Netscientific Regulatory News (NSCI)

For immediate release

NetScientific plc

Portfolio company PDS Biotech Announces Clinical Strategy Update and Reports Full Year 2023 Financial Results

· Unique mechanism of action of the combination of PDS01ADC and Versamune® results in 3-year survival of 75% and 75% overall response rate in advanced head and neck cancer trial

· As a result, Company to focus late-stage clinical strategy on triple combination of PDS01ADC, PDS0101 (Versamune® HPV) and KEYTRUDA® in advanced head and neck cancer

· Strong safety profile of IL-12 fused antibody drug conjugate (PDS01ADC) demonstrated to date with data generated in >300 cancer patients; Versamune® HPV tested in >110 HNSCC patients

· Successful recent meeting with FDA provided clear guidance on trial design and regulatory pathway for pivotal randomised trial of triple combination in recurrent metastatic HPV-positive HNSCC

NetScientific Plc (AIM: NSCI), the deep tech and life sciences VC investment group, reports that its portfolio company PDS Biotechnology Corporation (Nasdaq: PDSB), in which it holds a 3.5% direct holding, a late-stage immunotherapy company focused on transforming how the immune system targets and kills cancers and the development of infectious disease vaccines, today announced an update to its clinical development strategy and reported its financial results for the year ended December 31, 2023. Extracts of the announcement are below.

Frank Bedu-Addo, PhD, Chief Executive Officer of PDS Biotech said:

"We have obtained compelling data from several Phase 2 trials in the fourth quarter of 2023, including long-term survival data from the National Cancer Institute (NCI)-led triple combination trial of PDS01ADC in combination with Versamune® HPV (PDS0101) and an investigational immune checkpoint inhibitor (ICI), as well as our VERSATILE-002 study. We now have a better understanding of how our drug platform technology works in advanced cancer, and we have therefore made the strategic, data-driven decision to add our novel, investigational IL-12 fused antibody drug conjugate, PDS01ADC, to the promising combination of Versamune® HPV and KEYTRUDA® to advance the triple combination as our top clinical development priority."

He continued:

"By initially addressing the rapidly growing unmet medical need in recurrent metastatic HPV+ head and neck squamous cell cancer (HNSCC), we strongly believe this approach may rapidly establish our proprietary combination of PDS01ADC and Versamune® HPV as a transformative oncology treatment. The data suggest that the triple combination may result in a significant improvement in overall survival rates for patients who currently lack an effective treatment option. It may also significantly increase the rates of durable tumour shrinkage or overall responses. We are grateful to the patients and physicians who participated in the clinical trials which have helped inform our understanding of how the drug therapies may be used most effectively to safely address advanced cancer, and our decision to prioritise the triple combination."

With the recent long-term survival Phase 2 data from the NCI-led triple combination trial, together with favourable safety and extended survival results seen in both ICI naïve and resistant patients in our VERSATILE-002 trial, PDS Biotech has decided to prioritise the triple combination in place of the VERSATILE-003 trial. This decision enables PDS Biotech to focus its resources on the drug regimen it believes has the highest potential to benefit patients with HNSCC and to drive shareholder value.

Kirk V. Shepard, M.D., Chief Medical Officer of PDS Biotech said:

"We have had several discussions with key opinion leaders in HNSCC regarding the use of the triple combination in HNSCC. A clear unmet need is seen in HPV+ HNSCC with few agents being studied in this population due to the difficulty in treating advanced HNSCC. These discussions with expert HNSCC oncologists have guided our decision to prioritise the triple combination in our efforts to address the growing incidence of advanced HPV+ HNSCC."

Katharine A. Price, M.D., Associate Professor of Oncology, Head and Neck Disease Group, Mayo Clinic Comprehensive Cancer Centre, and Principal Investigator of PDS Biotech's upcoming triple combination trial added:

"Despite good outcomes in many patients with HPV-related HNSCC, approximately 20% of patients will develop recurrent, incurable disease, often in young individuals in the prime of their lives. HPV-related HNSCC that progresses after standard first-line chemotherapy is a devastating, hard-to-treat cancer with no HPV-related treatment currently approved. The NCI clinical trial data show significant promise in the use of PDS01ADC in combination with Versamune® HPV. A controlled randomised clinical trial that builds upon the current data is warranted, and I am intrigued by the potential of this unique combination to treat HNSCC."

Clinical Strategy Update:Triple Combination Clinical Trial (PDS01ADC, Versamune® HPV and KEYTRUDA®)

· Company in discussions with the U.S. Food and Drug Administration (FDA) on the design of potentially pivotal clinical trial to treat HPV+ HNSCC, with the trial expected to start in 2024.

