I believe this is untrue. A BBC article states 'Despite the injection having no serious side effects, almost a third of the 1,045 men in the two-and-a-half year trial did not complete it and no reason was given for this...' which means perhaps 300 men dropped out. If you're referring to the '1 in 100' statistic they quote, that's been scaled down to give easier visualisation.
Oops, sorry my concentration is not what is was and I missed that bit - I should refrain from commenting on stuff these days that requires close reading.
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