lab work looking at the role of a protein called p53 in a cellular pathway called the mevalonate pathway. Without getting bogged down in the detail, it didn’t show that statins can be used to treat cancer. Our spokesperson, Dr Jo Owens, had the final word in the story:

“To say that statins are a potential new cancer treatment is to oversimplify a very complicated picture. These are laboratory findings and, as the researchers themselves point out, there’s a long way to go to find out if they apply to patients”.

The Leveson Inquiry

Which leads us on to our final story of the week. In the wake of the phone hacking scandal, the government commissioned the Leveson Inquiry to look at standards in the media.

One of the less headline-grabbing aspects of the inquiry is its investigation into standards in science reporting. Our colleagues at the Wellcome Trust invited us, together with the Association of Medical Research, to help draw together some thoughts as to how the situation can be improved. You can read our joint submission here (pdf).

That’s all – see you next week,

Henry

The causes of cancer you can control

Can cancer be prevented? Decades of research have shown that a person’s chances of getting cancer depends on a mishmash of their genes and their environment, but also certain aspects of their lives, many of which they can control.

Today saw the publication of a landmark Cancer Research UK-funded review by Professor Max Parkin, outlining the latest evidence behind the preventable causes of UK cancers.

As our press release says, these latest calculations, based on predicted cases  for 2010, show that smoking, diet, alcohol and obesity are behind more than 100,000 cancers. This is equivalent to one third of all cancers diagnosed in the UK each year.

And this figure further increases to around 134,000 when taking into account all 14 lifestyle and environmental risk factors analysed in this study.

There’s more in-depth information about the statistics on our website, and our healthy living pages explain the take-home messages from the research.

But to help make sense of the vast quantity of information contained in the 91-page report, we’ve also put together a graphic that shows the proportion of cancers that can be prevented through lifestyle changes. It’s worth spending a minute or so looking at the key to understand how to interpret the graphic (which you can download as a larger PDF version).

Attributable risk infographic

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The Pill and prostate cancer

The Pill

Latest research does not suggest the Pill causes prostate cancer

This morning we woke up to headlines proclaiming that women taking the Pill could increase the risk of… prostate cancer.

That might sound silly – women don’t even have prostates, after all – but it seemed to be what the study concluded.

But as quite often happens, it’s not quite as simple a story as it seems. Let’s take a look at what the researchers actually did, and what they concluded.
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The Pill, pregnancy and cancer – making sense of the headlines

Are all ‘side effects’ bad for your health? In the case of the birth control Pill, it seems not.

Today, a study that we helped fund has confirmed that the combined Pill isn’t just an effective contraceptive, but that it also gives women long-lasting protection against ovarian cancer. Women who took the Pill for any length of time had a 14 per cent lower risk of ovarian cancer than those who never took it.

And women in the study who’d taken the Pill for 10 years were almost half as likely to develop ovarian cancer compared with women who’d taken it for less than 1 year. The below graphic shows how many women this equated to:

The study has been widely covered in the media, and these headline statistics are likely to be reassuring for the many thousands of women who take the Pill in the UK and across the world.

And women who have had kids also have reason to be positive – the study also confirmed that they have a reduced risk of ovarian cancer. Women in the study who’d been pregnant had their risk of ovarian cancer reduced by almost one-third (29 per cent), compared with women who hadn’t.

But what should an ‘average’ woman conclude from these numbers? Can any explicit advice be given based on the evidence? Continue reading

Oestrogen causes DNA mutations – is this how it fuels cancer?

Oestrogen can lead to mutations in DNA, according to new research from Cancer Research UK

Oestrogen can lead to mutations in DNA, according to new research by Cancer Research UK scientists

The evidence that the sex hormone oestrogen is involved in cancer is overwhelming.

For example, breast cancer is more common among women who take HRT and the Pill for long periods, both of which add oestrogen to the body’s natural levels. And this most common of cancers is intimately linked to levels of the hormone over a woman’s life.

Oestrogen is also involved in cancers of the womb and ovaries, and, potentially, prostate cancer.

But we understand little about exactly how oestrogen affects the internal chemistry of our cells so that they become more likely to divide out of control. Several theories have been put forward, but scientists are still working hard to figure this out.

Some think that oestrogen encourages certain cell types to divide more often, and that the increase in cancer risk can be explained by the simple fact that more cell divisions means a greater likelihood of cancer-causing mistakes being made.

Others think that oestrogen turns on certain genes inside cells at the wrong time, and that this encourages cancer – for example, by preventing damaged cells from dying.

And finally, there’s laboratory evidence that oestrogen can directly bind to, and damage, DNA – although quite whether this occurs in real life, is far from clear.

But new research published today by Cancer Research UK scientists, with support from a team in Spain, adds a new theory to the mix – one that’s as least as strong as the others. And intriguingly, their research points the finger at the immune system, the body’s in-built self-defence mechanism.

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Listen to the November podcast

This month’s podcast is packed with highlights from the National Cancer Research Institute Cancer Conference – the biggest of its kind in the UK.

Cancer Research UK’s Professor Michel Coleman discusses whether the UK really is the “sick man of Europe” when it comes to cancer care and survival.

Looking back over centuries of research, Professor Valerie Beral explains how women’s childbirth and breastfeeding patterns could be the key to preventing breast cancer.

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NCRI Sunday lectures – bookmarks, blood vessels, dignity, and the real cause of breast cancer

Sunday afternoon at the NCRI conference was packed with talks from some of the world’s leading cancer experts.

Kat’s already blogged about Michel Coleman’s public lecture on cancer survival in the UK versus Europe, and we’ll be bringing you more in-depth posts about some of the main sessions once we’ve written them up.

But for now, here’s a taster of Sunday’s plenary sessions.

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