On September 14, 2024 Pfizer Inc. reported longer-term follow-up results from the Phase 2 single-arm PHAROS clinical trial evaluating the efficacy and safety of BRAFTOVI (encorafenib) in combination with MEKTOVI (binimetinib) for patients with BRAF V600E-mutant metastatic non-small cell lung cancer (NSCLC) (Press release, Pfizer, SEP 14, 2024, View Source [SID1234646587]). After an additional 18 months of follow-up, the objective response rate (ORR) and the median duration of response (DoR) as assessed by independent radiology review were 75% and 40 months in treatment-naïve patients and 46% and 16.7 months in previously treated patients, respectively. In addition, after approximately three years of follow-up in treatment-naïve patients, the median progression-free survival (PFS) with BRAFTOVI + MEKTOVI was 30.2 months (95% confidence interval [CI], 15.7-not estimable [NE]), while median overall survival (OS) was not yet reached (95% CI, 31.3-NE). These data will be presented today during a late-breaking oral session (Abstract LBA56) at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Congress 2024 in Barcelona, Spain.
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"BRAF V600E-mutant metastatic non-small cell lung cancer tends to be aggressive, and effective targeted first-line treatment options with manageable safety profiles are critical for the thousands of people who are diagnosed globally each year," said Gregory Riely, M.D., Ph.D., Vice Chair, Clinical Research in the Department of Medicine at Memorial Sloan Kettering Cancer Center (MSK) and PHAROS investigator. "The longer-term follow-up results from the PHAROS trial represent an important step forward in the treatment of BRAF V600E-mutant metastatic NSCLC, especially for treatment-naïve patients. These compelling results support the BRAFTOVI + MEKTOVI combination as a standard of care option for these patients."
Lung cancer is the number one cause of cancer-related death around the world.1 NSCLC accounts for approximately 80-85% of lung cancers,2 with BRAF V600E mutations occurring in about 2% of patients with NSCLC.3 Understanding the role of the mitogen-activated protein within the pathway including BRAF V600E-mutant metastatic NSCLC.
The Phase 2 PHAROS trial (NCT03915951) is an open-label, multicenter, single arm study examining BRAFTOVI + MEKTOVI combination therapy in treatment-naïve and previously treated patients with BRAF V600E-mutant metastatic NSCLC. Notably, upon longer-term follow-up in previously treated patients, BRAFTOVI + MEKTOVI showed a median PFS of 9.3 months (95% CI, 6.2-24.8) and a median OS of 22.7 months (95% CI, 14.1-32.2), with a safety profile that was consistent with previous findings; no new safety concerns were identified. In this analysis, treatment-related adverse events (AEs) led to dose reduction in 26% of patients, and to permanent discontinuation in 16% of patients. Nausea, diarrhea, and fatigue remained the most common treatment-related AEs.
"These potentially practice-changing results from the PHAROS trial show that the combination of BRAFTOVI + MEKTOVI is providing long-term compelling efficacy for patients, and although no definitive conclusions can be made across trials, the duration of response and progression-free survival in treatment naïve patients appear to be the longest observed for BRAF V600E–mutant metastatic NSCLC compared with historical outcomes," said Roger Dansey, M.D., Chief Development Officer, Oncology, Pfizer. "These latest data reflect our deep understanding of the science behind biomarker-driven cancers and add to our legacy in developing innovative targeted treatments in NSCLC. We are continuing to build upon this strong foundation with a pipeline of targeted medicines and combinations across our tumor areas of focus, including the ongoing investigation of BRAFTOVI in earlier settings of metastatic colorectal cancer, and the exploration of a next-generation brain-penetrant BRAF inhibitor."
BRAFTOVI + MEKTOVI was approved by the U.S. Food and Drug Administration (FDA) in October 2023, and by the European Commission in August 2024, for the treatment of BRAF V600E-mutant metastatic NSCLC based on the initial ORR (the primary endpoint) and DoR (key secondary endpoint) results from the PHAROS clinical trial.
