What are cookies?
Cookies are small text files that are placed on your computer by websites that you visit. They are widely used in order to make websites work, or work better, as well as to provide information to the owners of the site. A cookie often contains a unique number, which can be used to recognise your computer when a user of your computer returns to a website that it visited previously.
Changing your cookie preferences
The "Help" menu in the toolbar of most web browsers will tell you how to change your browser's cookie settings, including how to have the browser notify you when you receive a new cookie, and how to disable cookies altogether. An online guide is available(link is external) if you have difficulties trying to change your browser settings.
We have classified our cookies into two broad types - 'first party cookies' and 'third party cookies':
- First party cookies are cookies that are served directly by the website operator to your computer, and are often used to recognise your computer when it revisits that site and to remember your preferences as you browse the site.
- Third party cookies are served by a service provider on behalf of the website operator, and can be used by the service provider to recognise your computer when it visits other web sites. Third party cookies are used for a variety of reasons, most commonly used for website analytics or advertising purposes. More details are provided in the third party cookie section.
In addition, cookies may be either 'session cookies' or 'persistent cookies'. Your computer automatically removes session cookies once you close your browser. Persistent cookies will survive on your computer until an expiry date specified in the cookie itself, is reached.
List of the main cookies used on our website
|Type and location||Purpose||Cookie name/Contents/Expiry|
|Persistant across www.cancerresearchuk.org and all other web platforms of Cancer Research UK||These cookies help make sure our images appear correctly on your device.||
Store information about the size of your browser window. Expires within 24 hours.
|Session across www.cancerresearchuk.org and all other web platforms of Cancer Research UK||These cookies determine whether to provide rich functionality like dropdown menus.||
|Session across www.cancerresearchuk.org and all other web platforms of Cancer Research UK||These cookies are used to keep a status of your session as soon as you visit the website. This is required should you wish to login to the website.||
Randomly generated identifier assigned to uniquely identify a user's session. Expires within 30 minhutes of the browser closing.
Third party cookies set by Cancer Research UK
We work with a number of third party suppliers who set cookies on our website to enable them to provide us with services. These cookies are mainly used for reporting and advertising purposes so that we can improve the way we communicate with our supporters and ensure the money we invest in online advertising is well spent. More information about the main suppliers we use and their privacy policies is listed below.
We use DoubleClick cookies to measure the effectiveness of our online advertising. This enables us to ensure that any money we spend on digital marketing gives us a good return on investment.
DoubleClick cookies do two things: 1) they track anonymised conversion data so that we can measure advertising effectiveness and 2) they are used to serve advertising, enabling us to serve advertisements to or exclude people who have visited our website. The cookies also allows us to limit the number of times a person sees our advertisement.
DoubleClick cookies sometimes include a pixel from the advertising networks we work with. This allows us to target adverts effectively on their networks.
Cookies: DSID, IDE
Google Analytics and Optimize 360
Google Analytics 360 is a web analytics service provided by Google inc. that enables us to measure how people use our website using cookies. We use this information to improve our website experience for website visitors and to measure the effectiveness of our online advertising. We can also use these cookies to serve relevant advertisements to people who have interacted with specific sections of the site, or to exclude those audiences from advertising.
Google Optimize allows us to test variants of web pages and see how they perform against an objective that we specify. Optimize monitors the results of our experiment and tells us which variant has the best performance.
Cookies: _ga, __utma, __utmb, __utmc, __utmz, __utmv, _gaexp
Cookies: c_user, datr, fr, pl, sb, wd, xs
Optimizely is a website analytics tool we use to try different versions of our website pages to our visitors to see which page people prefer. We use this information to understand how our supporters are using the Cancer Research UK website so that we can improve their experience.
Cookies: optimizelyBuckets, optimizelyEndUserID, optimizelySegments
HotJar is a website analytics tool we use to see how our supporters are moving around our website and get feedback through surveys, so that we can improve their experience and help ensure they can find what they are looking for.
Cookies: _hjClosedSurveyInvites, _hjDonePolls, _hjMinimizedPolls, _hjDoneTestersWidgets, _hjMinimizedTestersWidgets, _hjIncludedInSample
We also use additional cookies from third party advertising or analytics partners on a short term basis. These help improve the effectiveness of our advertising, for example by enabling us to reach or exclude our website visitors across partner networks. These cookies are listed as of the time this page was updated and is reviewed regularly.
Cookies set by third parties
If you go on to a page on our website that contains embedded content, for example YouTube, you may be sent cookies from these websites.
Our website also contains embedded “share” buttons to enable users of the site to easily share articles with their friends through a number of popular networks, for example, Facebook and Twitter. These sites may set a cookie when you are also logged in to their service.
We do not control the setting of these cookies, so we suggest you check the third party website for more information about their cookies and how to manage them.