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Prothena Reports First Quarter 2023 Financial Results and Business Highlights

  • Net cash used in operating and investing activities was $47.5 million in the first quarter of 2023; quarter-end cash and restricted cash position was $688.4 million
  • Data reported in an oral presentation at AD/PD 2023 that PRX012, a potential best-in-class anti-amyloid beta antibody, demonstrated higher affinity binding to amyloid beta soluble protofibrils and greater clearance of pyroglutamate-modified amyloid beta plaques compared to other approved and investigational molecules
  • Topline data reported from Phase 1 SAD study of PRX005, a novel anti-MTBR-tau antibody, meeting the primary study objective

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 2023 and provided business highlights.

“Recent positive clinical study results and FDA approvals have now established that reduction of amyloid beta plaque is directly related to clinical benefit. These results are positive for the Alzheimer’s disease community, especially for the patients, families and caregivers who fight everyday against this devastating disease. Prothena is committed to furthering these efforts by developing patient-centric, next-generation Alzheimer’s disease treatments,” said Gene Kinney, Ph.D., President and Chief Executive Officer, Prothena. “We showcased our potential best-in-class Alzheimer’s disease portfolio in the first quarter of 2023 with new preclinical data presented at AD/PD which adds to the scientific foundation for our PRX012 program. These data demonstrated higher affinity binding to amyloid beta soluble protofibrils and greater clearance of pyroglutamate-modified amyloid beta plaques compared to other approved and investigational molecules. In addition, we released topline data from the Phase 1 SAD study of PRX005 which demonstrated that single doses of PRX005 across three dose cohorts were generally safe and well tolerated.

“We look forward to making meaningful advances in our Alzheimer’s disease portfolio this year. We also continue to focus on enrolling our confirmatory Phase 3 AFFIRM-AL study of birtamimab, the first potential therapy to observe a significant survival benefit in patients with Mayo Stage IV AL amyloidosis,” added Kinney.

First Quarter, Recent Business Highlights and Upcoming Milestones

Neurodegenerative Diseases Portfolio

Alzheimer’s Disease (AD)

PRX012, a wholly-owned potential best-in-class, next-generation subcutaneous antibody for the treatment of AD, 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 AD.

  • Multiple presentations at International Conference on Alzheimer’s and Parkinson’s Diseases 2023 (AD/PD) highlighted by an oral presentation of preclinical data showing superior binding characteristics of PRX012, demonstrated 20-fold higher affinity to Aβ soluble protofibrils when compared to lecanemab; PRX012 also cleared pyroglutamate-modified Aβ at lower concentrations when compared to donanemab
  • Partnered with Walgreens to accelerate patient identification and recruitment for ongoing ASCENT-2 multiple ascending dose (MAD) clinical trial evaluating safety and tolerability
  • Ongoing Phase 1 single ascending dose (SAD) and MAD studies; topline data expected year end 2023

PRX005, a potential best-in-class antibody for the treatment of AD, specifically targets a key epitope within the microtubule binding region (MTBR) of tau, a protein implicated in diseases including AD, frontotemporal dementia (FTD), progressive supranuclear palsy (PSP), chronic traumatic encephalopathy (CTE), and other tauopathies. PRX005 is part of a global neuroscience research and development collaboration with Bristol Myers Squibb.

  • Topline data from Phase 1 SAD study announced January 2023 showing single doses of PRX005 across three dose cohorts were generally safe and well tolerated, meeting the primary study objective; results expected from the Phase 1 SAD study at an upcoming medical conference
  • Ongoing Phase 1 MAD study; topline data expected by year end 2023

PRX123, a wholly-owned potential first-in-class dual Aβ/tau vaccine for the treatment and prevention of AD, 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

  • Investigational new drug (IND) application filing expected by year end 2023

Parkinson’s Disease (PD)

Prasinezumab, a potential first-in-class antibody for the treatment of PD, is designed to target a key epitope within the C-terminus of alpha-synuclein and is the focus of a worldwide collaboration with Roche

  • Poster and oral presentations at AD/PD highlighted aspects of the Phase 2 PASADENA study of prasinezumab for the treatment of PD
  • In Q1 2023, Roche completed enrollment for the Phase 2b PADOVA trial in patients with early PD (NCT04777331); topline data expected in 2024

Rare Peripheral Amyloid Diseases Portfolio

AL Amyloidosis

Birtamimab, a wholly-owned potential best-in-class amyloid depleter antibody for the treatment of AL amyloidosis, is designed to directly neutralize soluble toxic 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 (i.e. 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.

  • Confirmatory Phase 3 AFFIRM-AL trial in patients with Mayo Stage IV AL amyloidosis, which is under a Special Protocol Assessment (SPA) with the FDA with a primary endpoint of all-cause mortality at p≤0.10, is ongoing (NCT04973137); topline data expected in 2024

ATTR Amyloidosis

NNC6019 (formerly PRX004), a potential first-in-class amyloid depleter antibody for the treatment of ATTR cardiomyopathy, is 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 study in patients with ATTR cardiomyopathy is being conducted by Novo Nordisk (NCT05442047); topline data expected in 2024

First Quarter of 2023 Financial Results

For the first quarter of 2023, Prothena reported net loss of $46.9 million, as compared to a net loss of $36.3 million for the first quarter of 2022. Net loss per share was $0.89 for the first quarter of 2023, as compared to net loss per share of $0.78 for the first quarter of 2022.

