Table II.

Survival after hepatic homotransplantation to recipient dogs treated with azathioprine

Group	No. dogs	Survival			Mean survival of dogs living 7 days or more (50 day limit)*		S.D. (50 day limit)
		7 days or more	25 days or more	50 days or more
1†	17	11	8	4	33.4	72.3	16.4
2†	16	11	7	5	31.7	68.8	19.3
3†	13	11	7	3	29.5	63.1	15.0
4†	16	11	4	2	24.2	39.1	14.5
5	12	7	2	1	19.7	28.6	15.6
6	12	11	5	3	26.5	32.2	18.5
7	17	11	7	3	28.9	37.1	15.6
8	13	11	4	3	26.1	30.8	18.1
	116	84	44	24	27.9	47.3	16.5

^*The dogs surviving longer than 50 days are described individually in Table V, the greatest longevity now being 324 days. Statistical evaluation of different regimens take into account only the first 50 days. This avoids introduction of unfair bias in the event of unusually protracted survival, and allows comparison of different series of animals undergoing operation in the chronology shown. In all of the groups, the actual mean survival without the artificial 50 day limit has been brought up to date to Feb. 10, 1965, and is just to the right of the artifactually low values.

^†In at least one dog from each group, all therapy, including azathioprine, was discontinued after 120 days.