Shares of SKB BIO-B (06990) and HBM HOLDINGS-B (02142) rose in morning trading. At the time of writing, SKB BIO-B was up 8.95%, trading at HK$414, while HBM HOLDINGS-B advanced 4.26% to HK$12. The gains followed news that on March 9, the CDE website indicated that the SKB575 (HBM7575) injection, jointly submitted by SKB BIO-B and HBM HOLDINGS-B, had received clinical trial approval for the treatment of atopic dermatitis. This marks the first bispecific antibody from the partners’ autoimmune disease collaboration pipeline to enter the clinical stage. It is reported that HBM7575/SKB575 targets thymic stromal lymphopoietin (TSLP) and an undisclosed target, featuring a dual mechanism of action. On one hand, it inhibits TSLP-mediated signaling pathways and the activation of Th2 immune cells by blocking the interaction between TSLP and its receptor. On the other hand, its binding and blocking of the other undisclosed target is expected to produce a synergistic effect, overcoming resistance issues associated with single-target TSLP antibodies.