Michael H. Tardugno
Analyst · H.C. Wainwright
Thank you, Khursheed. So if the interim data are confirmed, the observed PFS benefit would represent a clinically meaningful outcome. At September, we reported PFS and OS data suggesting an approximate 30% delay in disease progression and death among patients in the treatment arm compared with patients in the control arm.
The hazard ratio, in fact, nears the study objective. Preliminary OS data followed a similar trend, showing an approximate 9-month improvement in the treatment arm over the control arm. Subgroup analysis suggest patients treated with a PARP inhibitor as a maintenance therapy, had longer PFS and OS if they were treated with IMNN-001 versus patients treated with neoadjuvant chemotherapy only.
We note that when the OVATION 2 study began PARP inhibitors had not yet been approved for first-line maintenance treatment for a study population. Since then, for patients with certain genetic characteristics, PARP inhibitor forms an important part of the patient treatment plan.
For a subgroup, let me say this is a non-prespecified subgroup. For subgroup analysis of patients who received PARP inhibitor maintenance therapy, trends suggest that even a larger clinical benefit exists or has the potential. In this subgroup, the median PFS in the control arm was 15.7 months versus 23.7 months in the treatment arm or 8 months longer. In addition, the median OS in the control arm was 45.6 months and yet had not been reached in the treatment arm. Although this data are post-hoc and again, non-prespecified, it represents a small number of patients; they are intriguing nonetheless and encouraging, I would suggest.
But we have a second study. It's not been talked about much, but it is starting to get quite a bit of -- attract quite a bit of interest from the medical community. It's a second study of 001 in advanced ovarian cancer. It is ongoing, principally funded by the Breakthrough Cancer Foundation. And although the funding is from Breakthrough Cancer Foundation, the data belongs to the company, belongs to the Imunon. I want to reassure you of that.
While MD Anderson Cancer Center at the University of Texas is the lead clinical site, the trial is expected to enroll 50 patients with Stage III/IV ovarian cancer. Patients treated for frontline neoadjuvant therapy will be randomized 1:1 and will receive standard chemotherapy plus Avastin, that is the differentiator. So the treatment arm will be standard chemotherapy plus Avastin or the -- I'm sorry, the control arm, standard chemotherapy plus Avastin. On the treatment arm, it is standard chemotherapy plus Avastin plus IMNN-001.
So I'm happy to report that the acceptance of our abstract for this trial, describing the study designed for presentation at a poster at the ASCO conference this year at its annual meeting in Chicago during the week of May 31 through June 4. I suggest again that this reflects the medical community's interest in our study and its potential for a new therapeutic option for women with advanced ovarian cancer.
Also, I just want to point out the trial's primary endpoint is the detection of minimum residual disease, the acronym is MRD, Minimal Residual Disease by second look laparoscopy. This is a novel endpoint that will be assessed following adjuvant treatment, approximately 3 months following adjuvant treatment. The secondary endpoint is PFS. The trial will also provide a wealth of translational endpoints aimed at understanding the clonal evolution in immunogenomic features of the MRD phase of ovarian cancer that is currently undetectable by imaging or tumor markers.
In February 2024, Memorial Sloan Kettering, it's MSK, Cancer Center joined MD Anderson enrolling patients in this trial. We expect two more sites to be up and running in the near future. We'll keep you posted as sites are added and this trial progresses.
Assuming success in either or both of these studies, we believe 001, that is IMNN-001 will be the first immunotherapy as Stacy pointed out, that's proven effective for the treatment of advanced ovarian cancer and will demonstrate our TheraPlas platform. This is key which demonstrate the platform may have a place in medicine to treat a range of intraperitoneal cancers.
So now I'll turn my focus to the infectious disease program. Last month, we announced acceptance by the FDA. Just last month, acceptance by the FDA of our Phase I protocol for seasonal COVID-19 booster. As we announced this morning, if you read our press release, enrollment has begun already, initiated our clinical trial center in Philadelphia, second center, Beth Israel in Boston should be up and running very soon.
This first phase of this study is a 24-subject proof-of-concept trial. The primary objective in this study -- in this study of healthy adults are to evaluate the vaccine candidate safety and tolerability. Secondary objective is hard to evaluate, neutralizing antibody response, cellular response and their durability, which we expect to be among the key advantages of our DNA-based formula. Based on preclinical data, durability is expected to be substantially superior to published mRNA vaccine data. So this trial is a little bit complex, and I'm not sure I covered it properly.
Sebastien, could you just strip the study in a little bit more detail for us?