Sentence 1: A new study, conducted in Europe, found the medicine worked just as well as an earlier disputed study, sponsored by ImClone Systems, said it did.

Sentence 2: Doctors concluded Erbitux, the cancer drug that enmeshed ImClone Systems in an insider trading scandal, worked just as well as an earlier company-sponsored study said it did.

From 0 to 5 (0="no meaning overlap" and 5="means the same thing"), how similar are the two sentences?
3