I think you are missing the point of that paper. It doesn't sound like it was some forward looking paper but rather an effort to put what we already knew into w

I think you are missing the point of that paper. It doesn't sound like it was some forward looking paper but rather an effort to put what we already knew into words. Since then a big row of antibody treatments have entered the market with big success, which in turn means that our current understanding of cancer has evolved. The idea of the immune system playing a big role was not proven back then.