| Primary | Change From Baseline in PACC-5 Score | The PACC-5 is computed as the average of z-scores of the following cognitive measures: 1. Wechsler Memory Scale (WMS LM I-II) - Total Score LM II Delayed Recall; 2. Free & Cued Selective Reminding Test (FCSRT) -Immediate and Delayed Recall - Trials 1-3: Total Recall; 3. Wechsler Adult Intelligence Scale (WAIS) - IV Coding - Total Raw Score; 4. Mini Mental State Examination (MMSE) - Total Score; 5. Category Fluency Test (CFT) - 3 categories - Vegetables, Fruits and Animals - Total Admissible Words. The z-score was defined as the difference between the assessment and the mean of baseline assessments, divided by the standard deviation of baseline assessments. Z-scores range from -3 to +3 with higher scores indicating better cognitive performance. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Mean | Standard Deviation | score on a scale | | Baseline to early termination visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
| | | Title | Denominators | Categories |
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| | | Title | Measurements |
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| - OG000-0.052± 0.5790
- OG001-0.119± 0.6038
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| Secondary | Time From Randomization to Clinical Progression to Mild Cognitive Impairment (MCI) or Dementia Due to AD | Time from randomization to clinical progression to mild cognitive impairment or dementia due to Alzheimer's disease was based on the diagnosis of the independent Clinical Adjudication Committee (iCAC). | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. | Posted | | Median | 95% Confidence Interval | weeks | | Randomization to early termination Visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Time to Onset of Confirmed Clinical Progression | Time to onset of confirmed clinical progression was defined as the time from randomization to the first occurrence of two consecutive visits (approximately 6 months apart) with a Clinical Dementia Rating Global Score (CDR-GS) of > 0. CDR is a clinician reported (ClinRO) measure used to stage severity of AD dementia based on a semi-structured interview with participant & a reliable informant. CDR characterizes participant's level of cognitive & functional impairment across six domains (memory, orientation, judgment & problem solving, community affairs, home & hobbies, & personal care) on a 5-point rating. CDR-GS is calculated based on the Washington University CDR-assignment algorithm & characterizes a participant's level of global impairment/stage of dementia according to following categories: 0 (normal), 0.5 (very mild dementia), 1 (mild dementia), 2 (moderate dementia), & 3 (severe dementia). Score ranges from 0 to 3 & a high score on CDR-GS would indicate a high disease severity. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. | Posted | | Median | 95% Confidence Interval | weeks | | Randomization to early termination Visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change From Baseline in the Amsterdam Instrumental Activities of Daily Living Questionnaire Short Version (A-IADL-Q-SV) | A-IADL-Q-SV=observer reported (ObsRO) measure assessing participant's ability to perform instrumental activities of daily living (including household/leisure activities, use of household appliances, management of finances, etc.). A-IADL-Q-SV includes 30 items rated by study partner. Each item is divided into 2 questions=1st question asks if activity was performed by participant during past 4 weeks (Yes/No/Don't know). If performed, 2nd question captures level of difficulty while performing activity on 5-point Likert scale (no difficulty to no longer able to perform the activity). If not performed, 2nd question captures why activity was not performed (never done before, no longer able to do so due to physical problems, no longer able to do so due to difficulties with memory/planning/thinking/other, including free text response). A-IADL-Q-SV=average of all scored responses multiplied by 25. Score range=0-100. Higher scores=better functioning. Negative change from baseline=worsening. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Mean | Standard Deviation | score on a scale | | Baseline to early termination visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change From Baseline in the Cognitive Function Instrument Acute (CFIa) Participant Version | The CFIa is an outcome measure developed to assess memory-related cognitive and functional decline in non-demented elderly individuals. The CFIa is a modified version of the original CFI and differs in terms of recall period and item response options. The CFIa is computed as the sum of 14 items, rated on a 5-point Likert scale ranging from Never=0 to Always=4 and referring to the participant's current ability (most recent experience). Total scores range from 0 to 56. Higher scores indicate greater cognitive impairment. Negative change from baseline indicates improvement. The participant (PRO) and study partner (ObsRO) versions of the CFIa were used in this study. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Mean | Standard Deviation | score on a scale | | Baseline to early termination visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change From Baseline in the CFIa Study Partner Version | The CFIa is an outcome measure developed to assess memory-related cognitive and functional decline in non-demented elderly individuals. The CFIa is a modified version of the original CFI and differs in terms of recall period and item response options. The CFIa is computed as the sum of 14 items, rated on a 5-point Likert scale ranging from Never=0 to Always=4 and referring to the participant's current ability (most recent experience). Total scores range from 0 to 56. Higher scores indicate greater cognitive impairment. Negative change from baseline indicates improvement. The PRO and ObsRO versions of the CFIa were used in this study. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Mean | Standard Deviation | score on a scale | | Baseline to early termination visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change From Baseline in the Clinical Dementia Rating Sum of Boxes (CDR-SB) | The CDR is a ClinRO measure used to stage the severity of AD dementia based on a semi-structured interview with the participant and a reliable informant. The CDR characterizes the participant's level of cognitive and functional impairment across six domains (memory, orientation, judgment and problem solving, community affairs, home and hobbies, and personal care) on a 5-point rating scale in which 0 = None, 0.5 = questionable, 1 = mild, 2 = moderate, 3 = severe (with the exception of personal care, which is rated on a 4-point rating scale and excludes the questionable impairment level). The CDR-SB is calculated by summing the ratings across each of the six domains (total score: 0 to 18), with higher scores indicating greater impairment. A negative change from baseline indicates improvement. | ITT Population included all participants randomly assigned to study treatment. Participants were grouped into the two arms (placebo or gantenerumab) according to the treatment assigned at randomization. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Mean | Standard Deviation | score on a scale | | Baseline to early termination visit (up to 225 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Number of Participants With Adverse Events (AEs), Serious Adverse Events (SAEs), and Adverse Events of Special Interest (AESIs) | An AE is any untoward medical occurrence in a patient or clinical study participant temporally associated with the use of a study treatment, whether or not considered related to the study treatment. A SAE is defined as any untoward medical occurrence that, at any dose results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent disability or incapacity, and leads to congenital anomaly or birth defect. An AESI included drug induced liver injury and suspected transmission of infectious agent via medicinal products. | Safety Evaluable Population included all participants randomly assigned to study treatment and who received at least 1 dose of study drug. Participants were grouped according to the treatment they received at first exposure. | Posted | | Count of Participants | | Participants | | Day 1 to safety follow-up visit (up to 310 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Number of Participants With Anti-Drug Antibodies (ADAs) to Gantenerumab | The number of ADA-positive participants after drug administration were determined for participants exposed to gantenerumab. For determining post-baseline incidence, participants were considered to be ADA-positive if they were ADA-negative or had missing data at baseline but developed an ADA response following study drug exposure, or if they were ADA-positive at baseline and the titer of 1 or more post-baseline samples was at least 4-fold higher in comparison to the titer at the baseline. As prespecified in the protocol, this outcome measure was applicable only to participants exposed to gantenerumab. | Safety Evaluable Population included all participants randomly assigned to study treatment and who received at least 1 dose of study drug. Participants were grouped according to the treatment they received at first exposure. | Posted | | Count of Participants | | Participants | | Day 1 to early termination visit (up to 216 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Number of Participants With Magnetic Resonance Imaging (MRI) Findings: Amyloid-related Imaging Abnormalities - Edema/Effusion (ARIA-E) and ARIA-Hemosiderin Deposition (ARIA-H) | ARIA are an identified risk with anti-amyloid antibodies, including gantenerumab. These changes can be identified on brain MRI. In ARIA-E, (E for edema or effusion), edema can be seen in different areas of the brain on MRI, representing fluid leakage into the brain parenchyma or sulcal spaces. ARIA-H (H for hemosiderosis) are small foci of signal loss observed on MRI sequences sensitive for paramagnetic tissue properties and comprise cerebral microbleeds (small foci of bleeding in the brain parenchyma) and leptomeningeal hemosiderosis (small foci of bleeding on the surface of the brain). These changes also occur sporadically in AD. | Safety Evaluable Population included all participants randomly assigned