Results of mutational analysis of tumors for ras codon 12 and 13 and braf. DNA was extracted from formalin fixed paraffin embedded tissue, PCR amplified, and analyzed by pyrosequencing. Panel a: Sample from patient in first dose cohort, showing the wild type ras sequence, GGT. Panel b: Sample from the patient with breast cancer who experienced a partial response (# 501-Table 4), showing the mutated ras sequence, GCT. Panel c: Sample from patient in first dose cohort, showing the wild type braf sequence, GTG. Panel D: Sample from the patient with breast cancer (# 502-Table 4), showing the mutated braf sequence GAG