ABBV-706 / AbbVie - LARVOL DELTA

M24-633: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination with Atezolizumab versus Standard of Care as First-Line Treatment in Participants with Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrialsregister.eu) - P1/2 | N=18 | Not yet recruiting | Sponsor: AbbVie Deutschland GmbH & Co. KG

Adverse events • New P1/2 trial • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A phase II randomized, open-label, multicenter study to evaluate the optimal dose, safety, and efficacy of ABBV-706 in combination with atezolizumab (atezo) versus standard of care (SOC) in patients (pts) with previously untreated extensive-stage (ES) small cell lung cancer (SCLC) (ELCC 2026) - P2 | "Adding a PD-L1 inhibitor (atezo or durvalumab) to PCT only modestly improves survival, and novel therapies are needed...SOC includes 4 cycles of PCT (carboplatin) + etoposide + atezo followed by atezo maintenance; lurbinectedin may also be used in maintenance where locally approved...Treatment continues until progression, intolerable toxicity, or other discontinuation criteria are met. The study is enrolling."

Clinical • Combination therapy • IO biomarker • P2 data • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor • SEZ6

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=180 | Recruiting | Sponsor: AbbVie | N=27 ➔ 180

Adverse events • Enrollment change • Trial initiation date • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=50 | Recruiting | Sponsor: AbbVie | N=27 ➔ 50

Adverse events • Enrollment change • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=27 | Recruiting | Sponsor: AbbVie

Adverse events • New P2 trial • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

Safety and efficacy of ABBV-706, a seizure-related homolog protein 6 (SEZ6)–targeting antibody-drug conjugate, in high-grade neuroendocrine neoplasms. (ASCO 2025) - P1 | "ABBV-706 showed preliminary efficacy in several high-grade NENs with a high unmet need, supporting its further development in specific subtypes."

Clinical • Anemia • CNS Disorders • Endocrine Cancer • Epilepsy • Fatigue • Genito-urinary Cancer • Interstitial Lung Disease • Lung Cancer • Neuroendocrine Tumor • Neutropenia • Oncology • Pneumonia • Prostate Cancer • Pulmonary Disease • Respiratory Diseases • Small Cell Lung Cancer • Solid Tumor • Thrombocytopenia • Thyroid Gland Carcinoma • Thyroid Gland Medullary Carcinoma • SEZ6

Efficacy of ABBV-706, a SEZ6-targeted topoisomerase 1 inhibitor ADC: A report from the Pediatric Preclinical In Vivo Testing (PIVOT) Program (AACR 2026) - P1 | "We showed high anti-tumor activity for ABBV-706 in multiple SEZ6 expressing models and enhanced efficacy versus IC-ADC. Due to high expression of SEZ6 in several pediatric histologies, ABBV-706 has potential for clinical activity in patients with these cancers.*indicates p-value <0.05 compared to matched IC-ADC"

ADC • IO biomarker • Preclinical • Brain Cancer • Eye Cancer • Hematological Malignancies • Medulloblastoma • Neuroblastoma • Oncology • Retinoblastoma • Rhabdomyosarcoma • Sarcoma • Solid Tumor • PD-1 • SEZ6

Preclinical assessment of HWK-206, a next-generation, biparatopic, SEZ6-targeting ADC with novel bioconjugation and linker-payload technology (AACR 2026) - "Single-epitope, SEZ6-directed antibody-drug conjugates (ADCs), such as ABBV-706, have shown initial promise in SCLC and NE neoplasms, but with some potential challenges attributed to side effects associated with these agents. In summary, HWK-206 is a highly potent and selective next-generation, biparatopic, SEZ6-targeted ADC that warrants further investigation. A planned phase I dose-escalation study will investigate HWK-206 in patients with advanced solid tumors."

ADC • Preclinical • Bladder Cancer • Brain Cancer • CNS Tumor • Lung Cancer • Neuroendocrine Tumor • Oncology • Prostate Cancer • Small Cell Lung Cancer • Solid Tumor • SEZ6

Safety and Efficacy of ABBV-706, a Seizure-related Homolog Protein 6-targeting Antibody-drug Conjugate, in R/R SCLC (IASLC-WCLC 2025) - P1 | "ABBV-706 has manageable safety and promising efficacy in patients with R/R SCLC. Based on the totality of the benefit-risk profile, monotherapy RP2D was determined to be 1.8 mg/kg Q3W in SCLC."