In addition to PHAROS, safety lead-in data from the ongoing Phase 3 BREAKWATER study investigating BRAFTOVI in combination with cetuximab and FOLFIRI chemotherapy in previously untreated BRAF V600E-mutant metastatic colorectal cancer (CRC) will also be presented as a mini-oral session at ESMO (Free ESMO Whitepaper) (Abstract 515MO). BRAFTOVI in combination with cetuximab and FOLFIRI was found to be generally tolerable in this patient population, with no new safety concerns identified. These findings support the ongoing investigation of this combination regimen as a potential treatment option for BRAF V600E-mutant metastatic CRC. The Phase 3 BREAKWATER trial is ongoing, with updated data expected in 2025.
BRAF mutations can occur in a number of tumor types, including metastatic melanoma, metastatic CRC and metastatic NSCLC. Among different types of BRAF mutations, the BRAF V600E mutation is particularly important as it occurs in approximately half of patients with BRAF-mutant metastatic NSCLC.4 Further, this mutation represents up to 90% of BRAF mutations in melanoma5 and more than doubles the risk of mortality for patients with CRC.6 In addition to our continued investigation of BRAFTOVI + MEKTOVI for BRAF-mutant cancers, Pfizer is also exploring a next-generation BRAF inhibitor designed to selectively inhibit mutant BRAF monomers and mutant BRAF-containing dimers and be brain penetrant. The investigational drug is currently being evaluated in a Phase 1 clinical study.
Pfizer has exclusive rights to BRAFTOVI + MEKTOVI in the U.S., Canada, and all countries in Latin America, Africa and the Middle East. Ono Pharmaceutical Co., Ltd. has exclusive rights to commercialize both products in Japan and South Korea, Medison has exclusive rights in Israel, and Pierre Fabre Laboratories has exclusive rights in all other countries, including Europe and Asia-Pacific (excluding Japan and South Korea). The PHAROS trial is conducted with support from Pierre Fabre Laboratories.
INDICATION AND USAGE
BRAFTOVI (encorafenib) and MEKTOVI (binimetinib) are kinase inhibitors indicated for use in combination for the treatment of patients with unresectable or metastatic melanoma with a BRAF V600E or V600K mutation, as detected by an FDA-approved test.
BRAFTOVI is indicated, in combination with cetuximab, for the treatment of adult patients with metastatic colorectal cancer (CRC) with a BRAF V600E mutation, as detected by an FDA-approved test, after prior therapy.
BRAFTOVI and MEKTOVI are kinase inhibitors indicated for use in combination for the treatment of adult patients with metastatic non-small cell lung cancer (NSCLC) with a BRAF V600E mutation, as detected by an FDA-approved test.
Limitations of Use: BRAFTOVI is not indicated for treatment of patients with wild-type BRAF melanoma, wild-type BRAF CRC, or wild-type BRAF NSCLC.
IMPORTANT SAFETY INFORMATION
This information applies to the safety of BRAFTOVI when used in combination with either MEKTOVI or cetuximab.
WARNINGS AND PRECAUTIONS
New Primary Malignancies: New primary malignancies, cutaneous and non-cutaneous, can occur. BRAFTOVI may promote malignancies associated with activation of RAS through mutation or other mechanisms. Perform dermatopathologic evaluations prior to initiating treatment, every 2 months during treatment, and for up to 6 months following discontinuation of treatment. Manage suspicious skin lesions with excision and dermatopathologic evaluation. Dose modification is not recommended for new primary cutaneous malignancies. Monitor patients receiving BRAFTOVI for signs and symptoms of non-cutaneous malignancies. Discontinue BRAFTOVI for RAS mutation-positive non-cutaneous malignancies. Monitor patients for new malignancies prior to initiation of treatment, while on treatment, and after discontinuation of treatment.
BRAF-mutant type (BRAF-mt) metastatic melanoma (COLUMBUS study): Cutaneous squamous cell carcinoma (cuSCC), including keratoacanthoma (KA), occurred in 2.6% and basal cell carcinoma occurred in 1.6% of patients receiving BRAFTOVI with MEKTOVI. Median time to first occurrence of cuSCC/KA was 5.8 months.
