Inclusion
Male or female ≥ 18 years of age and willing and able to provide informed consent
Cytologically or histologically confirmed thymic carcinoma, which is incurable
Received prior systemic therapy for thymic carcinoma, or is ineligible for or refuses other therapies
Measurable disease, as per RECIST 1.1
Eastern Cooperative Oncology Group (ECOG) performance status of 0-1
Absolute neutrophil count (ANC) ≥ 1.5 × 10\^9/L
Platelets ≥ 100 × 10\^9/L
Hemoglobin ≥ 9 g/dL or ≥ 5.6 mmol/L
Serum creatinine ≤ 1.5 x upper limit of normal (ULN) OR measured or calculated creatinine clearance (CrCl) ≥ 50 mL/min (glomerular filtration rate \[GFR\] can also be used in place of creatinine or CrCl)
Estimated glomerular filtration rate (eGFR) value ≥ 50 mL/min for participants with creatinine levels \> 1.5 x institutional ULN
Creatinine clearance may be calculated using the Cockcroft-Gault formula or estimated glomerular filtration rate (eGFR) may be calculated using the Modification of Diet in Renal Disease (MDRD) GFR equation
Urine dipstick protein ˂ 2+ OR 24 hour urine protein quantification ˂ 1.0 g
Serum total bilirubin ≤ 1.5 x ULN OR direct bilirubin ≤ ULN
Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase \[SGOT\]) and alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase \[SGPT\]) ≤ 2.5 x ULN OR ≤ 5 x ULN for participants with liver metastases
Albumin ≥ 2.5 g/dL
International normalized ratio (INR) or prothrombin time (PT) ≤ 1.5 x ULN unless participant is receiving anticoagulant therapy, and then only as long as PT or partial thromboplastin time (PTT) is within therapeutic range of intended use of anticoagulants
Activated partial thromboplastin time (aPTT) ≤ 1.5 x ULN unless participant is receiving anticoagulant therapy, and then only as long as PT or PTT is within therapeutic range of intended use of anticoagulants
Female participants of childbearing potential must have a negative urine or serum pregnancy test. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required. The serum pregnancy test must be negative for the participant to be eligible. Female participants must agree to use a highly effective method of contraception from the beginning of screening until 120 days after the last dose of the ivonescimab, or be of non-childbearing potential. Non-childbearing potential is defined as follows (by other than medical reasons):
≥ 45 years of age and has not had menses for \> 2 years,
Participants who have been amenorrhoeic for \< 2 years without history of a hysterectomy and oophorectomy must have a follicle stimulating hormone value in the postmenopausal range upon screening evaluation, or
Post-hysterectomy, post-bilateral oophorectomy, or post-tubal ligation
Unsterilized male patients having sex with a female partner of childbearing potential, or a pregnant or breastfeeding partner must agree to use barrier contraception (male condom) for the duration of the treatment period until 120 days after the last dose of ivonescimab. Male patients with female partners of childbearing potential must have the female partner agree to use at least 1 form of highly effective contraception for the duration of the treatment period until 120 days after the last dose of ivonescimab
Male and female participants must agree not to donate sperm or eggs, respectively, from the first study-drug treatment through 120 days after the last study drug treatment
Female participants must agree to not breastfeed during the study or for 120 days after the last dose of study treatment
The patient has a known allergy/history of hypersensitivity reaction to any of the treatment components or any other contraindication to one of the administered treatments
Active autoimmune condition currently requiring systemic immune suppressive therapy
Positive paraneoplastic serologies, including binding, blocking and modulating antibodies to acetylcholine receptor (AChR)
If known muscle-specific kinase (MuSK) antibodies positive then excluded, otherwise additional testing not required
Major surgical procedures or serious trauma within 4 weeks prior to randomization, or plans for major surgical procedures within 4 weeks after the first dose (as determined by the investigator). Minor local procedures (excluding central venous catheterization and port implantation) within 3 days prior to randomization
Poorly controlled hypertension with repeated systolic blood pressure ≥ 150 mmHg or diastolic blood pressure ≥ 100 mmHg after oral antihypertensive therapy
Presence of angina or active cardiac ischemia, uncontrolled congestive heart failure of current ≥ class III as defined by the New York Heart Association, or unstable cardiac arrhythmia (e.g., clinically stable atrial fibrillation is permitted)
The patient has experienced myocardial infarction within 6 months prior to study enrollment
History of arterial or venous thrombosis or thromboembolism within 6 months prior to study enrollment. Patients with a history of venous thromboembolism beyond 6 months prior to study enrollment can be enrolled if they are appropriately anticoagulated
