Sentence: Previous treatments with rituximab and with rituximab plus high dose glucocorticoids , as well as with cyclophosphamide , azathioprine , plasma exchange , hyperbaric therapy , VAC therapy , prostacyclin , mycophenolate mofetil and surgery , had previously failed .
Drug combination annotation:
[{'class': 'NEG', 'spans': ['rituximab', 'glucocorticoids'], 'is_context_needed': False}, {'class': 'NEG', 'spans': [1, 2], 'is_context_needed': False}, {'class': 'NEG', 'spans': [1, 3], 'is_context_needed': False}]