For the three months ended September 30, 2022, the decrease in ciforadenant costs of $0.1 million as compared to the three months ended September 30, 2021, primarily consisted of a decrease of $0.2 million in clinical trial expenses, which were partially offset by an increase of $0.1 million in other outside service costs.
For the nine months ended September 30, 2022, the decrease in ciforadenant costs of $0.1 million as compared to the nine months ended September 30, 2021, primarily consisted of a decrease of $0.5 million in clinical trial expenses, which were partially offset by an increase of $0.3 million in drug manufacturing costs and an increase of $0.1 million in other outside service costs.
For the three months ended September 30, 2022, the increase in mupadolimab costs of $3.3 million as compared to the three months ended September 30, 2021, primarily consisted of an increase of $5.4 million in drug manufacturing costs as a result of the purchase of antibody for our clinical trial for mupadolimab, which was subsequently paused, under a non-cancelable purchase commitment, which were partially offset by a decrease of $1.9 million in clinical trial expenses and a decrease of $0.2 million in other outside service costs.
For the nine months ended September 30, 2022, the decrease in mupadolimab costs of $2.4 million as compared to the nine months ended September 30, 2021, primarily consisted of a decrease of $7.6 million in clinical trial expenses, a decrease of $0.4 million in licensing expense and a decrease of $0.5 million in other outside service costs, which were partially offset by an increase of $6.1 million in drug manufacturing costs as a result of the purchase of antibody for our clinical trial for mupadolimab, which was subsequently paused, under a non-cancelable purchase commitment.
For the three months ended September 30, 2022, the decrease in unallocated costs of $0.1 million as compared to the three months ended September 30, 2021, primarily consisted of a decrease of $0.3 million in personnel and related costs, which were partially offset by an increase of $0.2 million in other outside service costs.
For the nine months ended September 30, 2022, the decrease in unallocated costs of $2.3 million as compared to the nine months ended September 30, 2021, primarily consisted of a decrease of $2.3 million in personnel and related costs and a decrease of $0.3 million in facility related expenses, which were partially offset by an increase of $0.3 million in other outside service costs.
General and Administrative Expense
For the three months ended September 30, 2022, the increase in general and administrative expenses of $0.1 million as compared to the three months ended September 30, 2021, primarily consisted of an increase of $0.4 million in professional service costs, which were partially offset by a decrease of $0.3 million in personnel and related costs.
For the nine months ended September 30, 2022, the decrease in general and administrative expenses of $1.0 million as compared to the nine months ended September 30, 2021, primarily consisted of a decrease of $1.2 million in personnel and related costs, which were partially offset by an increase of $0.2 million in professional service costs.
Interest Income and Other Expense, net
For the three months ended September 30, 2022, the increase in interest income and other expense, net of $0.2 million as compared to the three months ended September 30, 2021, primarily consisted of additional interest income earned due to a higher rate of return on investments.
For the nine months ended September 30, 2022, the increase in interest income and other expense, net of $0.3 million as compared to the nine months ended September 30, 2021, primarily consisted of additional interest income earned due to a higher rate of return on investments.
Sublease Income – Related Party
For the three and nine months ended September 30, 2022, sublease income of $0.1 million and $0.4 million, respectively, represents rental income associated with our building sublease to Angel Pharmaceuticals.