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Concentration of ganciclovir (GCV) yielding 50% growth inhibition (IC50) in vitro in parental A549 cells, and in SET‐ or HRE–SET‐infected cells exposed to radiation with normoxia (R + N) or hypoxia (1%) (R + H). Cell viability was assayed by using the trypan blue exclusion test. The IC50 was calculated using curve‐fitting parameters. Versus SET: ##P < 0.01; versus R + N: **P < 0.01.
