Bayesian dose forecasting has been used extensively around the world, but its use in a clinical setting (where magnitude of benefit has been systematically studied - see here) has been previously isolated to pockets of clinicians who were familiar with the technology and had a good understanding of both IT and mathematics. It is used in hospitals such as St Jude's, The Mater (Brisbane), St Vincent's (Sydney), Christchurch Hospital, a variety of Melbourne teaching hospitals, Cincinnati, USC and The Hague Hospital network.
For a deeper look at Bayesian dose individualization, we would recommend the following papers:
Burton et al. would be a recommended introduction to the mathematics of Bayesian dose individualization, with Thomson et al. being a useful review of the area. As you can see from the last paper, Bayesian dosing has been around for quite some time.