I signed the form but did not understand it. What now?

Come back and say so. Nothing bad happens. We go through it again, as slowly as you need, and you can still change your mind afterward.

Consent forms are famously hard to read, and many are written above the level most adults can follow, so the difficulty sits in the document rather than in you.

Written by two physicians. Checked against patient information from the US National Cancer Institute and Cancer Research UK.