Cancer After Bone Marrow Transplant?
Bone Marrow Transplantation May Raise Cancer Risk, Study Shows
WebMD News Archive
Nov. 27, 2006 -- Cancer patients who get bone marrow transplants may be more
likely to get another cancer, a Canadian study shows.
Bone marrow transplants can save lives. The researchers -- who included
Donna Forrest, MD, of the British Columbia Cancer Agency -- aren't arguing
against those transplants.
Instead, Forrest's team says scientists need to do more work to understand
whether cancer risk rises after bone marrow transplantation.
The study appears in Cancer's online "Early View"
Data came from 926 patients who got bone marrow transplants at Vancouver
General Hospital, the British Columbia Cancer Agency, or the British Columbia
Children's Hospital between 1985 and 2003.
The patients were 12-65 years old (average age: 39). Most were adults; only
20 were younger than 18.
Most patients had leukemia. Their bone marrow transplants came from
their siblings or unrelated donors.
The patients got yearly checkups that included physical exams and blood
The patients were followed for up to 10 years. During that time, the vast
majority of patients didn't get a second cancer.
However, 28 patients developed another cancer. Those cancers developed seven
years, on average, after bone marrow transplantation.
The data don't prove that those cancers were tied to the bone marrow
transplants. Doctors often can't explain exactly why cancers develop.
Patients who got bone marrow transplants were 85% more likely to develop a
second solid cancer than the general public in British Columbia, the
That figure doesn't include the chance of getting nonmelanoma skin
cancer or carcinoma in situ of the cervix (the earliest stage of cervical
Further analysis showed that patients were more likely to develop another
cancer if they were at least 40 years old when they got their bone marrow
Cancer risk rises with age. The researchers don't know whether the higher
cancer risk in patients aged 40 and older was due to aging
or other factors.
The study also shows that patients were more likely to get another cancer if
their bone marrow donor was a woman.
That finding was "unexpected" and its explanation is
"uncertain," the researchers write.
They call for "extended follow-up" to gauge the chances of getting
cancer after bone marrow transplants.