On August 17, 2020 Cellectar Biosciences, Inc. (NASDAQ: CLRB), a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of drugs for the treatment of cancer, reported that Jarrod Longcor, chief business officer of Cellectar, presented a poster at the American Association of Cancer Research (AACR) (Free AACR Whitepaper) VIRTUAL MEETING: ADVANCES IN MALIGNANT LYMPHOMA being held August 17-19, 2020 (Press release, Cellectar Biosciences, AUG 17, 2020, View Source [SID1234563740]). The abstract was submitted April 2, 2020.

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The poster, entitled: "CLR 131 Demonstrates 100% Overall Response Rate in Relapsed or Refractory Lymphoplasmacytic Lymphoma (LPL)/Waldenstrom’s Macroglobulinemia (WM): Initial Results from Ongoing Phase 2 trial, CLOVER-1 Study" reviews data from four patients enrolled in the Phase 2a portion of the ongoing Phase 2 CLOVER-1 study of CLR 131. The presentation featured efficacy and safety data highlighting;

-100% overall response rate,
-25% complete response rate,
-75% major response rate (patients achieving partial response or better), and
-Mean duration of response exceeding 17 months (8.4 – 31.7 months); duration of response continues to increase for all patients

The safety profile in these highly pretreated patients with relapsed or refractory LPL/ WM was predictable and adverse events were similar to those observed in previous CLR 131 clinical studies in B-cell malignancies. The predominate treatment emergent adverse event remains cytopenias with all patients recovering. Importantly, no patients experienced adverse events that are frequently associated with treatments prescribed for LPL/WM patients such as atrial fibrillation, peripheral neuropathy, ocular toxicities, bleeding events, liver toxicities, renal toxicities or other "off-target" effects.

"CLR 131’s ability to treat various LPL/WM patients including those who do not respond to or are intolerant of ibrutinib is a potentially important therapeutic advance. The potential for patients to have a long term drug treatment holiday whereby there is no requirement for taking a pill once or twice a day for years is clinically meaningful," said study investigator Sikander Ailawadhi, M.D., Division of Hematology/Oncology, Department of Internal Medicine, Mayo Clinic, Jacksonville, Florida.

"The overall product profile and achievement of a complete response as a monotherapy, along with the extended duration of responses in patients that are refractory to at least one prior therapy and have also received multiple lines of treatment is highly encouraging," said Jarrod Longcor. "These patients currently have limited treatment options and CLR 131 may represent an important potentially disease modifying improvement in the LPL/WM treatment paradigm. We plan to initiate our pivotal study and potentially report additional LPL/WM data later this year."

There is currently only one approved drug for the treatment of relapsed or refractory LPL/WM. In May of this year, the U.S. Food and Drug Administration granted Fast Track Designation for CLR 131 in treatment of relapsed or refractory LPL/WM. The company currently continues to enroll patients in the Phase 2b portion of the CLOVER-1 study and plans to initiate a pivotal study in LPL/WM in the fourth quarter of 2020.

About CLOVER 1

The Phase 2 CLOVER-1 study is an open-label study designed to determine the efficacy and safety of CLR 131 in select B-cell malignancies. The CLOVER-1 Phase 2 study completed the Part A dose-exploration portion, conducted in relapsed/refractory (r/r) B-cell malignancies, and is now enrolling in the Part B expansion cohorts evaluating a two cycle dosing regimen that provides approximately 100mCi total body dose of CLR 131 in r/r multiple myeloma (MM) and lymphoplasmacytic lymphoma/Waldenstrom’s macroglobulinemia (LPL/WM). Patients with LPL/WM must have received at least two prior treatment regimens, unless ineligible to receive standard agents, and have measurable disease, as defined by either a nodal lesion of > 15 mm, an extranodal lesion of > 10 mm, or measurable IgM. Prior external beam radiation therapy was allowed. The median age of the four LPL/WM patients enrolled in the study was 70 (range 54-81) and included 2 females and 2 males who had a median of two prior regimens (range 1-5). CLR 131 was administered intravenously, up to 30 minutes at total body doses (TBD) of <50mCi, ~50 mCi, and ~75mCi.

A copy of the presentation materials can be accessed on the Events and Presentations section of the Cellectar website once the presentations conclude.

About CLR 131

CLR 131 is a small-molecule Phospholipid Drug Conjugate designed to provide targeted delivery of iodine-131 (radioisotope) directly to cancer cells, while limiting exposure to healthy cells unlike many traditional on-market treatment options. CLR 131 is the company’s lead product candidate and is currently being evaluated in a Phase 2 study in B-cell lymphomas, and a Phase 1 dose-escalating clinical study in pediatric solid tumors and lymphomas. The company recently completed a Phase 1 dose-escalation clinical study in r/r multiple myeloma. The FDA granted CLR 131 Fast Track Designation for both r/r multiple myeloma and r/r diffuse large B-cell lymphoma and Orphan Drug Designation (ODD) for the treatment of multiple myeloma, lymphoplasmacytic lymphoma/Waldenstrom’s macroglobulinemia, neuroblastoma, rhabdomyosarcoma, Ewing’s sarcoma and osteosarcoma. CLR 131 was also granted Rare Pediatric Disease Designations for the treatment of neuroblastoma, rhabdomyosarcoma, Ewing’s sarcoma and osteosarcoma. Earlier this year, the European Commission granted an ODD for r/r multiple myeloma and most recently, the U.S. Food and Drug Administration granted Fast Track Designation for CLR 131 in lymphoplasmacytic lymphoma (LPL)/Waldenstrom’s macroglobulinemia (WM) in patients having received two prior treatment regimens or more.