 In addition, the efficacy of Hudson's treatment for what he deemed "early" cancers using methods such as radical surgery, castration, and diethylstilbestrol therapy was still unknown at that time.However, despite this, Hudson's studies were still cited in many urological journals and textbooks in the late 1950s and 60s as a new way to inspect the prostate.Only in a comment by the National Institutes of Health in a response to one of Hudson's requests for funding do they consider malpractice, asking for documentation of his compliance Public Health Service policy.