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Talimogene laherparepvec (T-VEC) is a herpes-simplex-virus derivative intended to selectively replicate within tumors and produce granulocyte macrophage colony-stimulating factor (GM-CSF), which enhances immune responses.
In 436 patients with injection-accessible tumors of unresectable advanced melanoma, T-VEC was compared with GM-CSF to see which agent delivered more durable response. Overall survival and overall response rates were also compared. Significantly more T-VEC recipients than GM-CSF recipients achieved a response that endured 6 or more months. In addition, the overall response rate was higher among T-VEC recipients. Median overall survival was 23 months with T-VEC, versus 19 months with GM-CSF. Time to treatment failure was long…