Clinical • Anemia • CNS Disorders • Epilepsy • Fatigue • Interstitial Lung Disease • Lung Cancer • Pulmonary Disease • Respiratory Diseases • Small Cell Lung Cancer • Solid Tumor • SEZ6

A Study to Evaluate Adverse Events and Change in Disease Activity of Intravenous ABBV-706 Versus Standard of Care in Adult Participants With Relapsed/Refractory Small Cell Lung Cancer (clinicaltrials.gov) - P3 | N=531 | Not yet recruiting | Sponsor: AbbVie

Adverse events • New P3 trial • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

ABBV-706: Initiation of P3 trial for SCLC in 2026 (AbbVie, 44th Annual J.P. Morgan Healthcare Conference)

New P3 trial • Lung Cancer • Oncology • Small Cell Lung Cancer

ABBV-706: Initiation of P3 trial for SCLC in 2026 (AbbVie, 44th Annual J.P. Morgan Healthcare Conference)

New P3 trial • Lung Cancer • Oncology • Small Cell Lung Cancer

First-in-human study of ABBV-706, a seizure-related homolog protein 6 (SEZ6)–targeting antibody-drug conjugate (ADC), in patients (pts) with advanced solid tumors. (ASCO 2024) - P1 | " Phase 1, open-label, multicenter, DE and dose-expansion study (NCT05599984) of ABBV-706 as monotherapy or in combination with budigalimab (a programmed cell death 1 inhibitor), carboplatin, or cisplatin. ABBV-706 demonstrated a manageable safety profile with promising efficacy in SCLC and NENs. Further evaluation of ABBV-706 is ongoing."

Clinical • Metastases • P1 data • Anemia • Brain Cancer • CNS Disorders • CNS Tumor • Endocrine Cancer • Epilepsy • Fatigue • Gastrointestinal Disorder • Glioma • Hematological Disorders • Interstitial Lung Disease • Leukopenia • Lung Cancer • Neuroendocrine Tumor • Neutropenia • Oncology • Pneumonia • Pulmonary Disease • Respiratory Diseases • Small Cell Lung Cancer • Solid Tumor • Thrombocytopenia • SEZ6

Expanded Access to ABBV-706 (clinicaltrials.gov) - P=N/A | N=0 | Available | Sponsor: AbbVie

New trial • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=180 | Recruiting | Sponsor: AbbVie | Trial completion date: Sep 2031 ➔ May 2029

Adverse events • Trial completion date • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=180 | Recruiting | Sponsor: AbbVie | Trial completion date: May 2029 ➔ Sep 2031

Adverse events • Trial completion date • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2 | N=180 | Recruiting | Sponsor: AbbVie | Not yet recruiting ➔ Recruiting | Phase classification: P2/3 ➔ P2

Adverse events • Enrollment open • Phase classification • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2/3 | N=180 | Not yet recruiting | Sponsor: AbbVie | Trial completion date: May 2029 ➔ Sep 2031

Adverse events • Trial completion date • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2/3 | N=180 | Not yet recruiting | Sponsor: AbbVie | N=730 ➔ 180 | Trial completion date: Sep 2031 ➔ May 2029 | Trial primary completion date: Sep 2031 ➔ May 2029

Adverse events • Enrollment change • Trial completion date • Trial primary completion date • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor

Efficacy of ABBV-706 as second-line treatment for patients with platinum-refractory/resistant small cell lung cancer (ESMO 2025) - P1 | "Background First-line (1L) standard of care (SOC) for extensive-stage small cell lung cancer (SCLC) includes platinum chemotherapy + etoposide (PE), with a PD-L1 inhibitor...Cross-trial comparison showed that ABBV-706 had improved efficacy (ORR, DOR, and PFS) compared with approved 2L agents lurbinectedin and topotecan...Given the antitumor effect observed in PDX models and improved outcomes in PE-resistant pts from NCT05599984, ABBV-706 has the potential to replace 1L SOC in SCLC. Table: 2777P Efficacy observed in NCT05599984 Clinical trial pts N=80 1.8 mg/kg n=41 2.5 mg/kg n=39 CTFI <30 days n=19 CTFI <90 days n=41 ORR, % (n/N) 56 (23/41) 59 (23/39) 53 (10/19) 59 (24/41) mDOR, months [95% CI] 6.2 [4.2, NE] 4.4 [3.5, 6.9] 5.7 [2.8, NE] 5.6 [3.2, 6.9] Median PFS-706, months [95% CI] 6.8 [4.0, 8.2] 5.6 [4.4, 7.0] 5.7 [3.9, 7.5] 5.7 [4.2, 7.0] Median PFS-L1, months [95% CI] 6.1 [4.6, 8.8] 6.5 [4.8, 8.4] 4.0 [3.0, 6.0] 4.4 [4.2, 5.5] CTFI, chemotherapy-free..."

