“…Furthermore, the precise location of the mutation may add further information of prognostic value (Bergh et al, 1995;Borressen et al, 1995) and predict response to chemotherapy (Elledge et al, 1995;Aas et al, 1996). p53 protein expression has been identified as a predictor of disease recurrence (Iwaya et al, 1991;Barnes et al, 1993;Friedrichs et al, 1993;Marks et al, 1994), even for patients without nodal involvement at the time of diagnosis (Allred et al, 1993;Barnes et al, 1993;Silvestrini et al, 1993;MacGrogan et al, 1995) and for poor survival (Isola et al, 1992;Allred et al, 1993;Silvestrini et al, 1993;Received 12 March 1997 Revised 25 July 1997 Accepted 21 August 1997 Correspondence to: AM Thompson Elledge and Borg et al, 1995;MacGrogan et al, 1995;Silvestrini et al, 1996). Although molecular lesions at p53 and at YNZ22 loci occur independently (Coles et al, 1990), it is not clear to what extent allelic imbalance on chromosome 17p telomeric to the p53 locus may reflect direct or indirect involvement of p53 itself.…”