The present disclosure provides methods, compositions, kits, and systems useful in the determination and evaluation of the immune repertoire. In one aspect, methods provide for determining convergence of T cell receptor and/or B cell receptor repertoires in samples prior to a treatment and predicting a subject's response to the treatment based on the measured convergence frequency. In another aspect, methods provide for an immune receptor haplotype group and predicting a subject's potential or predisposition to be protected from or vulnerable to an adverse event following a treatment.