I doubt if it helps but the taxotere drugs come from yew trees!
Taxotere belongs to a class of chemotherapy drugs called plant alkaloids. Plant alkaloids are made from plants. The vinca alkaloids are made from the periwinkle plant (catharanthus rosea). The taxanes are made from the bark of the Pacific Yew tree (taxus).
All natural - just as difficult!! As someone on the wrong side of a 1000 to 1 shot recently (not cancer related) it all depends on where the numbers fall for you. I'd tend to go with what is recommended - if it's chemo, and it is really awful you can stop. AIs have side effects too, so best to get information on both and consider your options, rather than avoiding chemo at any cost. It's hard though - best wishes.