This is a phase 1/2, dose-escalation and expansion study investigating the safety, pharmacokinetics, and efficacy of RVU120 (SEL120) in patients with metastatic or advanced solid tumors progressing from previous lines of therapy.

The dose-escalation phase (Part 1) will be followed by an expansion phase (Part 2). Part 1 will evaluate the safety/tolerability and pharmacokinetics of increasing doses of RVU120 (SEL120) administered as a single dose every other day (7 doses in a 3 week cycle). Part 2 will collect additional data on safety, pharmacokinetics and efficacy at the recommended dose in patients with tumor types selected in Part 1.

Inclusion Criteria

1. Age 18 years or older;

2. Histologically confirmed and/or documented advanced or metastatic tumors who have exhausted the available standard treatment(s) of the respective country and/or progressing from at least one previous systemic therapy and not eligible to further available therapy;

3. At least one measurable or evaluable disease according to RECIST v1.1;

4. Performance status of ECOG 0-2;

5. Estimated life expectancy of at least 12 weeks;

6. Toxicities incurred as a result of previous anti-cancer therapy resolved to ≤ Grade 1 (as defined by NCI CTCAE v5.0), except for alopecia, lymphopenia assessed as non-clinically significant, sensory neurotoxicity and erectile dysfunction that could be ≤ G2;

7. At least a 4-week interval between the last received radiotherapy and the first scheduled day of dosing with RVU120 (SEL120) (with the exception of palliation radiotherapy which is allowed up to 2 weeks prior the first scheduled day of dosing);

8. Complete recovery from major surgery (stable and < Grade 2 toxicity sequela acceptable);

9. At least 2 weeks beyond high dose systemic corticosteroids (however, low dose corticosteroids < 20 mg prednisone or equivalent daily are permitted);

10. Laboratory values at Screening and or at D1C1 pre-dose:

    1. Absolute neutrophil count ≥1.5 x 109/L without colony stimulating factor support;
    2. Platelets 100 x 109/L;
    3. Only for Part 1: Hemoglobin ≥9 g/dL (or ≥2.2 mmol/L) without RBC transfusion within 4 weeks;
    4. Serum albumin ≥ 30g/L (3.0g/dL);
    5. Total bilirubin <1.5 times the upper limit of normal (ULN);
    6. AST (SGOT) ≤3 x ULN; ALT (SGPT) ≤3 x ULN; (≤5 x ULN for patients with advanced solid tumors with liver metastases); ALP ≤5 x ULN for patients with advanced solid tumors with bone or liver metastases
    7. Creatinine clearance ≥60 mL/min (Cockroft-Gault formula Appendix 4);
    8. Normal coagulation (elevated INR, prothrombin time or APTT <1.3 x ULN acceptable);

11. Left ventricular ejection fraction> 50% by echocardiogram or MUGA;

12. Able to provide an archival or fresh tumor biopsy sample at Screening. For patients in Part 2 of study, baseline tumor biopsy samples from progressive disease lesions, where feasible, are required;

13. For women of childbearing potential (WOCBP), a negative pregnancy test must be confirmed before enrolment. WOCBP must commit to using highly effective contraception during study participation and until 6 months after the last dose of study drug. Females must also refrain from donating blood or egg (ovum) during the same time-period;

14. For males, an effective barrier method of contraception must be used during study participation until 6 months after the last dose of study drug, if the patient is sexually active with a WOCBP. Males must also refrain from donating blood or sperm during the same time-period;

15. Ability to give written, informed consent prior to any study-specific Screening procedures, with the understanding that the consent may be withdrawn by the patient at any time without prejudice;

16. Capable of understanding the mandated and optional protocol requirements, is willing and able to comply with the study protocol procedures and has signed the main informed document prior to any study specific procedure. For any optional biopsy sampling (tissue and/or blood) and long-term sample storage, additional consent is required;

17. Patients must have been off anti-cancer treatment and prohibited concomitant medications, for 4 weeks or 5 half-lives, whichever is shorter;

    Specific Additional Inclusion Criteria for Part 2 (Group A1):

18. Histologically or cytologically confirmed TNBC of the MSL subtype based on the most recent analyzed biopsy or other pathology specimen.

    Specific Additional Inclusion Criteria for Part 2 (Group A2):

19. Histologically or cytologically confirmed TNBC other than the MSL subtype based on the most recent analyzed biopsy or other pathology specimen.