· Previously announced data from Phase 2 NCI-led triple combination clinical trial for the treatment of recurrent/metastatic ICI naïve and ICI resistant HPV16-positive cancers including head and neck, anal, cervical, vaginal, and vulvar cancers support rationale:

o ICI naïve group:

· 75% of patients remain alive at 36 months. The median overall survival (OS) was not reached. Published results show a 36-month survival rate of approximately 20% with ICIs. An overall response rate (ORR) of 75% and complete response of 38% were seen in patients treated with the triple combination. Published ORR of

o ICI resistant group:

· 12-month OS rate of 72%, and 63% ORR in patients with optimal dose of PDS01ADC. Median OS approximately 20 months; published 12-month OS rate in HPV-positive ICI-resistant cancer is ~30%; published median OS in HPV-positive ICI-resistant cancer is 3.4 months.

o Responses were seen in all HPV-positive tumour types.

Leadership Appointments

· In January 2024, announced the appointment of Dr. Shepard as Chief Medical Officer.

· In November 2023, announced the appointment of Lars Boesgaard as Chief Financial Officer.

Full Year 2023 Financial Results

Net loss for the year ended December 31, 2023, was approximately $42.9 million, or $1.39 per basic and diluted share, compared to a net loss of $40.9 million, or $1.43 per basic share and diluted share, for the year ended December 31, 2022. The higher net loss was primarily the result of increased operating loss and increased net interest expense.

Research and development expenses for the year ended December 31, 2023, decreased to $27.8 million, compared to $29.4 million for the year ended December 31, 2022. The decrease of $1.7 million was primarily attributable to the $10 million purchase of the rights to PDS01ADC in 2022, partially offset by an increase in clinical costs of $6.1 million and an increase in personnel costs of $2.1 million.

General and administrative expenses for the year ended December 31, 2023, increased to $15.3 million compared to $12.2 million for the year ended December 31, 2022. The $3.1 million increase was primarily attributable to an increase in personnel costs of $1.5 million and an increase in professional fees of $1.6 million.

Total operating expenses for the year ended December 31, 2023, were $43.0 million, an increase of approximately 3.3% compared to $41.7 million total operating expenses for the year ended December 31, 2022.

Net interest expense increased to $1.3 million for the year ended December 31, 2023, compared to $0.4 million for the year ended December 31, 2022. The change was due to higher interest expense related to the Company's notes payable, partially offset by higher interest income on bank deposits.

During the fourth quarter of 2023, the Company raised approximately $10.5 million in net proceeds from its "at-the-market" sales agreement.

The Company's cash balance as of December 31, 2023, was $56.6 million.

A full version of PDS Biotech's announcement can be accessed here:

https://pdsbiotech.com/index.php/investors/news-center/press-releases/press-releases1/131-2024-news/902-iotechnnounceslinicaltrategypdateandeports20240327

-Ends-

For more information, please contact:

About NetScientific

NetScientific plc (AIM: NSCI) is a deep tech and life sciences VC investment group with an international portfolio of innovative companies.

NetScientific identifies, invests in, and builds high growth companies in the UK and internationally. The company adds value through the proactive management of its portfolio, progressing to key value inflection points, and delivering investment returns through partial or full liquidity events.

NetScientific differentiates itself by employing a capital-efficient investment approach, making judicial use of its balance sheet and syndicating investments through its wholly owned VC subsidiary, EMV Capital. The group secures a mixture of direct equity stakes and carried interest stakes in its portfolio of companies, creating a lean structure that can support a large portfolio.

NetScientific is headquartered in London, United Kingdom, and is admitted to trading on AIM, a market operated by the London Stock Exchange.

www.netscientific.net

About PDS Biotechnology

PDS Biotechnology is a late-stage immunotherapy company focused on transforming how the immune system targets and kills cancers and the development of infectious disease vaccines. The Company plans to initiate a pivotal clinical trial in 2024 to advance its lead program in advanced head and neck squamous cell cancers (HNSCC). PDS Biotech's lead program is a proprietary dual-acting combination of antibody drug conjugate (ADC) PDS01ADC and T-cell activator Versamune® HPV in regimen with a standard-of-care immune checkpoint inhibitor. Proof-of-concept long-term data have shown positive survival results and tumor shrinkage with this combination and indicate favorable tolerability.

With a novel investigational "inside-out" mechanism, the dual immunotherapy has shown compelling results with potential to successfully disrupt a tumor's inside defenses, while also generating potent, targeted killer T-cells to attack the tumor from the outside. Robust data from more than 350 patients, as well as ongoing clinical trials across multiple tumor types and standard treatment regimens, have validated the platforms and point to potential broad utility.

Our Infectimune® based vaccines have demonstrated the potential to induce not only robust and durable neutralizing antibody responses, but also powerful T-cell responses, including long-lasting memory T-cell responses in pre-clinical studies to date.

www.pdsbiotech.com