UPR-induced resistance to etoposide is downstream of PERK and independent of changes in topoisomerase IIa levels.
Mann MJ, Pereira ER, Liao N, Hendershot LM. UPR-induced resistance to etoposide is downstream of PERK and independent of changes in topoisomerase IIa levels. PLoS One. 2012; 7(10):e47931.