<qa>  What is the treatment effect on overall survival, feasibility, efficacy and safety of alternatingTo estimate the treatment effect on overall survival, feasibility, efficacy and safety of alternating treatment cycles of gemcitabine monotherapy followed by nab-paclitaxelgemcitabine relative to standard continuing nab-paclitaxelgemcitabine cycles in first-line treatment for metastatic pancreatic cancer in patients having received 3 cycles of induction therapy with standard nab-paclitaxelgemcitabine. 