GA is an advanced stage of age-related macular degeneration (AMD) and is characterized by loss of photoreceptors, retinal pigment epithelium, and choriocapillaris. In the early stages of GA, patients typically show minimal changes in central visual acuity although patients often still experience significant symptoms from visual dysfunction, such as reduced contrast sensitivity, and a decrease in reading speed. In the later stages, as the GA lesion expands into the fovea, a profound decrease in central visual acuity occurs with a decline in activities of daily living. The change in GA lesion area was measured by FAF and analysis of FAF images was performed by the central reading center. A positive change from baseline indicates an increase in size of GA lesion area (worsening; disease progression).

Modified intent-to-treat (mITT) population includes all randomized patients who received at least one dose of study drug, and have a baseline measurement and at least one post-baseline measurement of GA area by FAF, subjects grouped according to treatment assigned at randomization. Participants analyzed in this outcome measure were those included in mixed models for repeated measures (MMRM) analysis.

An AE was defined as any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether considered related to the medicinal product, any new disease or exacerbation of an existing disease, recurrence of an intermittent medical condition, or any deterioration in a laboratory value or other clinical test. Ocular AEs are the events which are localized in the ocular region.

Safety analysis population included all randomized participants who received at least one dose of study drug.

An AE was defined as any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether considered related to the medicinal product, any new disease or exacerbation of an existing disease, recurrence of an intermittent medical condition, or any deterioration in a laboratory value or other clinical test. Ocular AEs are the events which are localized in the ocular region.

Safety analysis population included all randomized participants who received at least one dose of study drug.

An AE was defined as any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether considered related to the medicinal product, any new disease or exacerbation of an existing disease, recurrence of an intermittent medical condition, or any deterioration in a laboratory value or other clinical test. Non-ocular AEs were the systemic events.

Safety analysis population included all randomized participants who received at least one dose of study drug.

SAEs are defined as fatal, life threatening, requires or prolongs patient hospitalization, results in persistent or significant disability/incapacity, or is a significant medical event in the investigator's judgement.

Safety analysis population included all randomized participants who received at least one dose of study drug.

AESIs include 1.) cases of potential drug-induced liver injury that include an elevated alanine transaminase (ALT) or aspartate aminotransferase (AST) in combination with either an elevated bilirubin or clinical jaundice, as defined by Hy's Law 2.) Suspected transmission of an infectious agent by galegenimab 3.) AEs resulting from medication error 4.) Sight-threatening AEs of the following criteria: It causes a decrease of >= 30 letters in visual acuity (VA) score, compared with the most recent prior VA assessment, that lasts more than 1 hour and is attributable to galegenimab; it requires surgical intervention to prevent permanent loss of sight; associated with severe (Grade 4+) intraocular inflammation (IOI) and/or IOI-associated retinal vasculitis; in the opinion of the investigator, it may require medical intervention to prevent permanent loss of sight.

Safety analysis population included all randomized participants who received at least one dose of study drug.

An AE was defined as any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether considered related to the medicinal product, any new disease or exacerbation of an existing disease, recurrence of an intermittent medical condition, or any deterioration in a laboratory value or other clinical test. Non-ocular AEs were the systemic events.

Safety analysis population included all randomized participants who received at least one dose of study drug.

BCVA score was based on the number of letters read correctly on the ETDRS visual acuity chart assessed at a starting distance of 4 meters (m) under low-luminance conditions. A decrease in the VA score indicates a worsening in visual acuity. BCVA score testing was performed prior to dilating the eyes. BCVA score ranges from 0 to 100 letters in the study eye. The lower the number of letters read correctly on the eye chart, the worse the vision (or visual acuity). A negative change from baseline indicates a decrease in the visual acuity.

mITT population includes all randomized patients who received at least one dose of study drug, and have a baseline measurement and at least one post-baseline measurement of GA area by FAF, subjects grouped according to treatment assigned at randomization. Participants analyzed in this outcome measure were those included in mixed models for repeated measures (MMRM) analysis.

BCVA score was based on the number of letters read correctly on the ETDRS visual acuity chart assessed at a starting distance of 4 meters (m). A decrease in the VA score indicates a worsening in visual acuity. BCVA score testing was performed prior to dilating the eyes. BCVA score ranges from 0 to 100 letters in the study eye. The lower the number of letters read correctly on the eye chart, the worse the vision (or visual acuity). A negative change from baseline indicates a decrease in the visual acuity.

mITT population includes all randomized patients who received at least one dose of study drug, and have a baseline measurement and at least one post-baseline measurement of GA area by FAF, subjects grouped according to treatment assigned at randomization. Participants analyzed in this outcome measure were those included in mixed models for repeated measures (MMRM) analysis.