BRAF-mt metastatic CRC (BEACON CRC study): cuSCC, including KA, occurred in 1.4% of patients with CRC, and a new primary melanoma occurred in 1.4% of patients who received BRAFTOVI with cetuximab.
BRAF-mt metastatic NSCLC (PHAROS study): cuSCC and skin papilloma (SP), each occurred in 2% of patients.
Tumor Promotion in BRAF Wild-Type Tumors: In vitro experiments have demonstrated paradoxical activation of MAP-kinase signaling and increased cell proliferation in BRAF wild-type cells exposed to BRAF inhibitors. Confirm evidence of BRAF V600E or V600K mutation using an FDA-approved test prior to initiating BRAFTOVI.
Cardiomyopathy: Cardiomyopathy manifesting as left ventricular dysfunction associated with symptomatic or asymptomatic decreases in ejection fraction, has been reported. Patients with cardiovascular risk factors should be monitored closely. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
Assess left ventricular ejection fraction (LVEF) by echocardiogram or multi-gated acquisition (MUGA) scan prior to initiating treatment, 1 month after initiating treatment, and then every 2 to 3 months during treatment.
The safety has not been established in patients with a baseline ejection fraction that is either below 50% or below the institutional lower limit of normal (LLN).
BRAF-mt metastatic melanoma (COLUMBUS study): Evidence of cardiomyopathy occurred in 7% and Grade 3 left ventricular dysfunction occurred in 1.6% of patients receiving BRAFTOVI with MEKTOVI. The median time to first occurrence of left ventricular dysfunction (any grade) was 3.6 months. Cardiomyopathy resolved in 87% of patients.
BRAF-mt metastatic NSCLC (PHAROS study): Evidence of cardiomyopathy occurred in 11% and Grade 3 left ventricular dysfunction occurred in 1% of patients. Cardiomyopathy resolved in 82% of patients.
Hepatotoxicity: Hepatotoxicity can occur. Monitor liver laboratory tests before initiation, monthly during treatment, and as clinically indicated. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
BRAF-mt metastatic melanoma (COLUMBUS study): The incidence of Grade 3 or 4 increases in liver function laboratory tests in patients receiving MEKTOVI with BRAFTOVI was 6% for alanine aminotransferase (ALT), 2.6% for aspartate aminotransferase (AST), and 0.5% for alkaline phosphatase.
BRAF-mt metastatic NSCLC (PHAROS study): The incidence of Grade 3 or 4 increases in liver function laboratory tests was 10% for AST, 9% for ALT, and 3.2% for alkaline phosphatase.
Hemorrhage: Hemorrhage can occur when BRAFTOVI is administered in combination with MEKTOVI or cetuximab. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
BRAF-mt metastatic melanoma (COLUMBUS study): Hemorrhage occurred in 19% of patients receiving BRAFTOVI with MEKTOVI and Grade 3 or higher hemorrhage occurred in 3.2% of patients. The most frequent hemorrhagic events were gastrointestinal, including rectal hemorrhage (4.2%), hematochezia (3.1%), and hemorrhoidal hemorrhage (1%). Fatal intracranial hemorrhage in the setting of new or progressive brain metastases occurred in 1.6% of patients.
BRAF-mt metastatic CRC (BEACON CRC study): Hemorrhage occurred in 19% of patients receiving BRAFTOVI with cetuximab; Grade 3 or higher hemorrhage occurred in 1.9% of patients, including fatal gastrointestinal hemorrhage in 0.5% of patients. The most frequent hemorrhagic events were epistaxis (6.9%), hematochezia (2.3%), and rectal hemorrhage (2.3%).
BRAF-mt metastatic NSCLC (PHAROS study): Hemorrhage occurred in 12% of patients including fatal intracranial hemorrhage (1%); Grade 3 or 4 hemorrhage occurred in 4.1% of patients. The most frequent hemorrhagic events were anal hemorrhage and hemothorax (2% each).
