fˈoːɹ kˈeɪsᵻz ʌv pˌiːˌɛmˈɛl wɜː ɹᵻpˈoːɹɾᵻd ɪn plˈæk sˌoːɹɪˈɑːsiz pˈeɪʃənts, ɐn ˈɪnsɪdəns ʌv ɐpɹˈɑːksɪmətli wˈʌn ɪn fˈaɪvhˈʌndɹɪd tɹˈiːɾᵻd pˈeɪʃənts.
Four cases of PML were reported in plaque psoriasis patients, an incidence of approximately one in 500 treated patients.