The ace Indian marksman lost to his coach and had to settle for the silver medal in the double trap event at the Commonwealth Shooting Championships.
Marcello Dradi said he recently underwent a surgery after the cancer returned for the third time after remaining in remission for three years.
The Indian ace fired a total of 181 to win the gold in the men's double trap shooting event at the 18th Commonwealth Games.
Athens Olympics silver medallist Rajyavardhan Singh Rathore could battle it out with his coach, Australian Russel Mark, at next year's Commonwealth Shooting Championships.
But before that, says former Olympic Russell Mark, his coach since the last three months, he'll be World champion.