This compared to 182 women who had not received radiation boosts.
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The chances of breast cancer recurring among this age group were cut by 54% if they received the radiation boost.
In one study, 637 patients received standard chemotherapy plus radiation, and half also received Avastin.
An acute dose is a relatively large amount of radiation received in a very short time period.
Doses of radiation received by people near the damaged power plant were so low that no discernible health effect could be expected.
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Nearly three years into the research, the rate of strokes and death was more than three times higher among participants who had received surgery, radiation or other invasive treatment than among patients given medication for headaches and other symptoms.
Daiichi employees have received the highest average radiation doses of those at any Japanese plant every year over the past decade.
About 20 more who received high doses of radiation died of various causes in the following years, and as many as 4, 000 cancer deaths are expected as a result of the disaster, according to those U.N. agencies.
After five years, 109 of the women who had received the extra dose of radiation had seen their tumours return.
Some experts said it was surprising that any increase in cancer was even predicted and believe that the low-dose radiation people in Fukushima received hasn't been proven to raise the chances of cancer.
"On the basis of the radiation doses people have received, there is no reason to think there would be an increase in cancer in the next 50 years, " said Wade Allison, an emeritus professor of physics at Oxford University, who was not connected to the WHO report.
If an astronaut had been on the Moon at the time, they might have received a 400 rem (Roentgen Equivalent Man) radiation dose.
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The only radiation events on this scale, where large populations received 0.1 Sv (10 rem) to 1 Sv (100 rem) have been the atomic bomb blasts from World War II.
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But according to follow-up studies reported by the Nuclear Regulatory Commission (NRC), the resulting average dose of radiation that about 2 million people in the TMI area received amounted to 1 millirem, six times less than exposure to a single standard chest x-ray.
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The team, led by radiation oncologist Benjamin Smith, said that was nearly double the 2.2% of women who received whole-breast irradiation.
Two of the three workers inside the plant received more than the lethal dose of seven sieverts (a sievert is the unit that measures the intensity of radiation's impact on the body).
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