Summary

This phase II trial studies how well atezolizumab or atezolizumab plus bevacizumab works in treating patients with alveolar soft part sarcoma that has not been treated, has spread from where it started to other places in the body (advanced) and cannot be removed by surgery (unresectable). Atezolizumab works by unblocking the immune system, allowing the immune system cells to recognize and then attack tumor cells. Bevacizumab works by controlling the growth of new blood vessels. Giving atezolizumab alone or atezolizumab with bevacizumab may shrink the cancer.

Objectives

PRIMARY OBJECTIVES:
I. Determine the objective response rate (ORR) using Response Evaluation Criteria in Solid Tumors (RECIST) version (v) 1.1 of atezolizumab in patients with advanced alveolar soft part sarcoma (ASPS) in adult subjects >= 18 years and in pediatric/adolescent subjects >= 2 years.
II. Determine the ORR using RECIST v 1.1 of atezolizumab and bevacizumab in subjects >= 18 years old with advanced ASPS that has progressed on atezolizumab monotherapy.

SECONDARY OBJECTIVES:
I. Determine duration of response (DOR) to atezolizumab monotherapy or atezolizumab plus bevacizumab using RECIST v 1.1 and/or change in clinical symptoms.
II. Measure progression-free survival (PFS) time for patients receiving atezolizumab monotherapy or atezolizumab plus bevacizumab as determined by investigator using RECIST v 1.1.
III. Assess the number of activated CD8+ T cells infiltrating the tumor before and after treatment with atezolizumab monotherapy or atezolizumab plus bevacizumab, and correlate treatment-induced changes with clinical response.
IV. Measure and describe the atezolizumab pharmacokinetics (PK) and anti-drug antibodies (ADA) in patients ages 2-11 years old.

EXPLORATORY OBJECTIVES:
I. Compare RECIST v 1.1 vs immune RECIST (iRECIST) in patients with ASPS on atezolizumab and atezolizumab + bevacizumab.
II. Assess the post-progression response rate among patients who progress while on treatment holiday and then resume treatment.
III. Analyze the genomic and immune profiles of tumors expressing type 1 or type 2 ASPL-TFE3 fusions and correlate findings with response to atezolizumab or atezolizumab in combination with bevacizumab.
IV. Measure and describe the atezolizumab pharmacokinetics (PK) in patients >= 12 years old.

OUTLINE: Patients are assigned to 1 of 2 arms.

ARM I: Patients receive atezolizumab intravenously (IV) over 30-60 minutes on day 1. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients in arm I who do achieve disease progression may cross-over to arm II. Patients also undergo computed tomography (CT) imaging, and collection of blood and urine at baseline.

ARM II: Patients receive atezolizumab IV over 30-60 minutes and bevacizumab IV over 30-90 minutes on day 1. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients also undergo CT imaging, and collection of blood and urine at baseline.

After completion of study treatment, patients are followed up for 27-30 days. Patients who are progression-free at the end of a 2-year treatment holiday are followed every 6 months.

Eligibility

1. Patients must have histologically or cytologically confirmed alveolar soft part sarcoma that is not curable by surgery. Diagnosis of malignancy must be confirmed by the department of pathology at the institution where the patient is enrolled prior to patient enrollment. To be eligible for atezolizumab in combination with bevacizumab, the patient must have atezolizumab-refractory/resistant disease that has progressed (definitive clinical progression or confirmed progressive disease [iCPD]) on prior 10005 atezolizumab monotherapy
2. Patients must have measurable disease, defined as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded for non-nodal lesions and short axis for nodal lesions) as >= 20 mm (>= 2 cm) by chest x-ray or as >= 10 mm (>= 1 cm) with computed tomography (CT) scan, magnetic resonance imaging (MRI), or calipers by clinical exam * Note: Once the primary endpoint of the trial has been met, pediatric patients may enroll with evaluable non-measurable disease and will not be required to have measurable disease. Evaluable non-measurable disease is that which is not measurable by RECIST1.1 but can be evaluated by imaging (e.g., CT, bone scan, or ultrasound) or other methods
3. Patients with newly diagnosed, unresectable, metastatic and measurable ASPS will also be eligible for atezolizumab monotherapy if they show clinical evidence of disease progression (including history and increasing physical symptoms); on-study documentation will include a physician’s rationale that supports evidence of clinical disease progression (i.e., increasing tumor pain)
4. To be eligible for atezolizumab monotherapy, subjects must be >= 2 years of age. To be eligible for atezolizumab in combination with bevacizumab, subjects must be >= 18 years of age
5. Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky or Lansky >= 70%)
6. Life expectancy of greater than 3 months
7. Absolute neutrophil count >= 1,500/mcL
8. Platelets >= 100,000/mcL
9. Hemoglobin >= 8 g/dL
10. Total bilirubin =< 1.5 x institutional upper limit of normal (ULN) (however, patients with known Gilbert disease who have serum bilirubin level =< 3 x ULN may be enrolled)
11. Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]) =< 3 x ULN (AST and/or ALT =< 5 x ULN for patients with liver involvement)
12. Alkaline phosphatase =< 2.5 x ULN (=< 5 x ULN for patients with documented liver involvement or bone metastases)
13. Creatinine clearance for adult patients (>= 18 years of age): >= 30 mL/min/1.73 m^2 by Cockcroft-Gault; for pediatric patients (< 18 years of age), a serum creatinine based on age and gender as follows: * Age 2 to < 6 years, maximum serum creatinine (mg/dL) male 0.8, female 0.8; * Age 6 to < 10 years, maximum serum creatinine (mg/dL) male 1, female 1; * Age 10 to < 13 years, maximum serum creatinine (mg/dL) male 1.2, female 1.2; * Age 13 to < 16 years, maximum serum creatinine (mg/dL) male 1.5, female 1.4; * Age 16 to < 18 years, maximum serum creatinine (mg/dL) male 1.7, female 1.4
14. Administration of atezolizumab or bevacizumab may have an adverse effect on pregnancy and poses a risk to the human fetus, including embryo-lethality. Female patients of child-bearing potential and male patients must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation, and for 5 months (150 days) after the last dose of atezolizumab or 6 months (180 days) after the last dose of bevacizumab. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately
15. Ability to understand and the willingness to sign a written informed consent document or a parent/guardian able to do the same
16. Willingness to provide biopsy samples for research purposes (patients >= 18 years of age only). At the principal investigator (PI’s) discretion, archival tissue that was collected and preserved may be used in lieu of a baseline biopsy, provided no anti-cancer agents or immunotherapies were received since collection of the archival tissue
17. Patients who have received live attenuated vaccines within 30 days of the first dose of trial treatment are eligible at the discretion of the investigator. All seasonal influenza vaccines and vaccines intended to prevent SARS-CoV-2 and coronavirus disease 2019 (COVID-19) are allowed
18. For patients not receiving therapeutic anticoagulation: international normalized ratio (INR) or activated partial thromboplastin time (aPTT) =< 1.5 x ULN for bevacizumab patients
19. For patients receiving therapeutic anticoagulation: stable anticoagulant regimen for bevacizumab patients

Treatment Sites in Georgia