Prothena reported total revenue of $2.2 million for the first quarter of 2023, as compared to total revenue of $1.2 million for the first quarter of 2022, primarily from collaboration revenue from Bristol Myers Squibb.

Research and development (R&D) expenses totaled $44.8 million for the first quarter of 2023, as compared to $27.3 million for the first quarter of 2022. The increase in R&D expense for the first quarter of 2023 compared to the same period in the prior year was primarily due to higher clinical trial expenses, higher personnel related expenses, higher consulting and other R&D expenses. R&D expenses included non-cash share-based compensation expense of $4.4 million for the first quarter of 2023, as compared to $3.3 million for the first quarter of 2022.

General and administrative (G&A) expenses totaled $13.7 million for the first quarter of 2023, as compared to $11.8 million for the first quarter of 2022. The increase in G&A expenses for the first quarter of 2023 compared to the same period in the prior year was primarily related to higher personnel related and legal expenses. G&A expenses included non-cash share-based compensation expense of $4.4 million for the first quarter of 2023, as compared to $4.3 million for the first quarter of 2022.

Total non-cash share-based compensation expense was $8.8 million for the first quarter of 2023, as compared to $7.7 million for the first quarter of 2022.

As of March 31, 2023, Prothena had $688.4 million in cash, cash equivalents and restricted cash, and no debt.

As of April 28, 2023, Prothena had approximately 52.8 million ordinary shares outstanding.

2023 Financial Guidance

The Company continues to expect the full year 2023 net cash used in operating and investing activities to be $213 to $229 million and expects to end the year with approximately $512 million in cash, cash equivalents and restricted cash (midpoint). The estimated full year 2023 net cash used in operating and investing activities is primarily driven by an estimated net loss of $250 to $275 million, which includes an estimated $46 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; the continued advancement of our discovery, preclinical, and clinical pipeline, and expected milestones in 2023 and beyond; the treatment potential, designs, proposed mechanisms of action, and potential administration of birtamimab, prasinezumab, NNC6019/PRX004, PRX005, PRX012, and PRX123; plans for future clinical studies of birtamimab, prasinezumab, NNC6019/PRX004, PRX005, PRX012, and PRX123 (including the filing of an IND application); the expected timing of reporting data from clinical studies of birtamimab, prasinezumab, PRX005, and PRX012; our anticipated net cash burn from operating and investing activities for 2023 and expected cash balance at the end of 2023; and our estimated net loss and non-cash share-based compensation expense for 2023. 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 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 4, 2023, 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,

 

 

 

 

2023

 

 

 

2022

 

 

Collaboration revenue

 

$

2,119

 

 

$

1,103

 

 

Revenue from license and intellectual property

 

 

50

 

 

 

50

 

 

Total revenue

 

 

2,169

 

 

 

1,153

 

 

Operating expenses:

 

 

 

 

 

Research and development

 

 

44,756

 

 

 

27,262

 

 

General and administrative

 

 

13,738

 

 

 

11,835

 

 

Total operating expenses

 

 

58,494

 

 

 

39,097

 

 

Loss from operations

 

 

(56,325

)

 

 

(37,944

)

 

Other income (expense), net

 

 

6,549

 

 

 

(17

)

 

Loss before income taxes

 

 

(49,776

)

 

 

(37,961

)

 

Benefit from income taxes

 

 

(2,912

)

 

 

(1,671

)

 

Net loss

 

$

(46,864

)

 

$

(36,290

)

 

Basic net loss per ordinary share

 

$

(0.89

)

 

$

(0.78

)

 

Diluted net loss per ordinary share

 

$

(0.89

)

 

$

(0.78

)

 

Shares used to compute basic net loss per share

 

 

52,501

 

 

 

46,704

 

 

Shares used to compute diluted net loss per share

 

 

52,501

 

 

 

46,704

 

 

PROTHENA CORPORATION PLC

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited - amounts in thousands)

 

 

March 31,

 

December 31,

 

2023

 

2022

Assets

 

 

 

Cash and cash equivalents

$

686,184

 

$

710,406

Prepaid expenses and other current assets

 

14,159

 

 

8,692

Total current assets

 

700,343

 

 

719,098

Property and equipment, net

 

1,924

 

 

1,731

Operating lease right-of-use assets

 

4,719

 

 

6,277

Restricted cash, non-current

 

2,212

 

 

2,212

Other non-current assets

 

32,388

 

 

28,717

Total non-current assets

 

41,243

 

 

38,937

Total assets

$

741,586

 

$

758,035

Liabilities and Shareholders’ Equity

 

 

 

Accrued research and development

 

14,156

 

 

10,794

Deferred revenue, current

 

9,323

 

 

11,442

Lease liability, current

 

4,885

 

 

6,473

Other current liabilities

 

20,520

 

 

21,438

Total current liabilities

 

48,884

 

 

50,147

Deferred revenue, non current

 

85,293

 

 

85,293

Other non-current liabilities

 

 

 

553

Total non-current liabilities

 

85,293

 

 

85,846

Total liabilities

 

134,177

 

 

135,993

Total shareholders’ equity

 

607,409

 

 

622,042

Total liabilities and shareholders’ equity

$

741,586

 

$

758,035

 

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