IMSA101 doses of 1,200 µg (monotherapy arm) and 2,400 µg (combination therapy arm) were well tolerated but demonstrated minimal signals of antitumor activity in patients with advanced solid tumors.
Consistent with this, the use of IL-18 receptor negative CART impair anti-tumor responses in mice receiving combination treatment. In summary, we find that IMSA101 enhances CART function which is facilitated through STING agonist-induced IL-18 secretion.