In this blog post I will describe what a PARP inhibitor is, and provide all the FDA approval information and a few articles that compare the different types.
Let's start with this definition provided by the NCI.
"A substance that blocks an enzyme in cells called PARP. PARP helps repair DNA when it becomes damaged. DNA damage may be caused by many things, including exposure to UV light, radiation, certain anticancer drugs, or other substances in the environment. In cancer treatment, blocking PARP may help keep cancer cells from repairing their damaged DNA, causing them to die. PARP inhibitors are a type of targeted therapy. Also called poly (ADP-ribose) polymerase inhibitor."
I'm more a visual person so here is a video by Dana Farber that you might find helpful.
Now lets look at each PARP and when , who and why it was approved. The FDA pages include references to the clinical trials that the approval was based on. Remember there are still clinical trials enrolling that may use a PARP in combination with other treatments.
FDA Approval Summary: Olaparib Monotherapy in Patients with Deleterious Germline BRCA-Mutated Advanced Ovarian Cancer Treated with Three or More Lines of Chemotherapy. https://www.ncbi.nlm.nih.gov/pubmed/26187614
On Aug. 17, 2017, the U.S. Food and Drug Administration granted regular approval to olaparib tablets (Lynparza, AstraZeneca) for the maintenance treatment of adult patients with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer, who are in a complete or partial response to platinum-based chemotherapy.
On March 27, 2017 , the U.S. Food and Drug Administration approved niraparib (ZEJULA, Tesaro, Inc.), a poly ADP-ribose polymerase (PARP) inhibitor, for the maintenance treatment of adult patients with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in complete or partial response to platinum-based chemotherapy.
Here is additional information from an article in the AACR Journal
On October 23, 2019,the Food and Drug Administration approved niraparib (ZEJULA, Tesaro, Inc.) for patients with advanced ovarian, fallopian tube, or primary peritoneal cancer treated with three or more prior chemotherapy regimens and whose cancer is associated with homologous recombination deficiency (HRD)-positive status. HRD is defined by either a deleterious or suspected deleterious BRCA mutation, or genomic instability in patients with disease progression greater than six months after response to the last platinum-based chemotherapy.
On April 6, 2018, the Food and Drug Administration approved rucaparib (Rubraca®, Clovis Oncology Inc.), a poly ADP-ribose polymerase (PARP) inhibitor, for the maintenance treatment of recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in a complete or partial response to platinum-based chemotherapy.
This NCI blog post PARP Inhibitors as Show Promis as Initial Treatment for Ovarian Cancer pulls together the use of PARPs for initial treatment.
While this 30 minute webinar is geared toward medical professionals, it provides an overview of all three PARP inhibitors and their use.
If you have other resources you would like to share on PARP inhibitors please leave a link the the comment section and I will update this page.
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