Ford will now undergo 27 straight days of radiation to attack a tumour in his abdomen.
He said last month that five rounds of chemotherapy have managed to shrink the size of the mass from 13 cm to about 6 cm.
Rob Ford was diagnosed with a rare and aggressive form of abdominal cancer in mid-September and dropped his bid for mayoral re-election shortly afterwards.
Instead, he ran for a seat on city council and was voted in during the Oct. 27 municipal election.
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