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Prothena Reports First Quarter 2024 Financial Results and Business Highlights

  • Net cash used in operating and investing activities was $73.2 million in the first quarter of 2024; quarter-end cash and restricted cash position was $548.7 million
  • Advanced potential best-in-class Alzheimer’s disease portfolio: initial data supportive of ongoing Phase 1 clinical trial for PRX012, an anti-amyloid beta antibody; received FDA clearance for IND application and Fast Track designation for PRX123, a dual amyloid beta/tau vaccine; Phase 2 clinical trial initiated in patients with early Alzheimer’s disease for BMS-986446 (formerly PRX005) by partner Bristol Myers Squibb
  • Strengthened leadership position in the amyloidosis community with ongoing enrollment of the confirmatory Phase 3 AFFIRM-AL clinical trial of birtamimab in patients with Mayo Stage IV AL amyloidosis; published birtamimab mechanism of action and pharmacological characteristics in Leukemia & Lymphoma in April 2024
  • Daniel G. Welch appointed to Prothena Board of Directors as an independent director and Chair Designate

Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical biotechnology company with a robust pipeline of investigational therapeutics built on protein dysregulation expertise, today reported financial results for the first quarter of 2024 and provided business highlights.

“We continued to meaningfully advance our wholly-owned and partnered programs across our protein dysregulation portfolio, highlighted by our ongoing clinical programs, as we continue to move closer to becoming a fully integrated commercial company. We look forward to multiple upcoming clinical milestones and program updates over the next 15 months from our wholly-owned programs, including topline data from the confirmatory Phase 3 AFFIRM-AL clinical trial for birtamimab, Phase 1 data on PRX012, and an update on timing of the Phase 1 program for PRX123,” said Gene Kinney, Ph.D., President and Chief Executive Officer, Prothena. “Our partnership with Bristol Myers Squibb achieved an important milestone in 2024, as BMS-986446, an anti-tau monoclonal antibody, began recruiting patients with early Alzheimer’s disease into a Phase 2 clinical trial. Partner Roche presented important four-year data at AD/PD 2024 from the Phase 2 PASADENA open label extension trial of prasinezumab which impressively continues to show reduced motor and functional progression compared to real-world data from the Michael J. Fox Foundation. In addition, we expect topline readouts from our partners Roche, with Phase 2b PADOVA data on prasinezumab expected in the second half of 2024, and Novo Nordisk, with Phase 2 data on NNC6019 expected in the first half of 2025.”

First Quarter, Recent Business Highlights and Upcoming Milestones

Alzheimer’s Disease

PRX012, a wholly-owned potential best-in-class, next-generation antibody delivered subcutaneously for the treatment of Alzheimer’s disease that targets a key epitope at the N-terminus of amyloid beta (Aβ) with high binding potency. The U.S. Food and Drug Administration (FDA) has granted Fast Track designation for PRX012 for the treatment of Alzheimer’s disease.

  • Initial Phase 1 single ascending dose (SAD) and multiple ascending dose (MAD) data supports once-monthly subcutaneous administration and ongoing evaluation in MAD cohorts
  • Phase 1 clinical trial continues as planned and expect to update in 2024

BMS-986446 (formerly PRX005), a potential best-in-class antibody for the treatment of Alzheimer’s disease that specifically targets a key epitope within the microtubule binding region (MTBR) of tau, a protein implicated in the causal pathophysiology of Alzheimer’s disease. BMS-986446 is part of a Global Neuroscience Research and Development Collaboration with Bristol Myers Squibb.

  • Bristol Myers Squibb has initiated a Phase 2 clinical trial in approximately 475 patients with early Alzheimer’s disease for BMS-986446 (NCT06268886)
  • Bristol Myers Squibb is responsible for all development, manufacturing, and commercialization of BMS-986446

PRX123, a wholly-owned potential first-in-class dual Aβ/tau vaccine designed for the treatment and prevention of Alzheimer’s disease, is a dual-target vaccine targeting key epitopes within the N-terminus of Aβ and MTBR-tau designed to promote amyloid clearance and block the transmission of pathogenic tau. The FDA cleared the investigational new drug (IND) application and granted Fast Track designation for PRX123 for the treatment of Alzheimer’s disease.

