Table 1. Frequency of DNA breakage at RET intron 11, FRA3B, and non-fragile 12p12.3 as detected by LM-PCR.

	DNA Breaks/100 ng DNA/Locus (±SD)
Treatment	RET	FRA3B	12p12.3
Untreated	0.90 ± 0.50	3.75 ± 0.93	0.13 ± 0.26
0.4 µM APH	4.08 ± 1.50	18.40 ± 2.04	0.13 ± 0.26
0.4 µM APH + 6 nM BA	1.25 ± 0.58	3.75 ± 1.74	-
0.4 µM APH + 3 µM Merbarone	0.97 ± 0.38	5.00 ± 2.80	-
0.4 µM APH + 150 nM CPT11	23.06 ± 3.75	36.98 ± 9.56	1.17 ± 0.50