Cancer is one of those signs that knows how to go all-in. You may be the last one standing in your relationships, or just want to put in as much work on a situation as possible, so you can make sure they're really done.
Letting go proves to be difficult at times. Your skills make you a great employee. Tenacity ensures that you always finish your project, usually ahead of any deadline, and always get the client, sale or account you need to succeed.
You're like a dog with a bone sometimes, until you get exactly what you're after.