Originally i did agree that injecting tumour was impractical or...

Originally i did agree that injecting tumour was impractical or of no value but my mind was changed when i heard the tragic news of a friend whose child had an inoperable brain tumour. At that point i wondered if inoperable would allow a needle to be applied, assuming it could be accessed. If so then surely even if you can't completely eradicate the cancer this treatment might buy time. With your apple analogy yes maybe we wouldnt hit the entire tumour but surely this approach achieves similar to eye application as it could limit off target effect or sink effect of being absorbed by non targetted cells.
Maybe used in conjunction with immunotherapy type solutions to extend survival and allow the immuno therapy to take hold.

obviously i have no idea if what i am suggesting is complete nonsense but based on what i have learned following pyc i cant help but wonder. I thought in the early days they actually presented results based on injecting tumors with omomyc. At that time i thought what use is that in the real world but since having been aware and then hearing if inoperable tumors that kill and quite quickly, now i have a different perspective.