Time Value of Money is important and something I slowly learned to manage well a few years back.
Nonetheless, timing around expected news always hard to perfectly manage. With a stock like Anavex tempting/wise not being too refined about timing.
If fire and forget investing, perhaps best strategy to buy in at confirmatory trial stage before any readouts, including the surprise or interim ones.
All on the prerequisite that prior DD is done, eh diligently!
If one is a keen swing trader of course volatile stocks, such as biotech can be entertaining in between binary events.
Whatever your investment and risk management strategy, remember to stick to your principles!