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3014 Background: Dendrimer nanoparticles enable prolonged cytotoxic drug targeting to tumors. DEP SN38 is a water-soluble version of SN38, the active metabolite of irinotecan, attached to a dendrimer, so avoiding usual metabolic pathways of conventional irinotecan (c-IRI). This phase 1/2 (P1/2) trial evaluated safety, tolerability and efficacy of DEP SN38 in pts with advanced solid tumors, including colorectal (CRC), platinum-resistant high-grade serous ovarian (HGSOC) and breast (BC). Methods: Pts who had exhausted standard therapy were enrolled in dose assessment (P1)/dose expansion (P2) cohorts of DEP SN38 given IV 3-weekly (Q3W) or Q2W alone or in combination with 5-fluorouracil with 1 pt achieving complete tumor & ascites resolution. Reduced CA-125 of up to 98% was observed in 75% pts. Several HGSOC pts continue DEP SN38 treatment. 8 BC pts with a mean of 7 prior lines received DEP SN38 monotherapy Q3W (5 evaluable). The DCR was 100% with SD up to 72 wks. Conclusions: DEP SN38 shows promising clinical utility with encouraging antitumor activity including prolonged disease control & durable PRs in heavily pre-treated CRC, HGSOC & BC pts. DEP SN38 is well-tolerated with significantly fewer severe gastrointestinal TRAEs compared to c-IRI, & warrants further clinical assessment. Clinical trial information: 2019-001318-40 .
Liu et al. (Sat,) studied this question.