I. To determine the levels of expression of v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog (c-KIT), platelet-derived growth factor receptor (PDGFR), v-akt murine thymoma viral oncogene homolog 2 (AKT2), and phosphorylated (p)-AKT2 in archived, formalin-fixed, paraffin-embedded primary tumors collected prior to the initiation of first-line chemotherapy