Table 1. Radiosensitivity of hematopoietic myeloid progenitor cells.

		CFU-GM	BFU-E	CFU-Mix	Total CFC
X-rays	D0	1.15±0.05a,b	0.83±0.04c	0.71±0.06d	1.07±0.09
	n	1.46±0.20	7.72±1.00e,f,g	1.88±0.58	1.85±0.33
Carbon-ion beams	D0	0.57±0.02h	0.73±0.03i	0.64±0.05	0.65±0.03j
	n	1.37±0.28	1.00±0.26k	1.00±0.16	1.10±0.11l
RBE10%		2.07	2.12	1.31	1.94

Values are the mean±SE. of 6–8 separate experiments. P values were calculated using two-factor factorial ANOVA and Tukey–Kramer test. A significant difference was observed between D₀ and n for radiation types (D₀: P = 1.40×10⁻⁹, n: P = 1.16×10⁻⁷) and for each progenitor (D₀: P = 1.75×10⁻³, n: P = 4.53×10⁻⁸). ^aP = 4.97×10⁻² vs. BFU-E, ^bP = 1.33×10⁻⁴ vs. CFU-Mix, ^cP = 6.55×10⁻³ vs. CFU-Mix, ^dP = 9.49×10⁻⁴ vs. CFC, ^eP = 2.87×10⁻³ vs. CFU-GM, ^fP = 4.01×10⁻² vs. CFU-Mix, ^gP = 4.64×10⁻³ vs. CFC in X-rays. ^hP = 3.79×10⁻⁶, ⁱP = 0.00196, ^jP = 6.51×10⁻⁵, ^kP = 2.34×10⁻³, ^lP = 2.50×10⁻² compared with X-rays.