Celldex Therapeutics (CLDX) Announces Positive Results From Phase Studies of CDX-1307

October 29, 2009 10:11 AM EDT

Celldex Therapeutics, Inc. (NASDAQ: CLDX) announced positive results from Phase 1 studies of CDX-1307 in patients with advanced epithelial cancers, including breast, colon, bladder and pancreatic cancer. CDX-1307.

The Phase 1 studies investigated the safety and immunogenicity of CDX-1307 alone and in combination with adjuvants, including GM-CSF and Toll-like Receptor (TLR) agonists (poly-ICLC or Hiltonol™ and R848 or resiquimod). The studies enrolled more than 80 patients with heavily pretreated, advanced-stage breast, colon, bladder and pancreatic cancer, with an average of 4.6 prior therapies across the treatment population. All patient cohorts demonstrated a favorable safety profile with no dose limiting toxicity to date. The combination of CDX-1307 with TLR agonists significantly enhanced immune responses against hCG-β, providing strong humoral responses in 88% of patients and cellular immune responses in 57% of patients analyzed to date. Immune responses occurred even in the presence of high circulating levels of hCG-β, suggesting that the CDX-1307 can overcome antigen tolerance in advanced and heavily pretreated cancers. Nine patients in the studies experienced disease stabilization from 2.3 months to 11.4 months following the initiation of CDX-1307 vaccination. Two of these patients have received multiple courses of CDX-1307 and continue treatment with stable disease at 6.4 and 11.4 months. These data provide the basis for advancing CDX-1307 into a front-line patient population selected for hCG-β expressing cancers. Celldex is planning the initiation of a Phase 2 study in patients with newly diagnosed bladder cancer in the first quarter of 2010.

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