Stereotactic Body Radiotherapy Plus FAK and RAF/MEK Inhibition in Advanced Pancreatic Adenocarcinoma

Phase II Study of Stereotactic Body Radiotherapy Plus FAK and RAF/MEK Inhibition in Advanced Pancreatic Adenocarcinoma

Advanced pancreatic cancer patients receiving treatment of adaptive stereotactic body radiotherapy (SBRT) with concurrent and adjuvant defactinib plus avutometinib will have increased progression-free survival (PFS) compared to historical PFS rates for patients receiving adaptive SBRT alone.

Inclusion Criteria:

• Histologically or cytologically confirmed advanced pancreatic adenocarcinoma that is considered borderline resectable or locally advanced per institutional standardized criteria of unresectability or medical inoperability (NCCN guidelines 2.2021 PANC-C 1 of 2).

• Patients with locoregional adenopathy are eligible as long as all suspicious lymph nodes are deemed to be adjacent to the primary tumor as per radiation oncologist assessment.

• Patients must have received at least 2 months of systemic chemotherapy, such as FOLFOX, FOLFIRINOX, gemcitabine, nab-paclitaxel, cisplatin, or other regimens, for this disease without progression of local or systemic disease. Newly diagnosed patients may be screened for enrollment in this study and can be enrolled once they have completed 2 months of systemic chemotherapy (and still meet all eligibility criteria) prior to randomization. The last dose of chemotherapy must be ≥ 2 weeks prior to randomization.

• At least 18 years of age.

• ECOG performance status ≤ 1.

• Life expectancy > 3 months

• Adequate bone marrow and organ function as defined below:

  • Absolute neutrophil count ≥ 1.5 K/cumm
  • Platelets ≥ 100 K/cumm
  • Hemoglobin ≥ 9.0 g/dL without transfusion in the preceding 14 days.
  • Total bilirubin ≤ 1.5 x IULN; no prior history of Gilbert's syndrome
  • AST(SGOT)/ALT(SGPT) ≤ 2.5 x IULN or ≤ 5.0 x IULN if due to liver involvement by tumor
  • Creatinine clearance ≤ 1.5 x IULN or glomerular filtration rate of ≥ 60 mL/min
  • INR ≤ 1.5 x IULN unless patient is receiving anticoagulant therapy as long as INR or PTT is within therapeutic range of intended use of anticoagulants
  • aPTT ≤ 1.5 x IULN unless patient is receiving anticoagulant therapy as long as INR or PTT is within therapeutic range of intended use of anticoagulants
  • Albumin ≥ 2.5 mg/dL
  • Creatine phosphokinase (CPK) ≤ 2.5 x IULN

• Adequate cardiac function with left ventricular ejection fraction ≥ 55% by echocardiography (ECHO) or multiple-gated acquisition (MUGA) scan.

• Corrected QT interval (QTc) < 480 ms (as calculated by the Fridericia correction formula).

• The effects of defactinib and avutometinib on the developing human fetus are unknown. For this reason and because radiation therapy is known to be teratogenic, women of childbearing potential and men must agree to use highly effective contraception (hormonal or barrier method of birth control, abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study and up to 30 days after completion of treatment, she must inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of the study, and 90 days after completion of the study

• Ability to understand and willingness to sign an IRB approved written informed consent document. Legally authorized representatives may sign and give informed consent on behalf of study participants.

Exclusion Criteria:

• A history of other malignancy with the exception of prior or concurrent malignancies whose natural history is unlikely to interfere with the safety or efficacy of the investigational regimen (in the opinion of the treating physician).

• Clinically evident ascites or pleural effusion that requires therapeutic paracentesis or thoracentesis.

• Prior treatment with a drug of the FAK inhibitor or RAF/MEK inhibitor class, or with an anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137, or anti-cytotoxic T-lymphocyte associated antigen 4 (CTLA-4) antibody (including ipilimumab or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways).

• Prior anti-human antibody response (AHA or ADA).

• Currently receiving any other investigational agents or has received any other investigational agents within 4 weeks or 5 half-lives, whichever is shorter, of randomization.

• A history of allergic reactions attributed to compounds of similar chemical or biologic composition to defactinib, avutometinib, or other agents used in the study, or a history of hypersensitivity to any of the inactive ingredients (hydroxypropylmethylcellulose, mannitol, magnesium stearate) of the investigational product.

• Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy or any other form of immunosuppressive therapy not routinely associated with chemotherapeutic regimen.

• Requires continued use of warfarin for anticoagulation and cannot stop warfarin or be safely switched to another anticoagulant or direct oral anticoagulant.

• Has an active autoimmune disease requiring systemic treatment with use of disease modifying agents, corticosteroids, or immunosuppressive drugs within the past 2 years. Replacement therapy such as thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc. is not considered a form of systemic treatment.

• Received a live vaccine within 30 days prior to randomization. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus Calmette-Guérin (BCG), and typhoid vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (e.g. FluMist) are live attenuated vaccines and are not allowed.

• Known history of hepatitis B (defined as hepatitis B surface antigen [HBsAg] reactive) or known active hepatitis C virus (defined as HCV RNA [qualitative] is detected).

• Has a history of (non-infectious) pneumonitis that required steroids or current pneumonitis.

• Has a known history of active TB (bacillus tuberculosis).

• Major surgery within 28 days prior to randomization.

• Pregnant and/or breastfeeding. Women of childbearing potential must have a negative pregnancy test within 14 days of randomization.

• Patients with HIV are eligible unless their CD4+ T-cell counts are < 350 cells/mcL or they have a history of AIDS-defining opportunistic infection within the 12 months prior to registration. Concurrent treatment with effective ART according to DHHS treatment guidelines and aligning with concomitant medication guidance is recommended.

• Known SARS-Cov2 infection ≤10 days prior to randomization.

• Exposure to medications (with or without prescriptions), supplements, herbal remedies, or foods with potential for drug-drug interactions with avutometinib and/or defactinib within 5 half-lives (if half-life is known) or 14 days prior to randomization. Specifically, this includes:

  • Strong CYP3A4 inhibitors or inducers
  • Strong CYP2C9 inhibitors or inducers
  • Strong P-glycoprotein (P-gp) inhibitors or inducers
  • Strong breast cancer resistance protein (BCRP) inhibitors or inducers.

• Subjects with the inability to swallow oral medications or impaired gastrointestinal absorption due to gastrectomy or active inflammatory bowel disease.

• Subjects with an active skin disorder that has required systemic therapy within the past year and may confound the interpretation of the safety findings from the study treatments, in the opinion of the investigator.

• History of medically significant rhabdomyolysis.

• Patients with concurrent ocular disorders:

  • Patients with history of glaucoma, history of retinal vein occlusion (RVO), predisposing factors for RVO, including uncontrolled hypertension, uncontrolled diabetes.
  • Patients with history of retinal pathology or evidence of visible retinal pathology that is considered a risk factor for RVO, intraocular pressure > 21 mm Hg as measured by tonometry, or other significant ocular pathology, such as anatomical abnormalities that increase the risk for RVO.
  • Patients with active or chronic, visually significant corneal disorders, other active ocular conditions requiring ongoing therapy or clinically significant corneal disease that prevents adequate monitoring of drug-induced keratopathy. Examples of visually significant corneal disorders include corneal degeneration, active or recurrent keratitis, and other forms of serious ocular surface inflammatory conditions. Visually significant corneal disorders do NOT include dry eyes, blepharitis, and uncomplicated corneal erosions.

• Concurrent congestive heart failure, prior history of class III/ IV cardiac disease (New York Heart Association [NYHA]), myocardial infarction within the last 6 months, unstable arrhythmias, unstable angina or severe obstructive pulmonary disease.

• Any other medical condition (eg, cardiac, gastrointestinal [eg, severe heartburn, gastric ulcer, etc], pulmonary, psychiatric, neurological, genetic, GI bleeding, substance abuse, alcoholism, etc) within 3 months prior to randomization that, in the opinion of the Investigator, would place the patient at unacceptably high risk for toxicity.

• Active, uncontrolled infection (bacterial, viral, or fungal) requiring systemic therapy, defined as ongoing signs/symptoms related to the infection without improvement despite appropriate antibiotics, antiviral therapy, and/or other treatment, or still febrile within 48 hours of stopping systemic therapy.

• Patients are unwilling to adhere to the lifestyle guidance listed in the protocol.