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quick answer--as in most things it may be complicated and much if not
most is still unknown
They have found that some cancers have receptors for blood-formation stimulating compounds and then when those are used they actually encourage the cancers to grow more
There may also be other effects related to the increase in oxygen supply etc
It seems to be more complicated than all this--I encourage you to use the search function on the yellow bar above to look up abstracts, links etc posted on this site on the matter
Noone knows what amount might be safe/dangerous
The drug companies have been trying to find out the former as they have no doubt lost a lot of revenue associated with these very expensive drugs
Sorry I don't have time for any more extensive answer--but the bottom line
from my reading is THEY DON"T SEEM TO HAVE IT ALL WORKED OUT YET
Try not to worry. Hundreds of thousands of others took the same drugs and it took them a long time to even get suspicious. If it were terrible, they probably would have had an inkling sooner. Sorry if this doesn't help!
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