Table 1 Comparison of disease... | American Society of Hematology

Table 1

Comparison of disease complications during follow-up in initial fibrotic versus non-fibrotic PV patients

Events	Number of events (%)	Incidence per 100 patient-years	IRR	P	5-year cumulative incidence, %	10-year cumulative incidence, %	15-year cumulative incidence, %
Thrombosis
No BM fibrosis	75 (17)	2.7	0.4	.03	14.6	20.3	32.0
BM fibrosis ≥ 1	5 (7)	1.1			1.8	14.1	20.3
Progression to overt myelofibrosis
No BM fibrosis	25 (6)	0.8	2.7	.01	1.3	6.9	15.4
BM fibrosis ≥ 1	10 (14)	2.2			7.8	22.0	29.1
Leukemic transformation
No BM fibrosis	9 (2)	0.3	0	.274	0	2.1	6.1
BM fibrosis ≥ 1	0 (0)	0			0	0	0
Death
No BM fibrosis	44 (10)	1.39	0.7	.545	2.3	11.3	21.8
BM fibrosis ≥ 1	5 (7)	1.02			5.3	5.3	12.6

Events	Number of events (%)	Incidence per 100 patient-years	IRR	P	5-year cumulative incidence, %	10-year cumulative incidence, %	15-year cumulative incidence, %
Thrombosis
No BM fibrosis	75 (17)	2.7	0.4	.03	14.6	20.3	32.0
BM fibrosis ≥ 1	5 (7)	1.1			1.8	14.1	20.3
Progression to overt myelofibrosis
No BM fibrosis	25 (6)	0.8	2.7	.01	1.3	6.9	15.4
BM fibrosis ≥ 1	10 (14)	2.2			7.8	22.0	29.1
Leukemic transformation
No BM fibrosis	9 (2)	0.3	0	.274	0	2.1	6.1
BM fibrosis ≥ 1	0 (0)	0			0	0	0
Death
No BM fibrosis	44 (10)	1.39	0.7	.545	2.3	11.3	21.8
BM fibrosis ≥ 1	5 (7)	1.02			5.3	5.3	12.6