Variable: First and foremost, not all breast cancers spread: many are confined to the breast without any ability to travel to other organs. For those that 'spread', the growth rates vary between months to decades before they become detectable. Furthermore, chemotherapy may eradicate these cells that have spread, and they may never become evident.
Answered 10/10/2011
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Varies: Each cancer is unique. Some cancer cells have the ability to metastasize very early in their development while other can be slower to metastasize.
Answered 12/9/2013
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