Thank you for your last answer.  A two part question for you:

1.  I am wondering if on a bone scan, the bones actually have to be turning over DURING the scan to make it show a positive?

I found this article on wikipedia that says this:
The nuclear medicine scan technique is sensitive to areas of unusual bone-rebuilding activity because the radiopharmaceutical is taken up by osteoblast cells that build bone. The technique therefore is sensitive to fractures and bone reaction to infections and bone tumors, including tumor metastases to bones, because all these pathologies trigger osteoblast activity.

It would seem, that just the presence of extra osteoblastic cells would make the tracer show a positive scan. And then the bones wouldn't have to be turning over DURING the scan.

Is this true?

2.  I also read ( NOT on wiki)  that lobular cancer, since it grows slowly, might not make the osteoblasts active enough, and that would give a false negative?  Does that make sense?  It would seem to me that if you have osteoblastic cancer, and extra osteoblasts around it, that the slow-growing part wouldn't matter?  Does that make sense?