A Study of BI-1206 in Combination with Pembrolizumab in Subjects with Advanced Solid Tumors (KEYNOTE-A04)

Inclusion Criteria:

• Is willing and able to provide written informed consent for the trial.

• Is ≥18 years of age on day of signing informed consent.

• Has a histologically confirmed advanced solid tumor. Subjects must have received atleast 2 doses of an approved anti- PD-1/L1 mAb, and have documented progression onor within 12 weeks from the last dose of anti-PD-1/L1 mAb.

• Is intolerant of, refuses, or is not eligible for standard antineoplastic therapy.

• Has at least 1 measurable disease lesion as defined by Response Evaluation Criteriain Solid Tumors.

• Is able to safely undergo a baseline tumor tissue biopsy prior to first dose ofBI-1206.

• Has a life expectancy of ≥12 weeks.

• Has an ECOG performance status of 0-1.

• Has adequate organ function as confirmed by laboratory values listed in the mainbody of the protocol Expansion Cohort

Specific Inclusion Criteria:

In addition to the general inclusion criteria above, subjects must also meet the criteria for the specific cohort.

Cohort 1 (Non-small cell lung cancer):

• For subjects whose tumor has PD-L1 ≥ 50%: Required prior therapies will includeanti-PD-1 therapy as monotherapy. Prior standard of care chemotherapy will beallowed but not required.

• For tumors with unknown PD-L1 or PD-L1 < 50% , required prior therapies will includeanti-PD 1/PD-L1 therapy and SOC chemotherapy either combined with anti PD-1/PD-L1therapy or given separately.

• For subjects with known anaplastic lymphoma kinase, ROS1 or epidermal growth factorreceptor (EGFR) sensitizing molecular rearrangements or with BRAF mutations, oneline of targeted therapy will be required in addition to anti-PD1/ PD-L1 therapy.

Cohort 2 (Metastatic Melanoma):

• Required prior therapies will include anti-PD-1 therapy either as monotherapy or aspart of a combination regimen.

• For subjects with a known BRAF V600-activating mutation combination targeted therapywill be required in addition to anti-PD-1/PD-L1 therapy.

Cohort 3 (Other Tumor Types):

• All subjects will require prior anti-PD-1/PD-L1 therapy.

Exclusion Criteria:

• Needs doses of prednisolone >10 mg daily (or equipotent doses of othercorticosteroids).

• Has known active central nervous system (CNS) metastases and/or carcinomatousmeningitis.

• Has known or suspected hypersensitivity to pembrolizumab or BI-1206 or any of theirexcipients.

• Has cardiac or renal amyloid light-chain (AL) amyloidosis.

• Has received the following:

• Chemotherapy or small molecule products within 4 weeks of first dose of BI

• Radiotherapy within 2 weeks of first dose of BI-1206. A 1-week washout ispermitted for palliative radiation (≤2 weeks of radiotherapy) for non-CNSdisease. Subjects who have previously had radiation pneumonitis are notallowed.

• Immunotherapy within 4 weeks prior to the first dose of BI-1206.

• Has not recovered from AEs to at least Grade 1 by Common Terminology Criteria forAdverse Events v5.0 due to prior anti-cancer therapies.

• Has had Grade ≥3 autoimmune manifestations of previous immune checkpoint inhibitortreatments .

• Has a history of (non-infectious) pneumonitis that required steroids or has currentpneumonitis.

• Has an active, known or suspected autoimmune disease.

• Is a female subject and has the ability to become pregnant (or already pregnant orlactating/ breastfeeding).

• Is a male subject with partner(s) of child-bearing potential.

• Has had major surgery from which the subject has not yet recovered.

• Is at high medical risk because of non-malignant systemic disease including severeactive infections on treatment with antibiotics, antifungals or antivirals.

• Has presence of chronic graft versus host disease.

• Has had an allogenic tissue/solid organ transplant.

• Has known human immunodeficiency virus (HIV) and / or history of hepatitis B or Cinfections, or has a positive test for HIV antibody, hepatitis B antigen / hepatitisB virus DNA or hepatitis C antibody or RNA.

• Has a history of active tuberculosis (bacillus tuberculosis).

• Has received a live vaccine within 30 days before the first dose of study treatment.

• Has uncontrolled or significant cardiovascular disease.

• Has a known psychiatric or substance abuse disorder that would interfere with thesubject's ability to cooperate with the requirements of the study.

• Has a history or current evidence of any condition, therapy, or laboratoryabnormality that might confound the results of the study, interfere with thesubject's participation for the full duration of the study, or is not in the bestinterest of the subject to participate, in the opinion of the treating investigator.

• Is participating or planning to participate in another interventional clinicaltrial, or has participated in a trial of an investigational agent or has used aninvestigational device within 4 weeks prior to first dose of study drug. Subjectswho have entered the follow-up phase of an investigational study may participate aslong as it has been 4 weeks after the last dose of the previous investigationalagent. Participation in an observational trial is acceptable.

• Has a known additional malignancy of another type.

• Has a diagnosis of primary or acquired immunodeficiency disorder or taking any otherform of immunosuppressive therapy within 7 days prior the first dose of study drug.