Phase I Clinical Trial of Olaratumab Plus Trabectedin in Advanced Soft-tissue Sarcoma Patients
Phase I Clinical Trial of Olaratumab Plus Trabectedin in Advanced Soft-tissue Sarcoma Patients
Phase I, multicentre clinical trial of olaratumab plus trabectedin in patients with advanced soft-tissue sarcoma.
Olaratumab plus trabectedin could be synergistic and with a manageable toxicity profile in advanced STS.
The study is a phase I, non-randomised, one-armed, multicenter trial, open-label.
The dose escalation rules include patients in blocks of 3 o 6 patient. Treatment is a combination of unlimited cycles of oralatumab and trabectedin.
Primary clinical study endpoint of phase I:
- Determine the maximum tolerated dose (MTD) or the recommended dose of olaratumab combined with trabectedin in advanced soft tissue sarcoma
Secondary clinical study endpoints:
PHASE I DESIGN
The number of evaluable patients to be included in this trial is 25. However 28 patients will be enrolled considering the possibility of 3 non-evaluable cases.
The dose escalation rules proceed as follows: escalating in cohorts of 3-6 patients per dose level. Three patients are treated at a given dose level. If at least 2 patients are observed to have dose-limiting toxicity (DLT), the prior dose level is defined as the maximum tolerable dosage (MTD) (unless only 3 patients have been treated at that level, in which case it is the tentative MTD). If 0 of the 3 patients are observed to have DLT, the dose level is escalated one step for the next cohort of 3 patients, and the process continues as above. If exactly 1 of the 3 patients treated show DLT, 3 additional patients are treated at the current dose level. If none of these additional 3 patients show DLT, the dose level is escalated for the next cohort of 3 patients, and the process continues as above; otherwise, the prior dose level is defined as the MTD.
Dose-limiting toxicity (DLT) is usually defined as cycle 1 grade 3 or above toxicity, excepting grade 3 neutropenia unaccompanied by either fever or infection. More specifically, for this clinical trial, DLT will be applied only to either of the following toxicities occurring during the first treatment cycle:
Hematological toxicity:
Non-hematological toxicities:
Grade 3-4 events, excluding:
Dose-escalation levels:
LEVEL -1: Olaratumab 15 mg/Kg D1 and D8 + Trabectedin 0.9 mg/m2 D1 This is a security level in case level 0 causes DLT.
LEVEL 0*: Olaratumab 15 mg/Kg D1 and D8 + Trabectedin 1.1 mg/m2 D1
LEVEL 1: Olaratumab 15 mg/Kg D1 and D8 + Trabectedin 1.3 mg/m2 D1
LEVEL 2: Olaratumab 15 mg/Kg D1 and D8 + Trabectedin 1.5 mg/m2 D1
LEVEL 3**: Olaratumab 20 mg/kg Cycle 1, Day 1 (C1D1) and Cycle 1, Day 8 (C1D8) (induction) + Trabectedin 1.5 mg/m2 D1 Olaratumab 15 mg/kg D1 and D8 (maintenance) + Trabectedin 1.5 mg/m2 D1
* Dose starting level is 0.
**In the LEVEL 3 Olaratumab dose of 20 mg/kg will be considered only for the first 2 doses (as induction doses, cycle 1 days 1 and 8)) and then, the maintenance dose will be 15 mg/m2 for the rest of cycles.
Each cycle encompasses 21 days. It is not allowed dose-escalation for one given patient.
For safety reasons the first patient will be followed for 1 week before any other patient can be enrolled, given than the combination of trabectedin and olaratumab hasn't been administered to any patient so far.
For the inclusion of the third patient in a given dose-level it is necessary to have all the safety information of the first cycle of the previous 2 patients included in the same dose-level. Before moving on to the next dose-level, at least three patients must have been followed during 3 weeks (1 cycle).
The proposed trabectedin dose-level escalation is supported by previous phase I trials focusing on trabectedin combination. In STS, the lowest level for trabectedin was 0.9 mg/m2 for combination with doxorubicin 60 mg/m2 and showed to be active61. With other antiangiogenic agents, combination produced prolonged cytopenias. Therefore, starting level 0 uses Trabectedin 1.1mg/m2.