Uveitis: Uveitis, including iritis and iridocyclitis, has been reported in patients treated with BRAFTOVI with MEKTOVI. Assess for visual symptoms at each visit. Perform an ophthalmological evaluation at regular intervals and for new or worsening visual disturbances, and to follow new or persistent ophthalmologic findings. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
BRAF-mt metastatic melanoma (COLUMBUS study): The incidence of uveitis among patients treated with BRAFTOVI with MEKTOVI was 4%.
BRAF-mt metastatic NSCLC (PHAROS study): The incidence of uveitis among patients treated with BRAFTOVI with MEKTOVI was 1%.
QT Prolongation: BRAFTOVI is associated with dose-dependent QTc interval prolongation in some patients. Monitor patients who already have or who are at significant risk of developing QTc prolongation, including patients with known long QT syndromes, clinically significant bradyarrhythmias, severe or uncontrolled heart failure and those taking other medicinal products associated with QT prolongation. Correct hypokalemia and hypomagnesemia prior to and during BRAFTOVI administration. Withhold, reduce dose, or permanently discontinue for QTc >500 ms.
BRAF-mt metastatic melanoma (COLUMBUS study): An increase in QTcF to >500 ms was measured in 0.5% (1/192) of patients who received BRAFTOVI with MEKTOVI.
BRAF-mt metastatic NSCLC (PHAROS study): An increase in QTcF to >500 ms was measured in 2.1% (2/95) of patients who received BRAFTOVI with MEKTOVI.
Embryo-Fetal Toxicity: Both BRAFTOVI and MEKTOVI can cause fetal harm when administered to a pregnant woman. BRAFTOVI can render hormonal contraceptives ineffective.
BRAF-mt metastatic melanoma (COLUMBUS study) and BRAF-mt metastatic NSCLC (PHAROS study): Effective, non-hormonal contraceptives should be used during treatment and for at least 30 days after the final dose for patients taking BRAFTOVI with MEKTOVI.
BRAF-mt metastatic CRC (BEACON CRC study): Advise females of reproductive potential to use effective nonhormonal contraception during treatment with BRAFTOVI and for 2 weeks after the final dose.
BRAFTOVI as a Single Agent is associated with increased risk of certain adverse reactions compared to when BRAFTOVI is used with MEKTOVI.
BRAF-mt metastatic melanoma (COLUMBUS study): Grades 3 or 4 dermatologic reactions occurred in 21% of patients receiving BRAFTOVI as a single agent compared to 2% in patients receiving the combination of BRAFTOVI with MEKTOVI.
If MEKTOVI is temporarily interrupted or permanently discontinued, reduce the dose of BRAFTOVI as recommended.
Risks Associated with Combination Treatment
In BRAF-mt metastatic melanoma (COLUMBUS study), BRAFTOVI is used in combination with MEKTOVI so refer to the prescribing information for MEKTOVI for additional risk information.
In BRAF-mt metastatic CRC (BEACON CRC study), BRAFTOVI is used in combination with cetuximab so refer to the prescribing information for cetuximab for additional risk information.
In BRAF-mt metastatic NSCLC (PHAROS study), BRAFTOVI is indicated for use as part of a regimen in combination with MEKTOVI, so refer to the prescribing information for MEKTOVI for additional risk information.
Additional WARNINGS AND PRECAUTIONS for MEKTOVI When Used With BRAFTOVI
Venous Thromboembolism (VTE): VTE occurred in 6% of patients with BRAF-mt metastatic melanoma (COLUMBUS study), including 3.1% of patients who developed pulmonary embolism. VTE occurred in 7% of patients with BRAF-mt metastatic NSCLC (PHAROS study), including 1% of patients who developed pulmonary embolism. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
Other Ocular Toxicities
Serous retinopathy
Assess for visual symptoms at each visit. Perform an ophthalmologic examination at regular intervals, for new or worsening visual disturbances, and to follow new or persistent ophthalmologic findings. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
BRAF-mt metastatic melanoma (COLUMBUS study): serous retinopathy occurred in 20% of patients receiving MEKTOVI with BRAFTOVI; 8% were retinal detachment and 6% were macular edema. Symptomatic serous retinopathy occurred in 8% of patients with no cases of blindness. The median time to onset of the first event of serous retinopathy (all grades) was 1.2 months.
