Objectives: Patritumab is a fully human anti-human epidermal growth factor receptor 3 (HER3) antibody that blocks activation by its ligand, heregulin (HRG). Preclinical studies have demonstrated the efficacy of patritumab in aberrantly high HRG-expressing non-small cell lung cancer (NSCLC). In the phase II randomized, placebo-controlled double-blind study HERALD (n=212 patients with NSCLC), patritumab plus erlotinib did not improve progression-free survival (PFS) compared with placebo plus erlotinib. The current study examined whether soluble HRG (sHRG) level in serum correlated with the efficacy of patritumab plus erlotinib.
Materials And Methods: Serum was obtained from participants prior to treatment (n=202). sHRG level was measured using a validated quantitative immune assay, and correlations with survival were blindly assessed.
Results: sHRG level was various (-1346-11,772pg/mL). Participants were divided into the sHRG-high or -low subgroups at the concentration defining near the third quartile, 980pg/mL. Patritumab plus erlotinib significantly improved PFS relative to placebo in the sHRG-high subgroup (n=46, hazard ratio 0.42 [0.19-0.96], p=0.0327). In contrast, the HRG-low subgroup (n=148) had no improvement in PFS with patritumab.
Conclusion: sHRG seems to be a predictive biomarker for the efficacy of patritumab plus erlotinib in NSCLC patients.
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