"I've spent my career specializing in the care of patients with metastatic urothelial carcinoma and understand the need for new treatments for this disease," said Arlene O. Siefker-Radtke, M.D., professor of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, and lead study investigator. "BALVERSA is an important new therapy for this small subset of patients with urothelial carcinoma who, up until now, had limited treatment options."
BALVERSA, a once-daily oral FGFR kinase inhibitor, received accelerated approval based on results from a Phase 2 clinical trial (BLC2001, NCT02365597), a multicenter, open-label, single-arm study, of 87 patients with disease that had progressed on or after at least one prior chemotherapy and that had at least one of the following genetic alterations: FGFR3 gene mutations (R248C, S249C, G370C, Y373C) or FGFR gene fusions (FGFR3-TACC3, FGFR3-BAIAP2L1, FGFR2-BICC1, FGFR2-CASP7), as determined by a clinical trial assay performed at a central laboratory.1 The results demonstrated a 32.2 percent objective response rate (ORR) as assessed by Blinded Independent Review Committee (BIRC) [95% CI(22.4, 42.0)].1 Responders included patients who had previously not responded to anti PD-L1/PD-1 therapy.1 In the trial, ORR was defined as the percentage of patients with measurable lesions achieving a complete response (CR) [2.3 percent] or partial response (PR) [29.9 percent]1 to treatment using the Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST v1.1) criteria, a standard way to measure how well a patient responds to treatment based on whether tumors shrink, stay the same, or get bigger as assessed per investigator.2 Results also showed a median duration of response (DoR) of 5.4 months [95% CI(4.2, 6.9)] in patients treated with BALVERSA.1 There were no confirmed responses to BALVERSA in the FGFR2 fusion patient population (n=6).1 Data from the BLC2001 study were presented at the American Society of Clinical Oncology (ASCO) 2018 Annual Meeting (Abstract #4503) and were recognized as a "Best of ASCO" selection.
Warnings and Precautions include Ocular Disorders, Hyperphosphatemia and Embryo-fetal Toxicity.1 The most common adverse reactions (ARs) including laboratory abnormalities >20% were phosphate increased (76%), stomatitis (56%), fatigue (54%), creatinine increased (52%), diarrhea (47%), dry mouth (45%), onycholysis (41%), alanine aminotransferase increased (41%), alkaline phosphatase increased (41%), sodium decreased (40%), decreased appetite (38%), albumin decreased (37%), dysgeusia (37%), hemoglobin decreased (35%), dry skin (34%), aspartate aminotransferase increased (30%), magnesium decreased (30%), dry eye (28%), alopecia (26%), palmar-plantar erythrodysesthesia syndrome (26%), constipation (28%), phosphate decreased (24%), abdominal pain (23%), calcium increased (22%), nausea (21%), and musculoskeletal pain (20%). The most common Grade 3 or greater ARs (>1%) were stomatitis (9%), nail dystrophy*, palmar-plantar erythrodysesthesia syndrome (6%), paronychia (3%), nail disorder*, keratitis^, onycholysis (10%*) and hyperphosphatemia. (*Included within onycholysis. ^Included within dry eye.)1
The FDA simultaneously approved a companion diagnostic for use with BALVERSA, the QIAGEN therascreen® FGFR RGQ Reverse-transcription (RT)-polymerase chain reaction (PCR) Kit, which is the first PCR-based companion diagnostic approved to detect FGFR alterations. The therascreen® FGFR test detects the presence of FGFR alterations in the tumor tissue of patients with mUC.1 If one or more of the genetic alterations or fusions are detected, the patient may be a candidate for treatment with BALVERSA.
Janssen is offering BALVERSA and associated patient services through a single source specialty pharmacy provider, US Bioservices. This model is part of Janssen's ongoing commitment to provide high-quality products, services, access, and support to healthcare professionals and patients.
"We recognize the significant unmet need that persists in the treatment of men and women diagnosed with this form of urothelial carcinoma, and we have worked expeditiously to develop BALVERSA for patients in close consultation with the FDA," said Peter Lebowitz, M.D., Ph.D., Global Therapeutic Area Head, Oncology, Janssen Research & Development, LLC. "We look forward to the continued development of BALVERSA to understand how this important new therapy may further inform the care of patients with metastatic urothelial carcinoma and its investigational use in other cancers where FGFR alterations may be present in the future.""The FDA approval of BALVERSA represents our commitment to deliver much-needed therapies for devastating diseases, including metastatic urothelial carcinoma where there is a lack of therapeutic options," said Mathai Mammen, M.D., Ph.D., Global Head, Janssen Research & Development, LLC. "We are also pleased to see the simultaneous FDA approval of a companion diagnostic with BALVERSA, which will offer a more personalized approach to therapy for healthcare professionals to treat their patients."
References:
1. BALVERSA Prescribing Information.
Further Related Content: Erdafitinib, a Pan-fibroblast Growth Factor Receptor Inhibitor, in Patients with Metastatic or Unresectable Urothelial Carcinoma and FGFR Alterations