1.   ...transplanted organs such as hearts and kidneys.

2.   As more doctors learn how to transplant organs, more patients demand organ transplants.

3.   Before transplanting an organ in any person with cancer, surgeons must try to determine whether the cancer is confined to the organ that is being removed.

4.   But when the organ is transplanted, those same defenders antagonize the immune system of the recipient, touching off a fierce rejection.

5.   Currently, xenotransplanation -- transplanting non-human organs into humans -- often leads to rejection of the organs because antibodies develop to fight the alien substance.

6.   Doctors are reluctant to transplant organs into someone with a complicated illness, fearing the patient will not survive.

7.   How many organs can be transplanted?

8.   It may also one day make it possible to transplant organs between mismatched individuals by reducing or even eliminating the risk of rejection.

9.   It was the first time in New England that three organs were transplanted simultaneously, said Dr. David J. Sugarbaker, chief of thoracic surgery.

10.   Nextran, of Princeton, N.J., a subsidiary of Baxter Healthcare, is also working on transplanting pig organs to humans.