BRAF-mt metastatic NSCLC (PHAROS study): serous retinopathy (retinal detachment) occurred in 2% of patients with no cases of blindness.
Retinal vein occlusion (RVO) is a known class-related adverse reaction of MEK inhibitors and may occur in patients receiving MEKTOVI with BRAFTOVI. In BRAF-mt metastatic melanoma (COLUMBUS study), 1 patient experienced RVO (0.1%) in the MEKTOVI with BRAFTOVI group (n=690).
The safety of MEKTOVI has not been established in patients with a history of RVO or current risk factors for RVO, including uncontrolled glaucoma or a history of hyperviscosity or hypercoagulability syndromes.
Perform ophthalmological evaluation for patient-reported acute vision loss or other visual disturbance within 24 hours. Permanently discontinue MEKTOVI in patients with documented RVO.
Interstitial Lung Disease (ILD): ILD, including pneumonitis, occurred in 0.3% (2 of 690 patients) with BRAF-mt metastatic melanoma (COLUMBUS study) receiving MEKTOVI with BRAFTOVI. One patient (1%) with BRAF-mt metastatic NSCLC (PHAROS study) receiving MEKTOVI with BRAFTOVI developed pneumonitis. Assess new or progressive unexplained pulmonary symptoms or findings for possible ILD. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
Rhabdomyolysis: Rhabdomyolysis can occur when MEKTOVI is taken with BRAFTOVI. Monitor creatine phosphokinase (CPK) and creatinine levels prior to initiating MEKTOVI, periodically during treatment, and as clinically indicated. Withhold, reduce dose, or permanently discontinue based on severity of adverse reaction.
BRAF-mt metastatic melanoma (COLUMBUS study): Elevation of laboratory values of serum CPK occurred in 58% of patients receiving MEKTOVI with BRAFTOVI. Rhabdomyolysis was reported in 0.1% (1 of 690 patients) with BRAF mutation-positive melanoma receiving MEKTOVI with BRAFTOVI.
BRAF-mt metastatic NSCLC (PHAROS study): Elevation of laboratory values of serum creatine kinase (CK) occurred in 41% of patients. No patient experienced rhabdomyolysis.
ADVERSE REACTIONS
BRAF-mt Metastatic Melanoma (COLUMBUS study)
Most common adverse reactions (≥20%, all grades) for patients receiving BRAFTOVI with MEKTOVI compared to vemurafenib were fatigue (43% vs 46%), nausea (41% vs 34%), diarrhea (36% vs 34%), vomiting (30% vs 16%), abdominal pain (28% vs 16%), arthralgia (26% vs 46%), myopathy (23% vs 22%), hyperkeratosis (23% vs 49%), rash (22% vs 53%), headache (22% vs 20%), constipation (22% vs 6%), visual impairment (20% vs 4%), serous retinopathy/RPED (20% vs 2%).
Other clinically important adverse reactions occurring in <10% of patients who received BRAFTOVI with MEKTOVI were facial paresis, pancreatitis, panniculitis, drug hypersensitivity, and colitis.
Most common laboratory abnormalities (≥20%, all grades) for BRAFTOVI with MEKTOVI compared to vemurafenib included increased creatinine (93% vs 92%), increased CPK (58% vs 3.8%), increased gamma glutamyl transferase (GGT) (45% vs 34%), anemia (36% vs 34%), increased ALT (29% vs 27%), hyperglycemia (28% vs 20%), increased AST (27% vs 24%), and increased alkaline phosphatase (21% vs 35%).
