Hi @AT404
This is a query you should putting to your oncologist as we are all different (i.e. different cancers of different grades, different treatments and we are of different ages) and the statistics they use for their percentages are calculated on all these factors.
In my case, age and other health issues as well as medications, they determined that statistics to show that there was minimal benefit in relation to the possible side effects.
If the use of the drugs concerns you do seek guidance from your medical team. In the end, though, it is your decision as to whether to take them - they can only recommend.
Just be sure you won't later regret the decision you make.
Hugs Summer :-)