My site, http://www.cancer-study.com, has been hacked, and I can't login to wp-admin.
Can you say how it has been hacked and what can I do to undo the damage? I have access to the host.
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If you do a Google search, you will find many topics on this.
Here are some links:
First read this: http://codex.wordpress.org/FAQ_My_site_was_hacked
Then take a look at these links:
If you have access to your database, login using PHPMyAdmin and change admin username / password, delete users you don't know and change password for rest.
Then start the process of backing up data and do a clean install.
Note. If you can't find out how they got access to your site, doing a clean install and putting back data, will still leave whatever hole open.
Also not that backdoors (links / code) could have been added to your posts, so all content must be checked before you import exported data.