OUTLINE: This is a dose-escalating study to determine the maximum tolerated dose (MTD) of ICI D1694 (TDX) given in combination with irinotecan. Irinotecan is given intravenously on day 1 and ICI D1694 intravenously on day 2. Treatment is repeated every 3 weeks until disease progression or unacceptable toxicity intervenes. Cohorts of 3-6 patients receive escalated doses of TDX until the MTD is defined; an additional 10-12 patients will be entered at the MTD to confirm this as a recommended phase II dose.