Howard de Walden Estates' withdrawn application at 141-143 Harley Street, a road in London synonymous with all things medical, was for 'use swap' purposes.
It did not involve any works to the building which are part of creating the facility, the AIM firm said.
Indeed, the available space for the centre has increased by around 50% allowing for an additional treatment room and additional imaging facilities, it added.
Howard de Walden Estates, which are bearing the total cost of the re-development, are satisfied that progress for the site remains on track.
Advanced Oncotherapy shares lost 1.85% to stand at 6.625p.