AstraZeneca's (AZN) TAGRISSO T790M Companion Diagnostic Test Approved by U.S. FDA

September 29, 2016 7:03 AM EDT

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AstraZeneca (NYSE: AZN) announced that the US Food and Drug Administration (FDA) has approved a blood-based companion diagnostic for TAGRISSO® (osimertinib). The companion diagnostic for TAGRISSO is the only FDA-approved and clinically validated companion diagnostic test that uses either tissue or a blood sample to confirm the presence of a T790M mutation in patients with metastatic epidermal growth factor receptor (EGFR) mutation-positive non-small cell lung cancer (NSCLC), who have progressed on or after an EGFR tyrosine kinase inhibitor (TKI) medicine.

The approval provides a new, non-invasive option to identify patients with metastatic EGFR T790M mutation-positive NSCLC, ensuring that those patients who may not be suitable for biopsy procedures have an opportunity to be tested. Blood-based testing for the presence of the mutation is recommended only when a tumor biopsy cannot be obtained. Patients who test negative for the T790M mutation with the blood-based test, and their physicians, should re-evaluate the feasibility of tissue-based testing to confirm the presence of the EGFR T790M mutation.

The companion diagnostic, cobas® EGFR Mutation Test v2, was developed by Roche Molecular Systems. The test enables identification of patients who have the T790M mutation at disease progression, and is initially available through Baystate Health, Carolinas HealthCare System, Laboratory Corporation of America® Holdings (LabCorp®), and PhenoPath.

“Blood-based testing has the potential to rapidly identify patients eligible for targeted therapy, who may not be eligible for biopsy. Availability of this blood-based test may help aid treatment decisions,” said Balazs Halmos, MD, Montefiore Medical Park, Albert Einstein College of Medicine.

“The availability of an FDA-approved, blood-based companion diagnostic is a tremendous step forward for patients with lung cancer in need of a high-quality test that provides results with a rapid turnaround time. This development offers an important option for the identification of the T790M mutation in patients with metastatic EGFR mutation-positive NSCLC who have progressed on an EGFR TKI medicine, for whom a tissue biopsy may not be feasible,” said Andrew Coop, Vice President, US Medical Affairs, Oncology, AstraZeneca. “Delivering targeted therapies, such as TAGRISSO, to the right patients at the right time demonstrates our commitment to testing and quality companion diagnostics.”

Nearly two-thirds of cases of progression with first-generation EGFR TKIs are related to an acquired EGFR T790M mutation — for which there have been limited treatment options in the past. TAGRISSO is the only FDA-approved targeted medicine for the treatment of patients with metastatic EGFR T790M mutation-positive NSCLC who have progressed on or after an EGFR TKI medicine, and was approved by the FDA in November 2015. This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trials.

The TAGRISSO tolerability profile showed that no individual severe grade 3+ adverse events occurred at ≥ 3.5%. The most common adverse events were generally mild to moderate and included diarrhea (42% all grades; 1.0% grade 3/4), rash (41% all grades; 0.5% grade 3/4), dry skin (31% all grades; 0% grade 3/4), and nail toxicity (25% all grades; 0% grade 3/4).

Important Safety Information About TAGRISSO® (osimertinib)

  • There are no contraindications for TAGRISSO.
  • Interstitial Lung Disease (ILD)/Pneumonitis occurred in 3.3% and were fatal in 0.5% of 813 TAGRISSO patients. Withhold TAGRISSO and promptly investigate for ILD in any patient presenting with worsening of respiratory symptoms indicative of ILD (e.g., dyspnea, cough and fever). Permanently discontinue TAGRISSO if ILD is confirmed
  • QTc interval prolongation occurred in TAGRISSO patients. Of the 411 patients in two Phase II studies, 0.2% were found to have a QTc greater than 500 msec, and 2.7% had an increase from baseline QTc greater than 60 msec. Conduct periodic monitoring with ECGs and electrolytes in patients with congenital long QTc syndrome, congestive heart failure, electrolyte abnormalities, or those who are taking medications known to prolong the QTc interval. Permanently discontinue TAGRISSO in patients who develop QTc interval prolongation with signs/symptoms of life threatening arrhythmia
  • Cardiomyopathy occurred in 1.4% and were fatal in 0.2% of 813 TAGRISSO patients. Left Ventricular Ejection Fraction (LVEF) decline >10% and a drop to <50% occurred in 2.4% of (9/375) TAGRISSO patients. Assess LVEF before initiation and then at 3 month intervals of treatment. Withhold TAGRISSO if ejection fraction decreases by 10% from pretreatment values and is less than 50%. For symptomatic congestive heart failure or persistent asymptomatic LV dysfunction that does not resolve within 4 weeks, permanently discontinue TAGRISSO.
  • Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during TAGRISSO treatment and for 6 weeks after the final dose. Advise males with female partners of reproductive potential to use effective contraception for 4 months after the final dose.
  • The most common adverse reactions (>20%) observed in TAGRISSO patients were diarrhea (42%), rash (41%), dry skin (31%) and nail toxicity (25%).

TAGRISSO is indicated for the treatment of patients with metastatic epidermal growth factor receptor (EGFR) T790M mutation-positive non-small cell lung cancer (NSCLC), as detected by an FDA-approved test, who have progressed on or after EGFR tyrosine kinase inhibitor therapy.

This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trials.

Please see accompanying complete Prescribing Information including Patient Information.



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