oleander and other supplements?

For some time now I've been giving my beloved cat several supplements to inhibit his fibrosarcoma. I've just now begun to give him an oleander extract that I made at home according to directions given to me. In addition to oleander extract (cooked down 4 hrs) this recipe also called for fresh aloe, bloodroot, and chaparral.

My question is- would you recommend withholding the supplements I've been giving him? OR are any or all in the list OK to give along with the oleander tonic?

Here are the supplements:
curcumin
fish oil w/ high epa and dha
skullcap
red clover
folic acid
IP-6 (inositol hexaphosphate)
Transfer Factor- immune booster (bovine colostrum, etc)
L-Arginine
Complex of Grapeseed, Pine Bark and Green Tea
Tonalin CLA

In his food I put:
Alpha Lipoic acid
Quercetin/Bromlain
Vit E
Pau D'arco

By the way-- he's been fighting this cancer with supplements and 3 surgeries (to remove the growth it returns locally) for 2.5 yrs when the vet gave him 6 months! He is happy and very active!

Thanks for any advice!