Considerable public funding goes into research.  To the dismay, though, of many, European countries in the main are very poor at commercialising this research, and thus return of this public investment is often zero euros.
Reasons lie in at least two places:

EU member states (outside of the ‘anglo’ tradition) tend to ‘own’ their own research facilities, [...]

The British have raised the issue that cross-border healthcare will only benefit the few:

All EU citizens, not just the wealthy or well informed, must be able to benefit

Baroness Howarth of Breckland, of the House of Lords’ EU Committee
Is this fear or concern justified?
The whole point of enabling European citizens to have access to healthcare [...]