And when breast cancers did occur they tended to be larger tumours spreading to lymph nodes.
Twenty-eight had early colon cancer, 18 had adenomas, premalignant colon tumours and 28 had no disease.
According to an EU report, even small residues of oestradiol in meat may produce tumours.
The researchers trialled the test on genetically modified mice, which are highly susceptible to forming tumours.
This diversity helps tumours adapt to become untreatable and colonise new parts of the body.
They found a gene called SI00A4 was strongly associated with tumours in very young children.
Tamoxifen blocks the female sex hormone oestrogen that fuels the growth of some breast tumours.
BBC: Scientists find why tamoxifen fails some breast cancers
But in two patients the cells stuck it out, and in those two the tumours shrank.
The tumours were treated with two common components of chemotherapy - vinblastine or doxorubicin.
If these are successful they will then test the treatment on patients with BRCA-linked tumours.
Malignant tumours develop messier networks, which are characterised by a preponderance of small capillaries.
That may allow pre-emptive treatment to be developed for people whose tumours are not yet malignant.
ECONOMIST: The next advances in genomics may happen in China
They then observed tumours of the type this rat is known to be subject to.
Ominously for the statisticians, the recall errors of those with tumours increased with time.
But scientists still face the challenge of developing the necessary gene therapy and targeting tumours with it.
During his treatment the Venezuelan leader is reported to have had tumours removed from his pelvic region.
BBC: Hugo Chavez returns to Venezuela after Cuba cancer care
Dr DePinho himself will have more duties at MD Anderson than just dealing with the five chosen tumours.
It works not on the primary cancer but on one of its most dangerous consequences, secondary bone tumours.
They also found that patients who had relapsed after treatment had higher levels of S6K2 in their tumours.
Another thinks it really has found increased risks of certain tumours and wants to call for precautionary measures.
One believes any increased incidence of tumours shown in the study is purely the result of the biases.
However, he said that other bowel bacteria could also be behind the cell changes which eventually lead to tumours.
However, in cancer cells, the balance is tipped towards producing new cells and so aids the growth of tumours.
In mice, tumours disappeared in 10-14 days and the animals remained cancer-free thereafter.
By holding the patient's head completely still, radiographers can target tumours more precisely.
Not all tumours that develop with NF1 are benign - some are cancerous.
Blocking similar genes in human tumours, Dr Detmar said, could help prevent or at least reduce the likelihood of metastasis.
After five years, 109 of the women who had received the extra dose of radiation had seen their tumours return.
Researchers said their findings open up the possibility of developing drugs to monitor and control the growth of cancerous tumours.
Their claim is that the rats fed GM corn and Roundup got more such tumours earlier than the control group.
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