PRMT5 Inhibitor for Use In A Method of Treating Psoriasis and Other Autoimmune Conditions

1 . A method of treating a subject suffering from an autoimmune disorder comprising administering to said subject in need of a therapeutically effective amount of a PRMT5 inhibitor.

2 . The method of claim 1 , wherein the PRMT5 inhibitor is (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl) oxy)-5-(4-methyl-7H-pyrrolo [2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol or a pharmaceutically acceptable salt thereof.

3 . The method of claim 1 [or 2], wherein the autoimmune disorder is selected from the group consisting of psoriasis, atopic dermatitis, alopecia areata, ankylosing spondylitis, asthma, type 1 diabetes, multiple sclerosis, celiac disease, scleroderma, hidradenitis suppurativa, vitiligo, dermatomyositis, systemic lupus erythematosus, rheumatoid arthritis, psoriatic arthritis, and inflammatory bowels disease.

4 . The method of claim 3 , wherein the autoimmune disorder is psoriasis.

5 . The method according to any of the preceding claims, wherein said therapeutically effective amount is administered enterally, parenterally, or topically.

6 . (canceled)

7 . (canceled)

8 . The method according to claim 5 , wherein said parenteral administration is administered intravenously or intraarticularly.

9 . The method according to claim 5 , wherein said topical administration is administered as a solution, a cream, an ointment, a gel, a lotion, a suspension, or an emulsion.

10 . The method according claim 2 , wherein said subject is administered a therapeutically effective amount from about 0.5 mg to about 120 mg.

11 . The method according to claim 10 , wherein said therapeutically effective amount is selected from the group consisting of about 0.5 mg, 1 mg, 2 mg, 4 mg, 6 mg, 8 mg, 10 mg, 16 mg, 32 mg, 60 mg, 80 mg, and 120 mg.

12 . The method according to claim 11 , wherein said therapeutically effective amount is about 12 mg.

13 . The method according to claim 11 , wherein said therapeutically effective amount is about 10 mg.

14 . The method according to claim 11 , wherein said therapeutically effective amount is about 8 mg.

15 . The method according to claim 11 , wherein said therapeutically effective amount is about 6 mg.

16 . The method according to claim 11 , wherein said therapeutically effective amount is about 4 mg.

17 . The method according to claim 11 , wherein said therapeutically effective amount is about 1 mg.

18 . The method according to claim 2 , wherein said therapeutically effective amount is administered once daily (QD).

19 . The method according to claim 2 , wherein said therapeutically effective amount is administered twice daily (BID).

20 . The method according to claim 2 , wherein said (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl)oxy)-5-(4-methyl-7H-pyrrolo [2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol or a pharmaceutically acceptable salt thereof is administered for 1 to 28 days.

21 . The method according to claim 2 , wherein said (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl)oxy)-5-(4-methyl-7H-pyrrolo [2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol or a pharmaceutically acceptable salt thereof is administered for 1-6 weeks.

22 . The method according to claim 2 , wherein said (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl)oxy)-5-(4-methyl-7H-pyrrolo [2,3-d]pyrimidin-7-yl)cyclopentane-1,2-diol or a pharmaceutically acceptable salt thereof is administered for 1-6 months.

23 . The method according to claim 22 , wherein said (1S,2S,3S,5R)-3-((6-(difluoromethyl)-5-fluoro-1,2,3,4-tetrahydroisoquinolin-8-yl) oxy)-5-(4-methyl-7H-pyrrolo[2,3-d]pyrimidin-7-yl) cyclopentane-1,2-diol or a pharmaceutically acceptable salt thereof is administered for 1-4 months.