HopeMisery, is all Darzalex from JnJ administered using Enhanze technology from HALO?
If the answer is yes, and JnJ announces this 54% Darzalex sales increase (which is normally audited information when made public), then your assumption seems to be correct.
However, from Halozymes Pipeline only DARZALEX FASPRO™ [daratumumab and hyaluronidase] for Oncology Multiple Myeloma seems to be approved by the FDA.
So I think you may have to check if the 54% relates to ALL Darzalex or just to the above mentioned condition and at what % administration is Enhanze based.