  • Phase 1 timeline update expected in 2024

Parkinson’s Disease

Prasinezumab, a potential first-in-class antibody for the treatment of Parkinson’s disease that is designed to target key epitopes within the C-terminus of alpha-synuclein, and is the focus of a worldwide collaboration with Roche

  • Data from partner Roche from Phase 2 PASADENA clinical trial presented at AD/PD 2024 showed patients with early Parkinson’s disease taking prasinezumab after four years continued to show reduced motor and functional progression compared to real-world data
  • Data from partner Roche on motor progression in four pre-specified subpopulations from the Phase 2 PASADENA clinical trial published in Nature Medicine
  • Topline results from Phase 2b PADOVA clinical trial in patients with early Parkinson’s disease, which has completed enrollment, expected in 2H 2024 (NCT04777331)

Neurodegenerative Diseases

PRX019, a potential treatment of neurodegenerative diseases with an undisclosed target, is part of a Global Neuroscience Research and Development Collaboration with Bristol Myers Squibb.

  • Phase 1 clinical trial timeline update expected in 2024

Rare Peripheral Amyloid Diseases Portfolio

AL Amyloidosis

Birtamimab, a wholly-owned potential best-in-class anti-amyloid antibody for the treatment of AL amyloidosis designed to directly neutralize soluble toxic light chain aggregates and promote clearance of amyloid that causes organ dysfunction and failure. Among patients with AL amyloidosis, a rare, progressive, and fatal disease, newly diagnosed individuals with advanced disease (e.g., Mayo Stage IV) are at the highest risk for early death. Birtamimab has been granted Fast Track designation by the FDA for the treatment of patients with Mayo Stage IV AL amyloidosis to reduce the risk of mortality and has been granted Orphan Drug Designation by both the FDA and European Medicines Agency. A significant survival benefit was observed in the post hoc analysis of birtamimab-treated patients categorized as Mayo Stage IV at baseline in the previous Phase 3 VITAL clinical trial (Blood 2023).

  • Birtamimab mechanism of action and pharmacological characteristics published in Leukemia & Lymphoma in April 2024
  • The ongoing confirmatory Phase 3 AFFIRM-AL clinical trial in patients with Mayo Stage IV AL amyloidosis is being conducted under a Special Protocol Assessment (SPA) agreement with the FDA with a primary endpoint of all-cause mortality (time-to-event) at a significance level of 0.10
  • Topline results from confirmatory AFFIRM-AL Phase 3 clinical trial expected between 4Q 2024 and 2Q 2025 (NCT04973137)

ATTR Amyloidosis

NNC6019 (formerly PRX004), a potential first-in-class amyloid depleter antibody for the treatment of ATTR cardiomyopathy designed to deplete the pathogenic, non-native forms of the transthyretin (TTR) protein and is being developed by Novo Nordisk as part of their up to $1.2 billion acquisition of Prothena’s ATTR amyloidosis business and pipeline

  • Ongoing Phase 2 clinical trial in patients with ATTR cardiomyopathy is being conducted by Novo Nordisk
  • The Phase 2 clinical trial has completed enrollment with topline data expected in 1H 2025 (NCT05442047)

Corporate Highlights

  • Following a comprehensive search process in connection with Prothena’s regular Board of Directors succession planning, the Company appointed Daniel G. Welch to the Board of Directors as an independent director and Chair Designate
  • Prothena announced the appointment of David Ford to a newly created position of Chief People Officer in March 2024. In this role, Mr. Ford is responsible for people, culture, and human resources strategy to drive the company’s vision and overall growth strategy.

