ROR1 and neoplasm: Longer follow-up showed that despite only 7 d of ROR1-BiTE therapy and a single infusion of T cells, the ROR1 BiTE-treated cohort maintained lower tumor volumes compared with the control mice (Day 28:mean size 171.2 mm3 vs. 361.2 mm3, p = 0.037), suggesting transient treatment with ROR1 BiTE can lead to a durable antitumor responses (Fig. 4B).