Clinical • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor • SEZ6

M23-385: Study to Evaluate Adverse Events, Change in Disease Activity, and How ABBV-706 Moves Through the Body When Intravenously (IV) Infused Alone or in Combination With IV Infused Budigalimab, Cisplatin, or Carboplatin in Adult Participants With Advanced Solid Tumors (clinicaltrials.gov) - P1 | N=288 | Active, not recruiting | Sponsor: AbbVie | Recruiting ➔ Active, not recruiting

Adverse events • Enrollment closed • First-in-human • Monotherapy • Brain Cancer • Glioblastoma • Lung Cancer • Non Small Cell Lung Cancer • Oligodendroglioma • Oncology • Prostate Cancer • Small Cell Lung Cancer • Solid Tumor • EGFR • SEZ6

ABBV-706, a seizure-related homolog protein 6 (SEZ6)-targeting antibody-drug conjugate (ADC), in patients (pts) with relapsed/refractory (R/R) small cell lung cancer (SCLC): Circulating biomarker and molecular response analyses (ESMO 2025) - P1 | "Table: 2778P ctDNA methylation-based molecular response Analysis set,* % (n) RECIST responders, % (n) Methyl cTF reduction from baseline Methyl cTF reduction from baseline 50% 100% 50% 100% 1.8 mg/kg 92 (22/24) 50 (12/24) 100 (14/14) 71 (10/14) 2.5 mg/kg 94 (17/18) 61 (11/18) 100 (13/13) 69 (9/13) *Pts with ctDNA at relevant time point C3D1, from 3 January 2025 data cutoff were included in this analysis. cTF, circulating tumor fraction."

Biomarker • Clinical • IO biomarker • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor • CTCs • SEZ6

Seizure related 6 homolog (SEZ6) expression pattern and prognostic impact in a real-world cohort of patients with small cell lung cancer (ESMO 2025) - "ABBV-706, is a first-in-class antibody-drug conjugate composed of a potent topoisomerase 1 inhibitor attached via a stable linker to a SEZ6-directed monoclonal antibody, delivering the cytotoxic payload specifically to SEZ6-expressing tumour cells, under investigation for patients with advanced solid tumors, including SCLC...Legal entity responsible for the study AbbVie, Inc. Funding AbbVie, Inc."

Clinical • IO biomarker • Real-world • Real-world evidence • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor • ASCL1 • CD276 • DLL3 • NEUROD1 • POU2F3 • SEZ6

AbbVie will also present new analysis from a Phase 1 study of ABBV-706, a SEZ6-directed ADC with a Top1i payload, in relapsed/refractory small cell lung cancer (R/R SCLC) (NCT05599984). (AbbVie Press Release) - "A post hoc analysis on data from R/R SCLC patients enrolled in the study, whose tumors had progressed after two lines of therapy (n=80), was done to compare the anti-cancer effect of ABBV-706 monotherapy vs. platinum-based SOC. All patients in this group had received the platinum-based SOC treatment as first-line therapy (1L SOC)...The findings suggest that ABBV-706 may have the potential to replace the platinum-based SOC as a first-line treatment in SCLC....ABBV-706 treatment also resulted in rapid clearance of circulating tumor DNA (ctDNA) and circulating tumor cells (CTC). Patients with 100% ctDNA clearance had significantly higher PFS and overall survival (OS) vs. patients without ctDNA clearance."

P1 data • Small Cell Lung Cancer

SEZanne: A Study to Evaluate the Optimal Dose, Adverse Events and Change in Disease Activity of Intravenous ABBV-706 in Combination With Atezolizumab Versus Standard of Care as First-Line Treatment in Adult Participants With Previously Untreated Extensive Stage Small Cell Lung Cancer (clinicaltrials.gov) - P2/3 | N=730 | Not yet recruiting | Sponsor: AbbVie

Adverse events • New P2/3 trial • Lung Cancer • Oncology • Small Cell Lung Cancer • Solid Tumor