Stimulated proliferation of yeast itself?

[BOCDC at CCVAX.SINICA.EDU.TW]

Hi,
      Does anybody know any case or references about abnormal recombinant yeast 
or special yeast strain that does not inhibited but stimulated by 
expression of heterologus protein in itself? 

       In my yeast study, growth-stimulated yeast transformants 
that enriched from inhibited population was found, distinctive morphology 
and  higher  survival rate were also characterized, I wonder whether the 
proliferation of the abnormal yeast transformants become cancer-like 
or not, I am trying to define this phenomenon, any suggestions would be 
helpful. Thanks.

Dz-Chi Chen
BOCDC at CCVAX.SINICA.EDU.TW