Table 1.

Demographic and baseline characteristics

CharacteristicN = 20 (%)
Median age (range), y 62 (41-76) 
Sex  
Male 12 (60) 
Female 8 (40) 
Race  
White 18 (90) 
Black 2 (10) 
T-LGLL–associated hematocytopenia (or indication for treatment)  
Neutropenia 10 (50) 
Transfusion-dependent anemia 4 (20) 
Symptomatic anemia 2 (10) 
Both 4 (20) 
STAT3 mutation   
No 13 (65) 
Yes 7 (35) 
D661Y 1 (5) 
D661V 1 (5) 
Y640F 3 (15) 
N641I 2 (10) 
Concomitant autoimmune disease  
Rheumatoid arthritis 1 (5) 
Other  2 (10) 
None 17 (85) 
Prior therapy (median, 2; range, 1-6)  
Methotrexate 12 (60) 
Cyclophosphamide 7 (35) 
Cyclosporine 7 (35) 
Alemtuzumab 2 (10) 
Pentostatin 1 (5) 
Tofacitinib 1 (5) 
No prior therapy 7 (35) 
CharacteristicN = 20 (%)
Median age (range), y 62 (41-76) 
Sex  
Male 12 (60) 
Female 8 (40) 
Race  
White 18 (90) 
Black 2 (10) 
T-LGLL–associated hematocytopenia (or indication for treatment)  
Neutropenia 10 (50) 
Transfusion-dependent anemia 4 (20) 
Symptomatic anemia 2 (10) 
Both 4 (20) 
STAT3 mutation   
No 13 (65) 
Yes 7 (35) 
D661Y 1 (5) 
D661V 1 (5) 
Y640F 3 (15) 
N641I 2 (10) 
Concomitant autoimmune disease  
Rheumatoid arthritis 1 (5) 
Other  2 (10) 
None 17 (85) 
Prior therapy (median, 2; range, 1-6)  
Methotrexate 12 (60) 
Cyclophosphamide 7 (35) 
Cyclosporine 7 (35) 
Alemtuzumab 2 (10) 
Pentostatin 1 (5) 
Tofacitinib 1 (5) 
No prior therapy 7 (35) 

No patients had STAT5b mutations.

One patient each with eosinophilic fasciitis and ulcerative colitis, respectively.

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