Grifols Meets Enrollment Target in Phase 3 Study of Two Dose Regimens of Prolastin®-C in Patients with Emphysema Due to Alpha-1-Antitrypsin Deficiency

Grifols (MCE: GRF, MCE: GRF.P NASDAQ: GRFS), one of the world’s leading producers of plasma-derived medicines, today announced it has met its enrollment target of 339 patients in SPARTA (Study of ProlAstin-c Randomized Therapy with Alpha-1 augmentation; NCT01983241), its phase 3 clinical trial designed to determine if alpha-1- antitrypsin (AAT) deficiency (alpha-1) patients with emphysema have a slower progression of lung tissue loss when treated weekly with two separate dose regimens of Grifols Prolastin®-C.
Alpha-1 is an underdiagnosed2 genetic disorder that can result in chronic obstructive pulmonary disease (COPD), a group of respiratory diseases that includes emphysema, which can occur when a patient has low levels of alpha-1 antitrypsin (AAT), a protective protein that safeguards the lungs. The currently approved dosage is 60 mg/kg in weekly infusions.
SPARTA, the largest randomized, double-blind, placebo-controlled study on AAT augmentation therapy to-date, is designed to evaluate the potential of Prolastin®-C to significantly reduce emphysema progression in alpha-1 patients by raising AAT protein levels through weekly administration of two active dose levels versus placebo.
The clinical trial is taking place across 16 countries and more than 50 sites. It will evaluate the efficacy and safety of two separate dose regimens of Prolastin®-C (60 and 120 mg/kg/week) versus placebo for 156 weeks (i.e., three years), measuring the rate of pulmonary-tissue loss through whole lung computed tomography (CT) densitometry as the primary measure of clinical efficacy.
“While alpha-1 patients currently benefit from recommended AAT augmentation therapy, we hope to show clinical evidence of benefit with the current approved dose and a greater impact by doubling the single dose to 120 mg/kg weekly,” said Sandra Camprubi, Grifols Senior Director Clinical Operations. “We look forward to providing topline data from this study in 2026 and evaluating the next regulatory steps to provide emphysema patients impactful treatment options for alpha-1.”
The company’s robust innovation pipeline includes a strong commitment to supporting the alpha-1 community. Earlier this year, Grifols launched its AlphaID™ At Home Genetic Health Risk Service (AlphaID™ At Home), the first-ever free direct-to-consumer program in the U.S. to screen for the genetic risk of alpha-1.
About Alpha-1 and COPD
Alpha-1-antitrypsin deficiency, also known as alpha-1, is a rarely diagnosed genetic disease that can result in chronic obstructive pulmonary disease (COPD), a group of respiratory diseases that includes emphysema, a lung condition that causes shortness of breath. Patients who have alpha-1 have a genetic deficiency of alpha-1 antitrypsin, a protective plasma protein that safeguards the lungs from inflammation caused by infection and inhaled irritants such as tobacco smoke. Alpha-1 is the major known genetic risk factor for COPD3.
About Prolastin®-C
PROLASTIN®-C is an alpha1-proteinase inhibitor (human) (alpha1-PI) indicated for chronic augmentation and maintenance therapy in adults with clinical evidence of emphysema due to severe hereditary deficiency of alpha1-PI (alpha-1-antitrypsin deficiency).
PROLASTIN®-C is contraindicated in immunoglobulin A (IgA)-deficient patients with antibodies against IgA or patients with a history of anaphylaxis or other severe systemic reaction to alpha1-PI products. Hypersensitivity reactions, including anaphylaxis, may occur. Monitor vital signs and observe the patient carefully throughout the infusion. If hypersensitivity symptoms occur, promptly stop PROLASTIN®-C infusion and begin appropriate therapy. Because PROLASTIN®-C is made from human plasma, it may carry a risk of transmitting infectious agents, e.g., viruses, the variant Creutzfeldt-Jakob disease (vCJD) agent, and, theoretically, the Creutzfeldt-Jakob disease (CJD) agent. This also applies to unknown or emerging viruses and other pathogens. The most common drug-related adverse reaction observed at a rate of >5% in subjects receiving PROLASTIN®-C was upper respiratory tract infection. The most serious adverse reaction observed during clinical trials with PROLASTIN®-C was an abdominal and extremity rash in 1 subject.
For full US Prescribing Information, please visit here.
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