The British star visited his doctor in December (14) for a check-up, when a cancerous growth was spotted in its early stages which led to the singer undergoing a course of chemotherapy and radiotherapy.
In a statement, the heavy metal band insist experts are hopeful DICkinson will make a full recovery when he is reassessed in May (15).
The announcement reads, "Just before Christmas, Maiden vocalist Bruce DICkinson visited his doctor for a routine check-up. This led to tests and biopsies which revealed a small cancerous tumour at the back of his tongue. A seven-week course of chemotherapy and radiology treatment was completed yesterday.
"As the tumour was caught in the early stages, the prognosis thankfully is extremely good. Bruce's medical team fully expect him to make a complete recovery with the all clear envisaged by late May. It will then take a further few months for Bruce to get back to full fitness. In the meantime, we would ask for your patience, understanding and respect for Bruce and his family's privacy until we update everyone by the end of May. Bruce is doing very well considering the circumstances and the whole team are very positive."