Tag Archives: Keytruda

PD-L1 Expression correlates with outcomes in patients with melanoma

Keytruda (pembrolizumab) and Opdivo (nivolumab) are monoclonal antibodies that disrupt the PD-1 (Opdivo) / PD-L1 (Keytruda) pathway; they are approved by the FDA for the treatment of patients with unresectable melanoma, as well as other cancers including non-small cell lung cancer (NSCLC), head and neck cancer, renal cell carcinoma (Opdivo), and Hodg  kin lymphoma (Opdivo). Keytruda is limited to patients with NSCLC with a tumor proportion score (TPS) of greater than 50% for PD-L1 staining. Continue reading →

How PD-1 abrogates the anti-tumor immune response

PD-1 inhibition (Figure 1) has quickly become a front-line therapy for non-small cell lung cancer and melanoma. Moreover, PD-1 and PD-L1 inhibitors are being tested in combination with other checkpoint inhibitors, targeted therapies, cancer vaccines, monoclonal antibodies, and other modalities. But, how does PD-1 blunt the anti-tumor immune response? Continue reading →

Mechanisms of Melanoma Resistance to PD-1 Checkpoint Inhibition

It is estimated that about 40 percent of patients with advanced melanoma, the deadliest form of skin cancer, will initially respond to an immunotherapy, but about a quarter of those 40 percent will relapse within three years of treatment. In order to identify the mechanisms by which resistance to PD-1 inhibition is mediated, UCLA researchers studied biopsies of melanoma tumors taken before and after treatment with Keytruda (pembrolizumab) in patients whose cancer had returned. Continue reading →

Neo-antigens for Cancer Immunotherapy

Two new companies have received substantial funding to pursue neo-antigens for cancer immunotherapy: Gritstone Oncology raised $102MM to pursue lung cancer and Neon Therapeutics raised $55MM to develop neoantigen-based therapeutic vaccines and T cell therapies to treat cancer. Continue reading →

DNAtrix and Merck Phase II Collaboration of Oncolytic Virus + Keytruda for Glioblastoma

DNAtrix and Merck announced a collaboration to combine oncolytic virus therapy and PD-1 inhibition – the two companies will collaborate in phase II clinical trials on a therapy to treat glioblastoma, an especially deadly cancer for which there is no cure. Continue reading →