For the three months ended June 30, 2023, the decrease in ciforadenant costs of $0.1 million as compared to the three months ended June 30, 2022, primarily consisted of a decrease of $0.2 million in drug manufacturing costs, which were partially offset by an increase of $0.1 million in clinical trial expenses.
For the six months ended June 30, 2023, the decrease in ciforadenant costs of $0.4 million as compared to the six months ended June 30, 2022, primarily consisted of a decrease of $0.3 million in drug manufacturing costs and a decrease of $0.1 million in other outside service costs.
For the three months ended June 30, 2023, the decrease in mupadolimab costs of $1.2 million as compared to the three months ended June 30, 2022, primarily consisted of a decrease of $0.9 million in drug manufacturing costs and a decrease of $0.3 million in clinical trial expenses as a result of pausing development of this product candidate.
For the six months ended June 30, 2023, the decrease in mupadolimab costs of $2.8 million as compared to the six months ended June 30, 2022, primarily consisted of a decrease of $1.5 million in drug manufacturing costs, a decrease of $1.1 million in clinical trial expenses and a decrease of $0.2 million in other outside service costs as a result of pausing development of this product candidate.
For the three months ended June 30, 2023, the increase in unallocated costs of less than $0.1 million as compared to the three months ended June 30, 2022, primarily consisted of an increase of $0.2 million in outside service costs, which were partially offset by a decrease of $0.2 million in personnel and related costs.
For the six months ended June 30, 2023, the increase in unallocated costs of $0.2 million as compared to the six months ended June 30, 2022, primarily consisted of an increase of $0.4 million in outside costs, which were partially offset by a decrease of $0.2 million in personnel and related costs.
General and Administrative Expense
For the three months ended June 30, 2023, the decrease in general and administrative expenses of $0.4 million as compared to the three months ended June 30, 2022, primarily consisted of a decrease of $0.2 million in personnel and related costs and an decrease of $0.2 million in outside costs.
For the six months ended June 30, 2023, the decrease in general and administrative expenses of $0.8 million as compared to the six months ended June 30, 2022, primarily consisted of a decrease of $0.5 million in personnel and related costs and a decrease of $0.3 million in outside costs.
Interest Income and Other Expense, net
For the three months ended June 30, 2023, the increase in interest income and other expense, net of $0.3 million as compared to the three months ended June 30, 2022, primarily consisted of an increase in interest income earned due to an increase in interest rates.
For the six months ended June 30, 2023, the increase in interest income and other expense, net of $0.7 million as compared to the six months ended June 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 June 30, 2023, the decrease in sublease income of less than $0.1 million was due to the expiration of the building sublease agreement with Angel Pharmaceuticals in January 2023.
For the six months ended June 30, 2023, the decrease in sublease income of $0.2 million was due to the expiration of the building sublease agreement with Angel Pharmaceuticals in January 2023.