Investors responded negatively to Sophiris Bio Inc.’s data release for its Phase IIb localized prostate cancer therapy topsalysin on June 25, as the report of one patient death among 11 who received a second dose of the intratumoral injection overshadowed solid clinical response data from the 38-person trial. San Diego-based Sophiris saw its shares finish trading down 40% at $2.24.
Topsalysin is a first-in-class, transmembrane pore-forming protein that is genetically modified to be activated only by