to study treatment and who received at least 1 dose of study drug. Participants were grouped according to the treatment they received at first exposure. | Posted | | Count of Participants | | Participants | | Day 1 to early termination visit (up to 248 days from start of treatment) | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Number of Participants With Injection-site Reactions (ISRs) | An AE is any unfavorable and unintended sign, symptom, or disease temporally associated with the use of an investigational product or other protocol-imposed intervention, regardless of attribution. Local injection reactions (or injection-site reactions) are defined as AEs related to the injection site that occur during or within 24 hours after study drug administration that are judged to be related to the study drug injection. | Safety Evaluable Population included all participants randomly assigned to study treatment and who received at least 1 dose of study drug. Participants were grouped according to the treatment they received at first exposure. | Posted | | Count of Participants | | Participants | | Day 1 to safety follow-up visit (up to 310 days from start of treatment) | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | |
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| Secondary | Number of Participants With Post-baseline Suicidal Behaviors and Ideations as Assessed by Columbia-Suicide Severity Rating Scale (C-SSRS) Score | The C-SSRS is an assessment tool used to assess the lifetime suicidality of a participant (baseline) as well as any new instances of suicidality (since last visit). The structured interview prompts recollection of suicidal ideation (SI), including the intensity of the ideation, behavior, & attempts with actual or potential lethality. Categories have binary responses (yes/no) & include: Wish to be Dead; Non-specific Active Suicidal Thoughts; Active SI with Any Methods (Not Plan) without Intent to Act; Active SI with Some Intent to Act, without Specific Plan; Active SI with Specific Plan & Intent, Preparatory Acts & Behavior; Aborted Attempt; Interrupted Attempt; Actual Attempt (non-fatal); Completed Suicide. SI or behavior is indicated by a "yes" answer to any of the listed categories. A score of 0 is assigned if no suicide risk is present. A score of 1 or higher indicates SI or behavior. Only categories with at least one participant with event are reported. | Safety Evaluable Population included all participants randomly assigned to study treatment and who received at least 1 dose of study drug. Participants were grouped according to the treatment they received at first exposure. Overall number analyzed is the number of participants with data available for analyses. | Posted | | Count of Participants | | Participants | | Day 1 to safety follow-up visit (up to 310 days from start of treatment) | | | | ID | Title | Description |
|---|
| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in Brain Amyloid Load Over Time as Measured by Amyloid Positron Emission Tomography (PET) in a Subset of Participants | Brain amyloid load over time was planned to be assessed using [18F] florbetaben or [18F] flutemetamol tracers. These are PET radioligand selective to amyloid. Amyloid PET burden is measured in a composite region of interest (ROI) by using standardized uptake value ratio (SUVR) mapped to the centiloid scale. The weighted composite target region are composed of (both left and right side): frontal lobe, parietal lobe, temporal lobe lateral, cingulum posterior and anterior cingulate gyrus. The reference region used to normalize the composite region is the whole cerebellum. The centiloid scale anchor points are 0 and 100, where 0 represents a high-certainty amyloid negative scan and 100 represents the amount of global amyloid deposition found in a typical AD scan. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | |
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| Secondary | Change in Brain Tau Load Over Time as Measured by Tau PET in a Subset of Participants | Change in tau load represents how much neurofibrillary tau pathology is present in brain assessed using PET scan. For the longitudinal tau PET assessment, [18F]-MK-6240 was used. Tau load is measured using SUVR in four composite target ROIs: Temporal composite target region included (both left & right) anterior & posterior superior temporal gyrus, posterior temporal lobe, fusiform gyrus, & middle and inferior temporal gyrus; Medial temporal composite region not including hippocampus included (both left & right): amygdala, parahippocampus & anterior medial & lateral temporal lobe; Frontal lobe (both left & right) & Parietal lobe (both left & right). Inferior cerebellar grey matter = reference region for calculating median SUVRs for all four target regions. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 |
