Table 3.

Median Cumulative MIBG Activity and Red Marrow Index in 20 Assessable Patients^*

Dose Level	No. of Patients	Red Marrow Index (Gy)		MIBG (mCi/kg)
		Median	Range	Median	Range
1	3	452	320 to 505	23	22 to 24
2	7	534	377 to 592	31	24 to 35
3	3	577	572 to 657	49	41 to 51
4†	7	642	487 to 892	41	32 to 44

Abbreviation: MIBG, metaiodobenzylguanidine.

^*One of 21 patients at level 4 only received one infusion due to a technical problem and was excluded from this analysis.

^†A second dose at level 4 was capped at 21 mCi/kg.