Fig. 2.

Failure-free treatment duration and overall survival in patients who reached adequate pain control on parenteral hydromorphone (n = 86). Overall survival was calculated from the start of hydromorphone until death or end of the study (black dotted line); duration of hydromorphone use (grey dashed line). Failure-free survival was defined as the period from the start of hydromorphone until death or the application of more invasive techniques (light grey line)