Imaging during the screening period shows that the tumor surrounds important blood vessels or has obvious necrosis and/or cavitation, and the investigator determines that entering the study is a bleeding or fistula risk. Replacement therapy (eg, thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency) is permitted
The patient has any ongoing or active infection requiring the use of parenteral anti-microbial agents, or grade \> 2 by NCI CTCAE (v5.0) within 14 days prior to enrollment. Patient with a history of HIV with an undetectable viral load and cluster of differentiation 4 (CD4) count over 200 are eligible. Patients with a history of hepatitis B or hepatitis C, an undetectable viral load, and liver function test (LFT) testing which meets criteria for the study are eligible
The patient is pregnant or breastfeeding, or expecting to conceive or father children within the projected duration of the trial, starting with the screening visit through 210 days after the last dose of trial treatment
Progressive or symptomatic brain metastases. Brain metastases that have been radiated, are asymptomatic, and on a stable or decreasing dose of steroids are allowed. Leptomeningeal disease is excluded
History of another cancer within 2 years of study initiation, with the exception of fully treated cancers unlikely to affect the assessment of the study treatment safety or efficacy including early stage breast, prostate, bladder, non-melanomatous skin, thyroid, cervical, or endometrial cancer
History of bleeding tendencies or coagulopathy and/or clinically significant bleeding symptoms or risk within 4 weeks prior to randomization, including but not limited to:
Hemoptysis (defined as coughing up ≥ 0.5 teaspoon of fresh blood or small blood clots)
Note: transient hemoptysis associated with diagnostic bronchoscopy is allowed
Nasal bleeding/epistaxis (bloody nasal discharge is allowed)
Current use of prophylactic or full-dose anticoagulants or anti-platelet agents for therapeutic purposes that is not stable prior to randomization is not allowed. The use of full-dose anticoagulants is permitted as long as the international normalized ratio (INR) or activated partial thromboplastin time (aPTT) is within therapeutic limits according to the medical standard of the enrolling institution. History of esophageal gastric varices, severe ulcers, wounds that do not heal, abdominal fistula, intra-abdominal abscesses, or acute gastrointestinal bleeding within 6 months before randomization
History of perforation of the gastrointestinal tract and/or fistula, history of gastrointestinal obstruction (including incomplete intestinal obstruction requiring parenteral nutrition), extensive bowel resection (partial colectomy or extensive small bowel resection) within 6 months prior to randomization
Active autoimmune or lung disease requiring systemic therapy (eg, with disease modifying drugs, prednisone \> 10 mg daily or equivalent, immunosuppressant therapy) within 2 years prior to randomization, however the following will be allowed:
Replacement therapy (eg, thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency) is permitted.
Intermittent use of bronchodilators, inhaled corticosteroids, or local corticosteroid injections is permitted
Has pre-existing peripheral neuropathy that is ≥ grade 2 by CTCAE version 5
Uncontrolled pleural effusions, pericardial effusions, or ascites that is clinically symptomatic
Patients managed with indwelling catheters (eg, PleurX) are allowed
History of non-infectious pneumonia requiring systemic corticosteroids, or current interstitial lung disease
Active or prior history of inflammatory bowel disease (eg, Crohn's disease, ulcerative colitis, or chronic diarrhea)
Known history of human immunodeficiency virus (HIV) whose viral load is not controlled
Current use of systemic corticosteroids (\> 10 mg daily prednisone or equivalent)
Known history of allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation
Live vaccine or live attenuated vaccine within 4 weeks prior to planned randomization, or if scheduled to receive a live vaccine or live attenuated vaccine during the study period. Inactivated vaccines are permitted
Participants must not be considered a poor medical risk due to a serious, uncontrolled medical disorder, nonmalignant systemic disease, or active, uncontrolled infection. Examples include, but are not limited to, uncontrolled ventricular arrhythmia, uncontrolled major seizure disorder, unstable spinal cord compression, superior vena cava syndrome, or any psychiatric disorder that prohibits obtaining informed consent
Patient unwilling or unable to comply with the protocol
Any condition that, in the opinion of the investigator or sponsor, would interfere with evaluation of the investigational product or interpretation of subject safety or study results