Almost all of these vaccines, however, are in Phase I clinical trials--early-stage tryouts meant to judge safety, not effectiveness.

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The excitement over Canadian-based YM and its presentation of data from phase I and II clinical trials at ASCO centers not only on its positive data on myelofibrosis but on indications its JAK inhibitors may also have applications in solid tumors, as well as inflammatory diseases, says Chrystyna Bedrij, biotech analyst at Griffin Securities.

FORBES: YM Biosicences: Its Data at ASCO On Drug for Bone Marrow Disorders Catapults Its Stock

While other pharmaceutical companies have paid large amounts of cash for biotech drugs that had nearly completed human testing, Roche (otc: RHHBY - news - people ) has been sticking mostly to those that are in the earliest (phase I) or middle (phase II) stages of clinical trials.

FORBES: Roche Goes For Early Stage Biotechs