Positive 12‑Month CLOVER WaM Phase IIb Results
iopofosine I-131 met both primary and secondary endpoints in the 12‑month follow-up of the Phase IIb CLOVER WaM study (N=55). Key metrics: overall response rate (ORR) 83.6%, major response rate (MRR) 61.8%, median duration of response (DOR) 17.8 months, median progression-free survival (PFS) 13.5 months, VGPR/CR rate 14.5%, and disease control rate 98.2%. More than 30% of responders maintained responses beyond 36 months. Efficacy was consistent in both BTKi‑exposed and BTKi‑refractory subgroups.
Regulatory Pathway and Development Plans
Company plans to advance iopofosine toward an accelerated approval submission and initiate a randomized Phase III confirmatory trial evaluating PFS as the primary endpoint. Anticipated initiation of the Phase III study in late Q4 2026. Cellectar has Breakthrough Therapy designation from the FDA (received prior May), which the company expects could support an expedited review timeline and potential regulatory action in H2 2027 if milestones are met.
Oversubscribed Financing to Support Late‑Stage Development
Completed an oversubscribed financing structure providing up to $140 million (upfront $35 million plus up to $105 million in milestone‑based warrants). Company states this materially strengthens the balance sheet and provides resources to advance iopofosine through Phase III and potential commercialization, and to support the CLR125 TNBC program.
Advancement of CLR125 in Triple‑Negative Breast Cancer (TNBC)
Dosed first patients in the Phase Ib open‑label dose‑finding trial of CLR125 (alpha‑emitting radio conjugate) in relapsed/refractory TNBC. Trial will evaluate 3 dose levels, enroll ~15 patients per arm with an expansion cohort, and includes dosimetry and preliminary efficacy endpoints (RECIST, PFS). Company expects to report biodistribution, dosimetry and early efficacy data during the year.
Cost Discipline and Reduced Operating Expenses
R&D expenses for Q1 2026 were approximately $3.0M vs $3.4M in Q1 2025 (a decline of ~11.8%), driven by reduced follow‑up activities and lower preclinical spend (partially offset by increased manufacturing). G&A decreased to $2.8M vs $3.0M in prior year (~‑6.7%). Net loss narrowed to $5.7M ($1.33/share) from $6.6M ($4.30/share) in Q1 2025 (net loss reduction of ~13.6%; per‑share loss declined ~69.1%).
Scientific Recognition and Investor Visibility
Post‑BTKi subgroup analysis from CLOVER WaM was selected for presentation at ASCO, increasing scientific visibility. Management emphasized the potential for iopofosine to be a differentiated option in the post‑BTKi setting and possibly move earlier into the WM treatment paradigm.