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| Secondary | Change in Cerebrospinal Fluid (CSF) Amyloid (A) Peptide Beta (β): Aβ 1-42 Over Time in a Subset of Participants | Amyloid beta is a peptide fragment of the amyloid precursor protein. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in CSF Amyloid Peptide: Aβ 1-40 Over Time in a Subset of Participants | Amyloid beta is a peptide fragment of the amyloid precursor protein. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in CSF Neurofilament Light (NFL) Over Time in a Subset of Participants | NFL is a neuronal cytoplasmic protein highly expressed in large, myelinated axons. Its levels increase in CSF proportionally to the degree of axonal damage in a variety of neurological disorders, including AD. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in CSF Phosphorylated Tau (pTau) Over Time in a Subset of Participants | CSF pTau is an indicator of neuronal injury and neurodegeneration. An elevation in levels specific pTau species, is thought to be a marker for progressive cellular degeneration in AD. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in CSF Total Tau (tTau) Over Time in a Subset of Participants | CSF biomarker tTau has been considered as a general marker of neurodegeneration. An elevation in levels of tau, is thought to be a marker for progressive cellular degeneration in AD. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in Whole Brain Volume Over Time as Determined by MRI in a Subset of Participants | Whole brain volume is measured by volumetric MRI (vMRI). Volumetric imaging is a three dimensional (3D) technique where all the MRI signals are collected from the entire tissue sample and imaged as a whole entity, therefore providing a high signal to noise ratio. Whole brain volume represents a summary measure of total brain parenchyma which includes the cerebrum, basal ganglia, diencephalon, and cerebellum. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in Total Ventricular Volume Over Time as Determined by MRI in a Subset of Participants | Total Ventricular Volume is measured by vMRI. Volumetric imaging is a 3D technique where all the MRI signals are collected from the entire tissue sample and imaged as a whole entity, therefore providing a high signal to noise ratio. Total ventricular volume represents a summary measure of total including right and left lateral ventricles, third ventricle and fourth ventricle of brain. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Secondary | Change in Hippocampal Volume Over Time as Determined by MRI in a Subset of Participants | Total hippocampal volume is measured by vMRI. Volumetric imaging is a 3D technique where all the MRI signals are collected from the entire tissue sample and imaged as a whole entity, therefore providing a high signal to noise ratio. Total hippocampal volume is calculated by summing up right and left hippocampal volumes. | Data is not reported as no postbaseline samples were collected due to early termination of study by the sponsor. | Posted | | | | | | Baseline | | | | ID | Title | Description |
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| OG000 | Placebo | Participants received placebo SC injection for a maximum of 191 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received placebo, SC Q4W six times, and then Q2W six times, prior to reaching the target dose of Q1W. Participants who chose the Q2W dosing regimen received placebo, SC Q4W nine times, prior to reaching the target dose of Q2W. By the time the study was terminated, none of the participants had reached the target dose. | | OG001 | Gantenerumab | Participants received gantenerumab SC injection for a maximum of 172 days. Participants had the option to choose between Q1W or Q2W dosing regimens for the target dose. A gradual up titration was performed. Participants who chose the Q1W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 255 mg SC Q2W six times, prior to reaching the target dose of 255 mg Q1W (i.e., 1020 mg per month). Participants who chose the Q2W dosing regimen received a dose of gantenerumab 120 mg SC Q4W three times, 255 mg SC Q4W three times, and 510 mg SC Q4W three times, prior to reaching the target dose of 510 mg Q2W (i.e., 1020 mg per month). By the time the study was terminated, none of the participants had reached the target dose. |
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| Other Pre-specified | Change in Blood Aβ 1-42 Over Time in All Participants | Amyloid beta is a peptide fragment of the amyloid precursor protein. | | Not Posted | | | | | | Baseline to safety follow-up visit (up to 310 days from start of treatment) | | Participants | | | | |
| Other Pre-specified | Change in Blood Aβ 1-40 Over Time in All Participants | Amyloid beta is a peptide fragment of the amyloid precursor protein. | | Not Posted | | | | | | Baseline to safety follow-up visit (up to 310 days from start of treatment) | | Participants | | | | |
| Other Pre-specified | Change in Blood NFL Over Time in All Participants | NFL is a neuronal cytoplasmic protein highly expressed in large, myelinated axons. Its levels increase in blood proportionally to the degree of axonal damage in AD. | | Not Posted | | | | | | Baseline to safety follow-up visit (up to 310 days from start of treatment) | | Participants | | | | |
| Other Pre-specified | Change in Blood pTau Over Time in All Participants | | | Not Posted | | | | | | Baseline to safety follow-up visit (up to 310 days from start of treatment) | | Participants | | | | |