Exclusion Criteria

1. Active brain metastasis [patients with treated, non-progressive brain metastases, off high-dose steroids (>20 mg prednisone or equivalent) for at least 4 weeks can be enrolled in the trial];

2. Prior history of or planned organ or hematopoietic stem cell transplant;

3. Evidence of ongoing and uncontrolled systemic bacterial, fungal, or viral infection and acute inflammatory conditions (including pancreatitis);

4. Known HIV infection with a CD4+ T-cell (CD4+) count of less than 350 cells/μL or a history of AIDS defining opportunistic infection within the past 12 months or on established antiretroviral therapy for less than 4 weeks or presenting with a viral load of more than 400 copies/mL prior to enrollment or on antiretroviral therapy or prophylactic antimicrobials that are expected to cause significant DDIs or overlapping toxicities with study treatment and cannot be changed to alternative agents;

5. Known positive test of / or known active diagnosis of COVID-19 viral infection.

6. Ongoing significant liver disease such as cirrhosis, drug-induced liver injury, active hepatitis or chronic persistent hepatitis B and/or C;

   • Positive serologic or PCR test results for acute or chronic HBV infection. Patients whose HBV infection status cannot be determined by serologic test results must be negative for HBV by PCR to be eligible for study participation. (www.cdc.gov/hepatitis/hbv/pdfs/serologicchartv8.pdf)
   • Acute or chronic HCV infection. Patients who are positive for HCV antibody must be negative for HCV by PCR to be eligible for study participation.

7. Impairment of gastrointestinal function or gastrointestinal disease that may significantly alter the absorption of RVU120 (SEL120) (e.g., active inflammatory bowel disease, ulcerative disease, malabsorption syndrome, short bowel syndrome, uncontrolled nausea, persistent vomiting or diarrhea);

8. Ongoing drug-induced pneumonitis;

9. Concurrent participation in another investigational clinical trial;

10. Taking any medications, herbal supplements or other substances (including smoking) that are known to be strong inhibitors or strong inducers or sensitive substrates of CYP1A2; with the exception of antibiotics, antifungals, and antivirals that are used as the standard of care or to prevent or treat infections and other such drugs that are considered absolutely essential for the care of the patient and no suitable or available alternative could be found, with prior approval of the Sponsor Study Medical Director;

11. Mean measurement QTcF of >470 msec on triplicate electrocardiograms (ECGs) performed within 5 minutes of each other, using QTcF (Fredericia) formulation;

12. Currently taking drugs that are documented in the drug package insert, to have risk of causing prolonged QTc or torsades de pointes (TdP) (unless these can be changed to acceptable alternatives or discontinued). Please also consult the following Credible Meds web page: https://crediblemeds.org/index.php/login/dlcheck (antibiotics, antifungals, and antivirals that are used as standard of care or to prevent or treat infections and other such drugs that are considered absolutely essential for the care of the patient and no suitable or available alternative could be found, can be used with prior approval by Sponsor Study Medical Director)

13. Patients with clinically significant cardiovascular disease. This includes: Myocardial infarction or unstable angina < 6 months prior to Screening; NYHA Grade III or greater congestive heart failure (Appendix 8); cerebrovascular accident including transient ischemic attack within the past 6 months; Uncontrolled hypertension; Serious or uncontrolled cardiac arrhythmia; Personal history of Torsade de Pointe or syndrome of congenital QTc prolongation or QTc > 470 msec.;

14. Any other prior or current medical condition, intercurrent illness, surgical history, physical or electrocardiogram (ECG) findings, laboratory abnormalities, or extenuating circumstance (e.g., alcohol or drug addiction) that, in the Investigator's opinion, could jeopardize patient safety or interfere with the objectives of the study;

15. Pregnant or breast-feeding females;

    Specific Exclusion Criteria for Part 2, Group A1 and A2:

16. Prior history of malignancies other than TNBC, unless the patient has been free of the disease for 5 years or more prior to Screening. Exceptions to the ≥5-year time limit include history of the following:

    1. basal cell carcinoma of the skin;
    2. non-metastatic squamous cell carcinoma of the skin;
    3. carcinoma in situ of the cervix;
    4. carcinoma in situ of the breast;
    5. carcinoma in situ of the bladder;
    6. incidental histological finding of prostate cancer (Tumor/Node/Metastasis [TNM] stage of T1a or T1b).

17. More than 3 prior lines of systemic therapy for metastatic disease.