He had surgery on the island in June and returned last month for treatment.
Mr Chavez had a tumour removed in Cuba in June and has since had chemotherapy, but the exact nature of his cancer has not been disclosed.
He has said his treatment is going well, but the illness has raised doubts about whether he will be able to stand for re-election next year as planned.
Addressing crowds on his 57th birthday on 28 July, President Chavez declared that he was aiming for victory.
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