51.   Aguiar must undergo CAT scans every six months to determine whether the cancer has returned.

52.   But then his cancer returned and an investigation began last month to see if he had violated his probation.

53.   But the cancer sometimes returns in other parts of the body.

54.   But the cancer returned the following year.

55.   He began recovering last year, and doctors say there is a tiny chance the cancer will return.

56.   He had suffered from bone cancer, which was in remission when he came to Moscow, and his supporters fear the cancer could have returned.

57.   His doctors say there is a tiny chance the cancer will return.

58.   His family fears the cancer may have returned.

59.   His family fears that the cancer may have returned.

60.   His family fears the cancer has returned.