* Tumor samples to be collected: The most recent archive tumor sample (1 block) must be donated for diagnosis confirmation and for biomarker analysis and another tumor sample after 2 cycles of olaratumab and trabectedin is also mandatory..
When feasible another tumor block should be collected after treatment.
* Translational study:
Samples:
Inclusion Criteria:
Patients must provide written informed consent prior to performance of study specific procedures and must be willing to comply with treatment and follow-up.
Age: 18-80 years.
Histologic diagnosis of soft tissue sarcoma: liposarcoma (dedifferentiated and myxoid/round cell), leiomyosarcoma, undifferentiated pleomorphic sarcoma, synovial sarcoma confirmed, before enrolment confirmation, by central pathology review by a paraffin embedded tumor tissue.
Metastatic/advanced disease in progression in the last 6 months.
Patients had previously received at least anthracyclines if clinically indicated.
Previous olaratumab administration is allowed.
Measurable disease according to RECIST 1.1 criteria.
ECOG Performance Status of 0-1.
Adequate hepatic, renal, cardiac, and hematologic function.
Laboratory tests as follows: Haemoglobin >9g/dl, Absolute neutrophil count ≥ 1,500/mm³, Platelet count ≥ 100,000/mm³, Total Bilirubin ≤ 1.5 mg/dL, PT≤ 1.5 ULN and INR ≤ 1.5, AST and ALT ≤ 2.5 times upper limit of normal, Creatinine
≤ 1.5 mg/dL Calcium ≤ 12 mg/dL and Blood glucose < 150 mg/dL, Urine protein assessment: <2+, and/or <3.5g protein/24h.
Left ventricular ejection fraction ≥ 50% by echocardiogram or MUGA scan.
Having a central venous portal is mandatory before treatment initiation.
Females of childbearing potential must have a negative serum or urine pregnancy test within 7 days prior to enrollment. Females of child-bearing potential and males and must agree to use highly effective contraceptive precautions during the trial and up to 6 months following the last dose of study drug. A highly effective method of birth control is defined as one that results in a low failure rate (that is, <1% per year) when used consistently and correctly, such as implants, injectables, combined oral contraceptives, some intrauterine contraceptive devices (IUDs), sexual abstinence, or a vasectomized partner.
Exceptions: Females not of child-bearing potential due to surgical sterilization (at least 6 weeks following surgical bilateral oophorectomy with or without hysterectomy or tubal ligation) confirmed by medical history or menopause. A "postmenopausal woman" is a woman meeting either of the following criteria:
Exclusion criteria:
More than 2 previous lines of chemotherapy for advanced disease. Previous trabectedin not allowed.
Hipersensitivity to olaratumab.
The following histologies are not included: Ewing Sarcoma, extraskeletal osteosarcoma, extraskeletal myxoid chondrosarcoma, Kaposi's sarcoma, rhabdomyosarcoma and gastrointestinal stromal tumor (GIST).
Uncontrolled intercurrent illness including (not limited to): symptomatic congestive heart failure (CHF) (New York Heart Association [NYHA] III/IV), unstable angina pectoris or coronary angioplasty, or stenting within 24 weeks prior to registration, unstable cardiac arrhythmia (ongoing cardiac dysrhythmias of NCI-CTCAE] version 5.0 Grade >= 2), known psychiatric illness that would limit study compliance, intra-cardiac defibrillators, known cardiac metastases, or abnormal cardiac valve morphology (>= Grade 3).
Positive test for hepatitis B virus surface antigen (HBV sAg) or hepatitis C virus ribonucleic acid (HCV antibody) indicating acute or chronic infection.
Other disease or illness within the past 6 months, including any of the following:
The patient has electively planned or will require major surgery during the course of the study
Social situation that would preclude study compliance.
Prolonged QTc interval (i.e., QTc > 450 msec for males or QTc > 470 msec for females) on baseline ECG.
Hemorrhage ≥ Grade 3 in the past 4 weeks.
Females who are pregnant or breast-feeding.