BRAF-mt Metastatic CRC (BEACON CRC study)
Most common adverse reactions (≥25%, all grades) in patients receiving BRAFTOVI with cetuximab compared to irinotecan with cetuximab or FOLFIRI with cetuximab (control) were fatigue (51% vs 50%), nausea (34% vs 41%), diarrhea (33% vs 48%), dermatitis acneiform (32% vs 43%), abdominal pain (30% vs 32%), decreased appetite (27% vs 27%), arthralgia (27% vs 3%), and rash (26% vs 26%).
Other clinically important adverse reactions occurring in <10% of patients who received BRAFTOVI with cetuximab was pancreatitis.
Most common laboratory abnormalities (≥20%, all grades) in the BRAFTOVI with cetuximab arm compared to irinotecan with cetuximab or FOLFIRI with cetuximab (control) were: anemia (34% vs 48%) and lymphopenia (24% vs 35%).
BRAF-mt Metastatic NSCLC (PHAROS study)
Most common adverse reactions (≥25%, all grades) in patients receiving BRAFTOVI with MEKTOVI were fatigue (61%), nausea (58%), diarrhea (52%), musculoskeletal pain (48%), vomiting (37%), abdominal pain (32%), visual impairment (29%), constipation (27%), dyspnea (27%), rash (27%), and cough (26%).
Serious adverse reactions occurred in 38% of patients receiving BRAFTOVI with MEKTOVI. Serious adverse reactions occurring in ≥2% of patients were hemorrhage (6%), diarrhea (4.1%), anemia (3.1%), dyspnea (3.1%), pneumonia (3.1%), arrhythmia (2%), device related infection (2%), edema (2%), myocardial infarction (2%), and pleural effusion (2%).
Fatal adverse reactions occurred in 2% of patients, including intracranial hemorrhage (1%) and myocardial infarction (1%).
Other clinically important adverse reactions occurring in <10% of patients who received BRAFTOVI with MEKTOVI were peripheral neuropathy, dysgeusia, facial paresis, pancreatitis, hyperkeratosis, erythema, and drug hypersensitivity.
Most common laboratory abnormalities (≥20%, all grades) for BRAFTOVI and MEKTOVI included increased creatinine (91%), hyperglycemia (48%), anemia (47%), increased creatine kinase (41%), lipase increased (40%), increased ALT (34%), hypoalbuminemia (32%), increased alkaline phosphatase (31%), increased AST (31%), hyperkalemia (31%), hyponatremia (26%), lymphopenia (24%), serum amylase increased (22%), and thrombocytopenia (20%).
DRUG INTERACTIONS With BRAFTOVI When Used in Combination With Either MEKTOVI or Cetuximab
Avoid coadministration of BRAFTOVI with strong or moderate CYP3A4 inhibitors (including grapefruit juice) or CYP3A4 inducers and use caution with sensitive CYP3A4 substrates. Avoid coadministration of BRAFTOVI with hormonal contraceptives.
Modify BRAFTOVI dose if coadministration with a strong or moderate CYP3A4 inhibitor cannot be avoided.
Avoid coadministration of BRAFTOVI with drugs known to prolong QT/QTc interval.
Dose reductions of drugs that are substrates of OATP1B1, OATP1B3, or BCRP may be required when used concomitantly with BRAFTOVI.
Lactation: Advise women not to breastfeed during treatment with BRAFTOVI and MEKTOVI and for 2 weeks after the final dose.
Infertility: Advise males of reproductive potential that BRAFTOVI may impair fertility.
For BRAF-mt metastatic melanoma and for BRAF-mt metastatic NSCLC, see full Prescribing Information and Medication Guide for BRAFTOVI and full Prescribing Information and Medication Guide for MEKTOVI. See full Prescribing Information for BRAFTOVI and for MEKTOVI for dose modifications for adverse reactions. There may be a delay as the documents are updated with the latest information. They will be available as soon as possible. Please check back for the updated full information shortly.
For BRAF-mt metastatic CRC, see full Prescribing Information and Medication Guide for BRAFTOVI. See full Prescribing Information for BRAFTOVI for dose modifications for adverse reactions. Refer to cetuximab prescribing information for recommended dosing and safety information.