Yttrium-90 (90Y) ibritumomab tiuxetan (Zevalin) induces long-term durable responses in patients with relapsed or refractory B-Cell non-Hodgkin's lymphoma.
OBJECTIVE
Yttrium-90 ((90)Y) ibritumomab tiuxetan (Zevalin) radioimmunotherapy is an effective treatment for relapsed or refractory B-cell non-Hodgkin's lymphoma (NHL), with overall response rates ranging from 74% to 82%. This retrospective analysis was conducted to determine the number of patients achieving long-term durable responses with (90)Y ibritumomab tiuxetan treatment.


METHODS
The medical records of patients (n = 211) with relapsed, refractory, or transformed indolent CD20+ B-cell NHL who were treated with 90Y ibritumomab tiuxetan were reviewed. Time to progression (TTP) of > or =12 months was noted in 78 patients (37%), who were identified as long-term responders and were further characterized.


RESULTS
Median age of the long-term responders was 58 years (range, 24-80 years) with 44% over 60 years, and 55% were male. Notably, 59% of patients had received > or =2 prior regimens, 33% had received > or =3 prior regimens, and 37% had failed to respond to immediate prior therapy. Median response duration was 28.1 months (range, 10.5-80.3+ months). Median TTP was 29.3 months (range, 12.1-81.5+ months). In patients with ongoing response, median TTP was 53.9 months (range, 49-82+ months).


CONCLUSIONS
(90)Y ibritumomab tiuxetan produces durable long-term responses in patients with relapsed/refractory B-cell NHL. Failure to respond to prior therapy does not preclude achieving a long-term response with 90Y ibritumomab tiuxetan.
Wiseman
Gregory A
GA
Mayo Clinic, Rochester, MN, USA. gwiseman@mayo.edu
Witzig
Thomas E
TE
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D018951:Antigens, CD20 / Q000096:biosynthesis; D018450:Disease Progression; D005260:Female; D006801:Humans; D016393:Lymphoma, B-Cell / Q000473:pathology*; D008228:Lymphoma, Non-Hodgkin / Q000188:drug therapy* / Q000473:pathology* / Q000532:radiotherapy*; D008297:Male; D008875:Middle Aged; D016499:Radioimmunotherapy / Q000379:methods; D012008:Recurrence; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome; D015021:Yttrium Radioisotopes / Q000494:pharmacology*
D000911:Antibodies, Monoclonal; D018951:Antigens, CD20; D015021:Yttrium Radioisotopes; C422802:ibritumomab tiuxetan