ABBV-011

SEZ6 may serve as a novel biomarker for MTCs. Although SEZ6 lacks any prognostic values in MTC, its positivity in 91% to 93% of MTCs, including MTCs without RET and RAS mutations, renders SEZ6-targetted antibody-drug conjugate therapy a promising targeted therapy for MTCs.

ABBV-011 1.0 mg/kg Q3W monotherapy was well tolerated and demonstrated encouraging antitumor activity in heavily pretreated patients with relapsed/refractory SCLC. SEZ6 is a promising novel SCLC target and warrants further investigation.

Although toxicities exceeding expectations have been observed with Rova-T, drugs targeting TROP-2 (Sacituzumab Govitecan), B7-H3 (DS-7300), and SEZ6 (ABBV-011) have shown exciting clinical benefits. In this review, we collect the latest clinical evidence to describe the therapeutic efficacy and safety of ADCs in SCLC and discuss prospects and challenges.

P1, N=132, Completed, AbbVie | Active, not recruiting --> Completed

Significance Statement Several in vitro and in vivo stability studies of ABBV-011, a calicheamicin-based ADC, identified circulating metabolites and catabolites and suggested that disulfide cleavage may be a key liability for the conjugated linker-payload. These observations may be relevant to other disulfide-linked ADCs, such as Mylotarg and Besponsa, both of which have reported similar half-lives that possibly indicate instability.

P1, N=45, Completed, Guangzhou JOYO Pharma Co., Ltd

P2/3, N=210, Recruiting, Guangzhou JOYO Pharma Co., Ltd

P1, N=132, Active, not recruiting, AbbVie | Recruiting --> Active, not recruiting | N=233 --> 132