Table 1.

SWOG and MRC risk stratification.⁶–⁸

Risk status	SWOG coding	MRC coding
Favorable	inv(16)/t(16;16)/del(16q), t(15;17) irrespective of additional cytogenetic abnormalities; t(8;21) lacking del(9q) or complex karyotypes	t(15;17), inv(16)/t(16;16), t(8;21); irrespective of additional cytogenetic abnormalities
Intermediate	Normal, +8, +6, −Y, del(12p)	Entities not classified as favorable or adverse
Unfavorable	abn(3q) del(5q)/−5 −7/del(7q) abn(9q) abn(11q) abn(20q) abn(17p) t(6;9) t(9;22) complex (≥3 unrelated abnormalities)	In the abscence of favorable risk cytogenetics: abn(3q) [excluding t(3;5)], inv(3)/t(3;3) add(5q), del(5q), −5 −7, add(7q)/del(7q) t(6;11) t(10;11) t(11q23) [excluding t(9;11) and t(11;19)] t(9;22) −17/abn(17p) complex (≥4 unrelated abnormalities)
Unknown	All other abnormalities	Category not recognized