Cytogenetic study on eleven cutaneous neoplasms and two pre‐tumoral lesions from xeroderma pigmentosum patients

Abstract
Eleven independent tumors (5 basal-cell carcinomas, 5 squamous-cell carcinomas and 1 malignant melanoma), 2 pre-tumoral lesions and one common nevus, developing in the skin of 10 unrelated XP patients were cytogenetically analyzed. No specific chromosomal changes were observed. Two features were relevant, however: emergence of several independent clones and over-involvement of telomeric and cen-tromeric regions in the formation of chromosomal rearrangements, jumping translocations were observed in 2 squamous-cell carcinomas involving telomeric and centromeric regions.