A 60-year-old man just now had the 3rd recurrence of NHL in last 4 yrs all on the right side of the body. 1st occurrence at the base of a right side of the nose. 1st recurrence in the right   arm. 2nd recurrence in the right   leg. 3rd recurrence now in the right thigh. Question is Why always on the right side?

Should gene study to be done? Any way to prevent? Isn't it associated with some cancer syndrome like Beckwith Weidmann? He was completely cured of TMH in Kolkatta a few months back by chemotherapy/radiotherapy.