for people ages 18 years and up (full criteria)
at UC Irvine
study started
estimated completion



An open-label, dose-escalation (Part 1), dose-expansion (Part 2) study to assess the safety, pharmacokinetics (PK), and preliminary efficacy of ABBV-155 alone and in combination with paclitaxel or docetaxel. In Part 1 (dose escalation), participants will receive escalating doses of ABBV-155 monotherapy (Part 1a) or ABBV-155 in combination with paclitaxel or docetaxel (Part 1b). In Part 2 (dose expansion), participants will receive ABBV-155 monotherapy or in combination therapy. The ABBV-155 monotherapy cohort will enroll participants with relapsed or refractory (R/R) small cell lung cancer (SCLC) (Part 2a); the ABBV-155 plus a taxane (paclitaxel or docetaxel) combination cohort will enroll participants with R/R non-small cell lung cancer (NSCLC) and breast cancer (Part 2b).

Official Title

A Phase 1 First-in-Human Study With ABBV-155 Alone and in Combination With Taxane Therapy in Adults With Relapsed and/or Refractory Solid Tumors


Advanced Solid Tumors Cancer Relapsed and/or Refractory Solid Tumors ABBV-155 Taxane Paclitaxel Docetaxel breast cancer non-small cell lung cancer (NSCLC) small cell lung cancer (SCLC) Neoplasms Escalation 1a: ABBV-155 Expansion 2a: ABBV-155 in SCLC Expansion 2b: ABBV-155 + paclitaxel in Breast Cancer Expansion 2b: ABBV-155 + docetaxel in NSCLC


You can join if…

Open to people ages 18 years and up

  • Has a histologic or cytologic diagnosis of a malignant solid tumor.
  • Participants enrolled in Part 2a (monotherapy, dose expansion) must have small cell lung cancer (SCLC) with tumors that express B7H3 above a given threshold per central laboratory testing; participants enrolled to Part 2b (combination therapy, dose expansion) must have either NSCLC or HR-positive/HER2-negative breast cancer with tumors that express B7H3 above a given threshold per central laboratory testing.
  • Measurable disease defined by Response Evaluation Criteria in Solid Tumors (RECIST) criteria.
  • An Eastern Cooperative Oncology Group (ECOG) performance status less than or equal to
  • Failure of at least 1 prior systemic chemotherapy including all available standard therapies for participants in the dose-escalation phase (Parts 1a and 1b).
  • All participants with breast cancer for subjects in the dose-expansion phase (Part 2b only) must have the following:
  • locally advanced or metastatic HR-positive/HER2-negative breast cancer after failing cyclin-dependent kinase (CDK)4/6 inhibitor-based therapy.
  • HR-positivity and HER-2-negativity should be confirmed based on American Society of Clinical Oncology (ASCO)/College of American Pathologists (CAP) criteria.
  • All participants with non-small cell lung cancer (NSCLC) for participants in the dose-expansion phase (Part 2b only) must have R/R NSCLC after at least 1 line of therapy.
  • All participants with SCLC in the dose-expansion phase (Part 2a only) must have R/R SCLC from at least 1 line of therapy which includes a platinum-based therapy with or without an anti-PD-1/PD-L1 therapy.
  • All participants with either breast cancer or NSCLC must have the following if exposed to prior taxane-based therapy: no history of taxane allergy (Part 1b and Part 2b only); and disease that has relapsed or progressed at least 2 months after most recent exposure to any taxane-based therapy.
  • Available tumor tissue suitable for immunohistochemistry testing.
  • Adequate kidney, liver, and hematologic laboratory values as described in the protocol.

You CAN'T join if...

  • Untreated brain or meningeal metastases (participants with a history of metastases may be eligible based on details described in the protocol).
  • Grade 2 or higher peripheral neuropathy (only applies to participants who would receive taxane therapy).
  • Unresolved Grade 2 or higher toxicities related to previous anticancer therapy except alopecia.
  • Known active infection of hepatitis B, hepatitis C, or human immunodeficiency virus with exceptions as described in the protocol.
  • Recent history (within 6 months) of congestive heart failure (defined in the protocol), ischemic cardiovascular event, cardiac arrhythmia requiring pharmacological or surgical intervention, pericardial effusion, or pericarditis.
  • Any history of hypersensitivity to any ingredients of ABBV-155 will be excluded. For combination therapy only (Parts 1b and 2b), no history of serious allergic reaction to any taxane or any ingredients used in taxane formulation (e.g., cremaphor).


  • UC Irvine Medical Center - Chao Family Comprehensive Cancer Center /ID# 206105 accepting new patients
    Orange California 92868-3201 United States
  • Cedars-Sinai Medical Center-West Hollywood /ID# 204267 accepting new patients
    West Hollywood California 90048 United States


accepting new patients
Start Date
Completion Date
Phase 1
Study Type
Last Updated