It's quite odd because we're told that there is no absorption systemically with vaginal estrogen - or such a tiny amount that it's not relevant.
If it was was absorbed systemically, women would need to take progesterone occasionally to reduce the womb lining. This was suggested years ago but has now been changed to unnecessary.
I'd like a link to the actual study because it appears that the results were based on just over 800 women and there's no detail about all the other factors that may have been a factor.
It's badly reported as it talks about hormone-sensitive and then estrogen - driven. And the photo is of pills not cream!