Sentence: The aim of this study was to evaluate three active agents , bleomycin ( BLM ) , epirubicin and carboplatin in a new combination ( BECA ) in terms of feasibility , activity and toxicity in patients with recurrent and metastatic squamous cell carcinoma of the head and neck .
Drug combination annotation:
[{'class': 'POS', 'spans': ['bleomycin', 'epirubicin', 'carboplatin'], 'is_context_needed': True}]