In a phase 2 study of single-agent EC145 in heavily pretreated non-small cell lung cancer (NSCLC) patients (median of 3 prior chemotherapy regimens), the subgroup with all target lesions expressing the folate receptor [FR(++)] had a promising prolonged progression free survival of 7.1 months and overall survival of 10.9 months. Furthermore, in-vitro and in-vivo studies in KB models showed good synergism between EC145 and docetaxel.