Both irinotecan and semaxanib could be given at their full single-agent recommended doses without significant toxicity, and the combination showed signs of clinical activity. However, owing to discouraging results from Phase III trials, it is unlikely that this combination will be further explored.
The combination of irinotecan and oxaliplatin is safe and apparently active in the treatment of MCC patients. The recommended dose for phase II studies is 175 mg/m(2) irinotecan plus 130 mg/m(2) oxaliplatin, given every 3 weeks. Neutropenia and delayed recovery of neutrophil counts are the predominant early toxicities with this schedule.
3579 Background: Irinotecan (I) plus bolus 5-FU (F) and leucovorin (L) comprise the IFL regimen, a very active treatment in mCRC when combined with bevacizumab (B). The response rate (RR) for IFL-B given as first-line treatment is 45%, with a median progression-free survival (PFS) of 10.6 months and a median survival of 20.3 months. The IFL regimen is now considered inferior to infusional 5-FU regimens, such as FOLFIRI, which have less toxicity and improved efficacy. Methods: We designed a 43 patient (pt), single-arm phase II trial of FOLFIRI-B with B (5mg/kg), I (180mg/m2), bolus of F (400mg/m2) and L (400mg/m2) followed by a 46-hour infusion of F (2400mg/m2), with a primary endpoint of progression-free survival (PFS). Chemotherapy naïve mCRC patients (pts) with adequate organ function and performance status 0–2 received B alone on Day minus 14, starting FOLFIRI + B on Day 1. DCE-MRI and laboratory correlates were completed before and after B alone and cycle 1. Once cycle is equivalent to two weeks. Results: 21 pts, median age 59 y/o (range 26–75), M:F = 15:6, 4 with prior F in adjuvant setting, have been enrolled to date. 20 pts are evaluable for response. One pt is too early. A total of 215 cycles have been administered (median 11). Median PFS has not been reached after a median follow-up of 8 months. By intent-to-treat analysis, there were 14 PRs (70%), and 5 (25%) pts with stable disease observed (including 1 unconfirmed PR). PRs were observed from 9 to 35 weeks after the first cycle (median: 18 weeks). 9 pts remain on treatment (1–12 months); 12 pts are off study (3 for progressive disease, 1 withdrew, 4 sent for curative surgery, 2 for toxicity, 2 sent for surgery unrelated to cancer). Toxicity included 10 cases of grade 3 neutropenia, including 1 febrile neutropenia, 4 venous thrombi, and 6 cases of hypertension requiring medication change. One pt included in the analysis developed peritonitis, considered a possible microperforation, after B alone and never received FOLFIRI. No ≥ grade 3 diarrhea was observed. Analysis of correlative studies will be presented at a later date. Conclusion: Our preliminary results indicate that FOLFIRI-B is well tolerated and an excellent choice as a first-line treatment for mCRC. [Table: see text]
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