This is a multicenter, randomized, open-label, phase Ib study to evaluate the safety, efficacy and pharmacokinetic characteristics of Mitoxantrone Hydrochloride Liposome in subjects with advanced solid tumor.

This is a multicenter, randomized, open-label, phase Ib study to evaluate the safety, efficacy and pharmacokinetic characteristics of Mitoxantrone Hydrochloride Liposome in subjects with advanced solid tumor. 90 subjects will be recruited. The first 60 subjects will be randomly assigned into 2 groups, group A and group B. The 30 subjects in group A will receive the Mitoxantrone Hydrochloride Liposome 20 mg/m2 by an intravenous infusion (IV), every 28 days (q4w, 1 cycle). The 30 subjects in group B will receive Mitoxantrone Hydrochloride Liposome 20 mg/m2, IV, every 21 days (q3w, 1 cycle). After this, the last 30 subjects will be assigned into group B. All subjects will receive the treatment until disease progression, intolerable toxic reaction, death, or withdrawal by investigator or subject decision (a maximum of 8 cycles). Delays in drug administration is allowed from cycle 2, however, the delays should be no more than 3 weeks. Dose adjustments after cycle 2 is permitted, and the minimum dose is 12 mg/m2.

Inclusion Criteria:

1. Subjects fully understand and voluntarily participate in this study and sign informed consent;
2. Age ≥18, without gender limitation;
3. Histologically and/or cytologically confirmed diagnosis of unresectable local or metastasizing advanced solid tumor;
4. Fail to respond to standard therapy or lack of effective treatment, including no standard therapy, intolerance of standard therapy, etc.;
5. At least one measurable lesion according to RECIST v1.1;
6. ECOG performance status of 0 or 1;
7. AEs from the previous treatment have resolved to ≤ Grade 1 based on CTCAE (except for the toxicity without safety risk judged by the investigator, such as hair loss, hyperpigmentation);
8. Adequate organ function;
9. Subjects of childbearing potential must agree to use effective contraceptive measures. Female subjects must have a negative pregnancy test before enrollment;
10. Fully comply with the protocol.

Exclusion Criteria:

1. History of allergy to mitoxantrone hydrochloride or any excipients of the study drug;
2. Untreated or symptomatic central nervous system (CNS) metastases;
3. CTCAE Grade 3 or Grade 4 gastrointestinal hemorrhage within 12 weeks prior to the first dose administration;
4. History of allotransplantation;
5. Known hepatitis B virus (HBV), hepatitis C virus (HCV), human immunodeficiency virus (HIV) or other active viral infection;
6. Serious infection or interstitial pneumonia within 1 week prior to the first dose administration;
7. Use of other anticancer treatment within 4 weeks prior to the first dose administration;
8. Enrolled in any other clinical trials within 4 weeks prior to the first dose administration;
9. Major surgery within 3 months prior to the first dose administration, or have a surgical schedule during the study period;
10. Thrombosis or thromboembolism within 6 months prior to screening;
11. History of, or known additional malignant tumor within 3 years, except for tumors have been cured and have not recurred, and carcinoma in situ;
12. Impaired cardiac function or serious cardiac disease;
13. Previous treatment with adriamycin or other anthracyclines, and the total cumulative dose of prior adriamycin or equivalent is >350 mg/m2;
14. Life expectancy<12 weeks;
15. Pregnant or lactating female;
16. Serious and/or uncontrolled systemic diseases;
17. Not suitable for this study as decided by the investigator due to other reasons.