Subjects who completed at least 2 years of follow-up in BEX104728 were enrolled in LTFU Study BEX104526 for continued radiographic response evaluations and safety evaluations every 6 months for years 3 through 5 post-treatment and annually for years 6 through 10 post-treatment. Subjects in BEX104526 were assessed for survival and disease status, including subsequent therapy for NHL, and for long-term safety, including the development of hypothyroidism, myelodysplastic syndrome (MDS), acute myelogenous leukemia (AML), and any other secondary malignancies. Additionally, subjects were followed for the development of any adverse event(s) (AEs) deemed by the Principal Investigator as being possibly or probably related to a subject's treatment with TST/I-131 TST. Laboratory evaluations, consisting of thyroid stimulating hormone (TSH) level and complete blood cell count with a differential and platelet count, were obtained annually through year 10 post-treatment.