approached significanceP =0.0552
The association between +12 and atypical immunophenotype (moderate to strong expression of at least two markers including CD22, CD79b, strong surface immunoglobulin, and FMC7) approached significance (χ 2 test, P =0.0552). 4 , 15 Trisomy 12 cases were more likely to demonstrate unmutated IGHV genes ( P =0.0004) and express CD38 ( P =0.044) than del(13q) cases, with statistical significance.