Douglas Harper's Etymology Dictionary
proliferative
1868, from proliferate + -ive.
Wiktionary
proliferative
a. 1 (context not comparable cytology English) of or pertaining to proliferation, especially of cells 2 proliferating; tending to proliferate
Usage examples of "proliferative".
It showed a rather normal endometrium in the proliferative phase, but the stain stopped me.