First Quarter of 2024 Financial Results

For the first quarter of 2024, Prothena reported a net loss of $72.2 million, as compared to a net loss of $46.9 million for the first quarter of 2023, respectively. Net loss per share was $1.34 for the first quarter of 2024, as compared to net loss per share of $0.89 for the first quarter of 2023, respectively.

Prothena reported total revenue of $0.1 million for the first quarter of 2024, as compared to total revenue of $2.2 million for the first quarter of 2023. Total revenue for the first quarter of 2024 was from license fees recognized under a License Agreement with F. Hoffmann-La Roche Ltd. and total revenue for the first quarter of 2023 was primarily from collaboration revenue from Bristol Myers Squibb.

Research and development (R&D) expenses totaled $64.1 million for the first quarter of 2024, as compared to $44.8 million for the first quarter of 2023. The increase in R&D expenses for the first quarter of 2024 compared to the same period in the prior year was primarily due to higher clinical trial expenses, higher personnel related expenses and higher manufacturing expenses. R&D expenses included non-cash share-based compensation expense of $5.5 million for the first quarter of 2024, as compared to $4.4 million for the first quarter of 2023.

General and administrative (G&A) expenses totaled $17.5 million for the first quarter of 2024, as compared to $13.7 million for the first quarter of 2023. The increase in G&A expenses for the first quarter of 2024 compared to the same period in the prior year was primarily related to higher personnel related and consulting expenses. G&A expenses included non-cash share-based compensation expense of $6.9 million for the first quarter of 2024, as compared to $4.4 million for the first quarter of 2023.

Total non-cash share-based compensation expense was $12.4 million for the first quarter of 2024, as compared to $8.8 million for the first quarter of 2023.

As of March 31, 2024, Prothena had $548.7 million in cash, cash equivalents and restricted cash, and no debt.

As of May 1, 2024, Prothena had approximately 53.8 million ordinary shares outstanding.

2024 Financial Guidance

The Company continues to expect the full year 2024 net cash used in operating and investing activities to be $208 to $225 million and expects to end the year with approximately $405 million in cash, cash equivalents and restricted cash (midpoint). The estimated full year 2024 net cash used in operating and investing activities is primarily driven by an estimated net loss of $229 to $255 million, which includes an estimated $51 million of non-cash share-based compensation expense.

About Prothena

Prothena Corporation plc is a late-stage clinical biotechnology company with expertise in protein dysregulation and a pipeline of investigational therapeutics with the potential to change the course of devastating neurodegenerative and rare peripheral amyloid diseases. Fueled by its deep scientific expertise built over decades of research, Prothena is advancing a pipeline of therapeutic candidates for a number of indications and novel targets for which its ability to integrate scientific insights around neurological dysfunction and the biology of misfolded proteins can be leveraged. Prothena’s pipeline includes both wholly-owned and partnered programs being developed for the potential treatment of diseases including AL amyloidosis, ATTR amyloidosis, Alzheimer’s disease, Parkinson’s disease and a number of other neurodegenerative diseases. For more information, please visit the Company’s website at www.prothena.com and follow the Company on Twitter @ProthenaCorp.

