On December 14, 2016 Cellectar Biosciences, Inc. (Nasdaq: CLRB) (the "company"), an oncology-focused clinical stage biotechnology company, reported that the United States Patent and Trademark Office ("USPTO") has issued patent allowances covering method of use for radiotherapy with the company’s lead compound, CLR 131, as well as CLR 125, another of the company’s pipeline products using its proprietary phospholipid drug conjugate ("PDC") to deliver a radio therapeutic (Filing, 8-K, Cellectar Biosciences, DEC 14, 2016, View Source [SID1234517072]).
The allowance covers radiotherapy applications for a broad range of solid tumors, specifically: lung, adrenal, intestinal, colon, colorectal, ovarian, cervical, prostate, liver, breast, subcutaneous and pancreatic cancers, as well as melanoma, retinoblastoma, glioma, carcinosarcoma, squamous cell carcinoma and hepatocellular carcinoma. These claims are a continuation of US Patent No. 8,877,159, which provides patent protection into 2025.
"This patent allowance further expands the intellectual property protection of our lead radiotherapeutic candidate beyond the hematologic cancers we are currently researching," said Jim Caruso, president and CEO of Cellectar. "The expanded patent estate provides us and any potential partners with the option to advance CLR 131 clinical development into a wide variety of solid tumor applications."
About CLR 131
CLR 131 is an investigational compound under development for a range of hematologic malignancies. It is currently being evaluated in a Phase I clinical trial in patients with relapsed or refractory multiple myeloma. The company plans to initiate a Phase II clinical study to assess efficacy in a range of B-cell malignancies in the first quarter of 2017. Based upon pre-clinical and interim Phase I study data, treatment with CLR 131 provides a novel approach to treating hematological diseases and may provide patients with therapeutic benefits, including overall response rate (ORR), an improvement in progression-free survival (PFS) and overall quality of life. CLR 131 utilizes the company’s patented PDC tumor targeting delivery platform to deliver a cytotoxic radioisotope, iodine-131 directly to tumor cells. The FDA has granted Cellectar an orphan drug designation for CLR 131 in the treatment of multiple myeloma.
About Phospholipid Drug Conjugates (PDCs)
Cellectar’s product candidates are built upon its patented cancer cell-targeting delivery and retention platform of optimized phospholipid ether-drug conjugates (PDCs). The company deliberately designed its phospholipid ether (PLE) carrier platform to be coupled with a variety of payloads to facilitate both therapeutic and diagnostic applications. The basis for selective tumor targeting of our PDC compounds lies in the differences between the plasma membranes of cancer cells compared to those of normal cells. Cancer cell membranes are highly enriched in lipid rafts, which are glycolipoprotein microdomains of the plasma membrane of cells that contain high concentrations of cholesterol and sphingolipids, and serve to organize cell surface and intracellular signaling molecules. PDCs have been tested in over 70 different xenograft models of cancer.
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