In connection with announcing the executive transitions described in Item 5.02 above, the Company provided the following update regarding certain of its development programs:
P-PSMA-101 Autologous CAR-T for Prostate Cancer
A Phase 1 trial evaluating P-PSMA-101, the Company’s autologous CAR-T candidate for the treatment of metastatic castrate resistant prostate cancer (mCRPC) is ongoing. Initial clinical data was presented in late August 2021 at the CAR-TCR Summit demonstrating encouraging early results at low doses in this difficult to treat patient population with high unmet need. The Company will be presenting additional data during the ASCO Genitourinary Cancers Symposium taking place February 17-19, 2022, in a poster titled, “Phase 1 study of P-PSMA-101 CAR-T cells in patients with metastatic castration-resistant prostate cancer (mCRPC).”
P-BCMA-ALLO1 Allogeneic CAR-T for R/R Multiple Myeloma
The Phase 1 trial of P-BCMA-ALLO1, an allogeneic CAR-T product candidate for the treatment of relapsed refractory multiple myeloma, is currently initiating with a clinical data update expected later in the year. In addition to the continued product manufacturing at the current contract manufacturing organization, the Company is exploring a parallel path to enable manufacturing of P-BCMA-ALLO1 at its in-house GMP manufacturing pilot plant in San Diego, following successful manufacturing runs of the allogeneic CAR-T product candidate P-MUC1C-ALLO1.
P-MUC1C-ALLO1 Allogeneic CAR-T for Solid Tumors
The Company announced on December 20, 2021 that the IND submitted for the P-MUC1C-ALLO1 product candidate had been cleared by the FDA. The Phase 1 clinical trial start-up is underway and will evaluate P-MUC1C-ALLO1 in various solid tumors, including breast, ovarian, lung and colorectal cancers. P-MUC1C-ALLO1 is manufactured at the Company’s in-house GMP manufacturing pilot plant in San Diego. Initial clinical data from P-MUC1C-ALLO1 is expected to be presented at a scientific meeting this year.
Dual P-CD19CD20-ALLO1 Allogeneic Car T for B-cell Malignancies
Due to the prioritization of the lead allogeneic programs and the focus on achieving associated milestones in 2022, the Company is shifting expectations for an IND filing of its first dual CAR-T program from the end of 2022 into 2023.
P-OTC-101 In Vivo Liver Directed Gene Therapy for OTC
The Company’s leading internal gene therapy program, P-OTC-101, an in vivo liver-directed gene therapy for ornithine transcarbamylase (OTC) deficiency, continues with IND enabling activities and evaluation of both a fully nanoparticle delivery approach as well as a hybrid nanoparticle/AAV approach. A decision of whether to pursue the fully nanoparticle or hybrid approach going forward is expected by mid-year.