Table 3.

Frequency of subjects and number of recurrences in the two hospital groups

Treatment received	Hospital groupa	Total N	N of events (# of recurrences)	Recurrences in [%]
KLH	Group 1	95	70	74
	Group 2	172	93	54
	Overall	267	163	61
Mitomycin C	Group 1	90	23	26
	Group 2	166	64	39
	Overall	256	87	34

^aGroup 1 = 6 hospitals, Group 2 = 12 hospitals

KLH Keyhole Limpet Hemocyanin