Last Friday at the Prima Biomed AGM, Lucy Turnbull used her chairman's address to announce that she was leaving the company the next day, handing the reins to scientist and long-term board member Dr Russell Howard.

Prima Biomed may be a small-cap, but it was a remarkably quiet exit for one of the country's most high-profile company directors, going by the (lack of) media coverage in the early part of this week.