The study is a multicenter, Phase Ib/IIa, open-label, dose-escalation study to evaluate the safety and tolerability of orally administered KAND567 in combination with carboplatin therapy, and to determine the Recommended Phase II Dose (RPIID) of KAND567 in combination with carboplatin in subjects with recurrent platinum-resistant epithelial ovarian, fallopian tube, or primary peritoneal cancer.

In Part 1, dose escalation will be based on the recommendation of the Safety Review Committee (SRC) after review of the emerging safety and tolerability information. The SRC is also mandated to modify the dose levels within the dose range (125 to 625 mg BID), as well as the schedule to maintain subject safety and best serve the objectives of the study. Once the RPIID has been identified in Part 1, the SRC may recommend to the Sponsor to start Part 2.

An expansion cohort will be enrolled in Part 2 of the study to further evaluate the RPIID (approximately 20 subjects; may range from 6 to 24 subjects, depending on Part 1). If the number of subjects with confirmed CX3CR1 expression in tumor cells is below 50%, an additional 15 subjects may be included in Part 2 of the study.

Inclusion Criteria:

• Histologically verified high-grade serous or high-grade endometrioid epithelial ovarian cancer, fallopian tube, or primary peritoneal cancer

• Participants* must have recurrent disease, defined as: 1st relapse 3 to 6 months after completion of the last dose of primary platinum containing treatment, or 2nd or 3rd relapse within 6 months after completion of the last dose of the latest platinum-containing regimen (platinum-free interval within 6 months)

  *Prior treatment with PARPi is allowed. In bevacizumab-naive patients, bevacizumab can be included as part of treatment after tumor progression on study drugs according to local clinical practice

• Participants must have had platinum-based chemotherapy in the first-line setting (at primary treatment or 1st relapse requiring chemotherapy)

• For BRCA status, samples must be available for analysis; for HRD status, samples should be available for analysis, if possible. If not already analyzed, the subject agrees to undergo analysis of HRD and BRCA status on primary tumor tissue and/or recurrent tumor tissue

• ECOG performance status 0-2

• Subjects must have at least 1 measurable disease according to RECIST 1.1 guidelines. Non-measurable disease must be evaluable using GCIG CA 125 criteria (CA 125 ≥ 2 x upper limit of normal [ULN]). If the subject has only 1 measurable lesion, this should not be the same lesion used for biopsy, nor should it be in a previously irradiated area.

• Able to take oral medications

• Adequate organ function: Absolute neutrophil count ≥ 1.5 x 10^9/L, Platelets > 100 x 10^9/L, Hemoglobin ≥ 80 g/dl, Serum creatinine ≤ 1.5 x ULN or calculated creatinine clearance ≥ 50 mL/min using the Cockcroft-Gault formula, Total bilirubin ≤ ULN, Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ ULN

• Consent to biopsy taken prior to starting treatment and Week 8 (± 1 week) of treatment

• At least 18 years of age

• Life expectancy of at least 12 weeks

• Women of childbearing potential must use adequate birth control for the study duration and 6 months afterwards. She must use contraceptive methods with a failure rate of < 1% to prevent pregnancy* and drug exposure of a partner. Male partners must refrain from donating sperm from their partner's first IMP dose until 6 months after their partner's last IMP dose.

  * Combined (estrogen- and progesterone-containing) hormonal contraception associated with inhibition of ovulation (oral, intravaginal, transdermal); progestogen-only hormonal contraception associated with inhibition of ovulation (oral, injectable, implantable); intrauterine device (IUD) or intrauterine hormone-releasing system (IUS); bilateral tubal occlusion, vasectomy, and sexual abstinence.

• Willingness and ability to comply with study procedures, visit schedules, study restrictions and requirements

• Able to fully understand and participate in study-related procedures, including compliance and patient reported outcome

• Written informed consent. Subjects must give informed consent prior to any study-specific procedure

Exclusion Criteria:

• Ovarian sarcomas, small cell carcinoma with neuroendocrine differentiation, non-epithelial cancers, and cancer types not mentioned in the inclusion criteria
• Primary platinum-refractory disease, defined as tumor progression during or within 12 weeks from end of first platinum treatment
• Concurrent cancer therapy (including anti-hormonal therapy for breast cancer unless it is omitted at the latest at study enrollment).
• Received other than platinum-containing therapy for primary disease (first-line treatment)
• Received non-platinum-containing chemotherapy line (e.g. weekly paclitaxel) in treatment of recurrent ovarian cancer. Maintenance with bevacizumab and/or PARP-inhibitor is allowed.
• Treatment with an investigational agent concurrently, or where the last dose was administered within 5 elimination half-lives or where pharmacological activity may still be present as assessed by the Investigator.
• Previous malignant disease: subjects are not eligible for the study if actively being treated for invasive cancer other than ovarian cancer. Subjects with previous malignant disease other than ovarian cancer who are relapse-free and treatment-free for more than three years may enter this study (exception: anti-hormonal therapy, which must be omitted at the latest at study enrollment). Subjects with previous history of in situ carcinoma, stage 1A cervical cancer or non-invasive basal cell and squamous cell skin carcinoma can enter this trial.
• Immunodeficiency or organ transplant. Autoimmune or inflammatory condition that requires immunosuppressive or steroid therapy during the course of the study. Subjects using immunosuppressive medications within 14 days prior to the first IMP dose, except for topical medications (intranasal, inhaled, local injection, systemic [prednisolone equivalent 10 mg/day or less]) or as needed for hypersensitivity reactions such as CT scan premedication.
• Live vaccines within 28 days prior to the first IMP dose
• Major surgery within 28 days prior to the first IMP dose, or not recovered from previous surgery to CTCAE (v5) grade 1 equivalent
• Active infection including hepatitis B, hepatitis C, or human immunodeficiency virus (HIV)
• Transient ischemic attack (TIA) or stroke, including bleeding, within the past 6 months
• Brain metastases
• Major cardiac dysfunction defined as > NYHA II
• Gastrointestinal disorders or abnormalities that would interfere with absorption of the study drug
• Serious, uncontrolled, and active infection at enrollment, as determined by the Investigator
• Pregnancy or breastfeeding
• Persistence of clinically relevant therapy-related toxicity from previous chemotherapy (≥ CTCAE grade 3, except for liver and gastrointestinal ≥ CTCAE grade 2)
• Need for concomitant use of drugs that are: moderate or strong inhibitors of CYP3A4 that may increase concentrations of KAND567; Inducers of CYP3A4 that may decrease concentrations of KAND567; highly dependent on CYP2B6, CYP2C8 or CYP3A4 for their metabolism where KAND567 may increase their concentrations. Treatment with such drugs should have been stopped at least five half-lives before initiation of KAND567 therapy. A list of drugs was provided.
• Continuous use of herbal preparations (e.g., St. John's wort) within 2 weeks prior to enrollment
• Any condition for which, in the opinion of the Investigator, participation would not be in the best interest of the participant (e.g., compromise well-being) or that could prevent, limit, or confound the protocol-specified assessments
• Known or suspected hypersensitivity to any of the IMPs.