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Growth curves of Tfk-1 xenografts in the three treatment groups over the 35 day experiment. The antitumour activity of Vp16 on the xenografts was facilitated in the presence of Pk11195. Animals were treated for a 72 hour period during each of the two sensitising schedules. The effects of Vp16 on xenograft growth were altered by addition of Pk11195 to the treatment regimen.
