To assess the feasibility and antitumor activity of oblimersen sodium, an antisense oligonucleotide directed to the Bcl-2 mRNA, combined with irinotecan in patients with advanced colorectal carcinoma, characterize the pharmacokinetic behavior of both oblimersen sodium and irinotecan, and examine Bcl-2 protein inhibition in peripheral blood mononuclear cells (PBMC)...Conclusions: The combination is well tolerated at the recommended phase II oblimersen sodium dose of 7 mg/kg/day CIVI days 1–8 with irinotecan 280 mg/m2 intravenously on day 6 every 3 weeks