6. The effects of 90Y-DOTA-tyr3-Octreotide on the developing human fetus are unknown. Retinoic acid is known to be harmful to the developing human fetus. For these reasons and because Class C agents are known to be teratogenic, women and men of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.