9. Concomitant Therapy - The subject may not receive any other approved or investigational anti-neoplastic therapies for the treatment of the refractory somatostatin-receptor positive tumor during the course of the study, excluding somatostatin analogues and bisphosphonates. However, all subjects on somatostatin analogue therapy will discontinue therapy from 12 hours prior to a) injection with OctreoScan® or 111In-DOTA-tyr3-Octreotide, and b) infusion with 90Y-DOTA-tyr3-Octreotide until 12 hours post administration. Subjects who have been on hormonal therapy (other than somatostatin analogues) for > 2 months with SD or PD may continue to receive hormonal therapy during this study. Subjects who initiate another tumor-specific therapy will be discontinued from further treatment with 90YDOTA-tyr3-Octreotide. Disease progression alone does not mandate discontinuation of a subject from treatment.