GSTM1 and rheumatoid arthritis: This finding was supported by an analysis of data from RA-BEGIN and RA-BEAM, which showed that lower baseline Hb levels were associated with increased structural damage progression at week 52 (adjusted OR 0.72, p = 0.001 in RA-BEGIN; 0.76, p < 0.001 in RA-BEAM) [39].