Table 2.

Frequencies and distribution of hptc mutations in XP BCCs

Mutation information	No. (%)
Total alterations	19*
Deletion	2 (11%)
Type of base substitutions*
GC → AT	3 (17%)
AT → CG	1 (6%)
AT → TA	1 (6%)
CC → TT	11 (65%)
CC → AT	1 (6%)
Total	17
Substitution location
Py–Py site	17 (100%)
Non-Py–Py site	0
Py–Py site location
Transcribed strand	2 (12%)
Nontranscribed strand	15 (88%)

^*Tandem mutations were taken as one event.