Sentence: A total of 34 patients with androgen-independent prostate cancer received doxorubicin , 30 mg/m(2 ) , every 2 weeks and ketoconazole daily , 400 mg orally every 8 hours .
Drug combination annotation:
[{'class': 'POS', 'spans': ['doxorubicin', 'ketoconazole'], 'is_context_needed': True}]