Forward-Looking Statements

This press release contains forward-looking statements. These statements relate to, among other things, the sufficiency of our cash position to fund advancement of a broad pipeline and completion of our ongoing clinical trials; the continued advancement of our discovery, preclinical, and clinical pipeline, and expected milestones in 2024, 2025, and beyond; the treatment potential, designs, proposed mechanisms of action, and potential administration of PRX012, BMS-986446/PRX005, PRX123, prasinezumab, PRX019, birtamimab, and NNC6019/PRX004; plans for ongoing and future clinical trials of PRX012, BMS-986446/PRX005, PRX123, prasinezumab, PRX019, birtamimab, and NNC6019/PRX004; the expected timing of reporting data from clinical trials, including any updates regarding our ongoing Phase 1 clinical trial evaluating PRX012 in 2024 and topline study results for our Phase 3 AFFIRM-AL clinical trial between 4Q 2024 and 2Q 2025; our anticipated net cash used from operating and investing activities for 2024 and expected cash balance at the end of 2024; and our estimated net loss and non-cash share-based compensation expense for 2024. These statements are based on estimates, projections and assumptions that may prove not to be accurate, and actual results could differ materially from those anticipated due to known and unknown risks, uncertainties and other factors, including but not limited to uncertainties related to the completion of operational and financial closing procedures, audit adjustments and other developments that may arise that would require adjustments to the preliminary financial results included in this press release, as well as those described in the “Risk Factors” sections of our Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (SEC) on May 8, 2024, and discussions of potential risks, uncertainties, and other important factors in our subsequent filings with the SEC. We undertake no obligation to update publicly any forward-looking statements contained in this press release as a result of new information, future events, or changes in our expectations.

PROTHENA CORPORATION PLC

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited - amounts in thousands except per share data)

 

 

 

Three Months Ended March 31,

 

 

 

2024

 

 

 

2023

 

Collaboration revenue

 

$

 

 

$

2,119

 

Revenue from license and intellectual property

 

 

50

 

 

 

50

 

Total revenue

 

 

50

 

 

 

2,169

 

Operating expenses:

 

 

 

 

Research and development

 

 

64,114

 

 

 

44,756

 

General and administrative

 

 

17,464

 

 

 

13,738

 

Total operating expenses

 

 

81,578

 

 

 

58,494

 

Loss from operations

 

 

(81,528

)

 

 

(56,325

)

Total other income, net

 

 

7,088

 

 

 

6,549

 

Loss before income taxes

 

 

(74,440

)

 

 

(49,776

)

Benefit from income taxes

 

 

(2,201

)

 

 

(2,912

)

Net loss

 

$

(72,239

)

 

$

(46,864

)

Basic net income (loss) per ordinary share

 

$

(1.34

)

 

$

(0.89

)

Diluted net income (loss) per ordinary share

 

$

(1.34

)

 

$

(0.89

)

Shares used to compute basic net income (loss) per share

 

 

53,714

 

 

 

52,501

 

Shares used to compute diluted net income (loss) per share

 

 

53,714

 

 

 

52,501

 

PROTHENA CORPORATION PLC

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited - amounts in thousands)

 

 

March 31,

 

December 31,

 

 

2024

 

 

 

2023

 

Assets

 

 

 

Cash and cash equivalents

$

546,512

 

$

618,830

Restricted cash, current

 

1,352

 

 

 

1,352

 

Prepaid expenses and other current assets

��

18,004

 

 

 

19,100

 

Total current assets

 

565,868

 

 

 

639,282

 

Property and equipment, net

 

3,672

 

 

 

3,836

 

Operating lease right-of-use assets

 

12,510

 

 

 

12,162

 

Restricted cash, non-current

 

860

 

 

 

860

 

Other non-current assets

 

40,284

 

 

 

40,242

 

Total non-current assets

 

57,326

 

 

 

57,100

 

Total assets

$

623,194

 

 

$

696,382

 

Liabilities and Shareholders’ Equity

 

 

 

Accrued research and development

 

17,340

 

 

 

14,724

 

Lease liability, current

 

2,372

 

 

 

1,114

 

Other current liabilities

 

23,554

 

 

 

41,053

 

Total current liabilities

 

43,266

 

 

 

56,891

 

Deferred revenue, non-current

 

67,405

 

 

 

67,405

 

Lease liability, non-current

 

10,124

 

 

 

10,721

 

Total non-current liabilities

 

77,529

 

 

 

78,126

 

Total liabilities

 

120,795

 

 

 

135,017

 

Total shareholders’ equity

 

502,399

 

 

 

561,365

 

Total liabilities and shareholders’ equity

$

623,194

 

 

$

696,382

 

 

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