- August 18, 2010 at 2:50 pm
No one knows for sure what happens when you have an "unknown primary". One current thought is that the primary regressed. Regression is when the body attacks and destroys it the lesion. However, it doesn't always happen before a tumor has a chance to send off cells elsewhere. Regression also happens in normal moles and is considered a natural process. At this point in time, I don't believe there are any treatments that are targeted toward those with unknown primaries. Basically, you go with what treatment options are available per your staging. Most likely, you will never know exactly what happened with the primary lesion.