In do not think that you can have an "universal" protocol for any type of human cancers.
You have also to deal with the tumor-associated cell populations that can grow more rapidly than the tumor cells themselves when you are establishing your primocultures.
You should contact Prof. Walter Berger (who is registered on RG) and who, with his team, established a lot of primocultures.
We establish primoculture from glioblastoma tissues.
Here attached is a movie: 72h of observation of the spreading of the tumor cells from the tumor piece (left-bottom of the image), speed up to < 1 min.
You can see the impressive spreading of the tumor cells from the tumor piece.