For the nine months ended September 30, 2023, the decrease in mupadolimab costs of $9.3 million as compared to the nine months ended September 30, 2022, primarily consisted of a decrease of $7.7 million in drug manufacturing costs, a decrease of $1.3 million in clinical trial expenses and a decrease of $0.3 million in other outside service costs as a result of pausing development of this product candidate.
For the three months ended September 30, 2023, the decrease in unallocated costs of $0.3 million as compared to the three months ended September 30, 2022, primarily consisted of a decrease in personnel and related costs.
For the nine months ended September 30, 2023, the decrease in unallocated costs of $0.1 million as compared to the nine months ended September 30, 2022, primarily consisted of a decrease of $0.6 million in personnel and related costs, which was partially offset by an increase of $0.5 million in other outside costs.
General and Administrative Expense
For the three months ended September 30, 2023, the decrease in general and administrative expenses of $0.5 million as compared to the three months ended September 30, 2022, primarily consisted of a decrease of $0.1 million in personnel and related costs and a decrease of $0.4 million in outside costs.
For the nine months ended September 30, 2023, the decrease in general and administrative expenses of $1.3 million as compared to the nine months ended September 30, 2022, primarily consisted of a decrease of $0.6 million in personnel and related costs and a decrease of $0.7 million in outside costs.
Interest Income and Other Expense, net
For the three months ended September 30, 2023, the increase in interest income and other expense, net of $0.2 million as compared to the three months ended September 30, 2022, primarily consisted of an increase in interest income earned due to an increase in interest rates.
For the nine months ended September 30, 2023, the increase in interest income and other expense, net of $0.9 million as compared to the nine months ended September 30, 2022, primarily consisted of an increase in interest income earned due to an increase in interest rates.
Sublease Income – Related Party
For the three months ended September 30, 2023, the decrease in sublease income of $0.1 million was due to the expiration of the building sublease agreement with Angel Pharmaceuticals in January 2023.
For the nine months ended September 30, 2023, the decrease in sublease income of $0.4 million was due to the expiration of the building sublease agreement with Angel Pharmaceuticals in January 2023.
Loss from equity method investment
For the three months ended September 30, 2023, the decrease in loss from equity method investment of $1.9 million as compared to the three months ended September 30, 2022, primarily consisted of a decrease in Angel Pharmaceuticals’ loss for the three months ended September 30, 2023.
For the nine months ended September 30, 2023, the decrease in loss from equity method investment of $1.5 million as compared to the nine months ended September 30, 2022, primarily consisted of a decrease in Angel Pharmaceuticals’ loss for the nine months ended September 30, 2023.