Table 1. WHO classification-based... | American Society of Hematology

Table 1.

WHO classification-based Prognostic Scoring System (WPSS) of primary myelodysplastic syndromes.⁵²

Variable	0	1	2	3
* Good: normal, -Y, del(5q), del(20q); Poor: complex, chromosome 7 anomalies; Intermediate: other abnormalities
** Transfusion dependency: at least one transfusion every 8 weeks over a period of 4 months
Risk groups: very low (score 0), low (score 1), intermediate (score 2), high (score 3–4), very high (score 5–6).
WHO Category	RA, RARS, 5q-	RCMD, RCMD-RS	RAEB-1	RAEB-2
Karyotype*	Good	Intermediate	Poor	—
Transfusion requirement**	No	Regular	—	—

Variable	0	1	2	3
* Good: normal, -Y, del(5q), del(20q); Poor: complex, chromosome 7 anomalies; Intermediate: other abnormalities
** Transfusion dependency: at least one transfusion every 8 weeks over a period of 4 months
Risk groups: very low (score 0), low (score 1), intermediate (score 2), high (score 3–4), very high (score 5–6).
WHO Category	RA, RARS, 5q-	RCMD, RCMD-RS	RAEB-1	RAEB-2
Karyotype*	Good	Intermediate	Poor	—
Transfusion requirement**	No	Regular	—	—