Two-centre, open label, uncontrolled, dose-finding phase I study, to determine the safety and tolerability of APO010 administered by intravenous bolus injection once per week in patients with solid tumors, for whom therapy of proven efficacy does not exist or is no longer effective. The dose-escalations will follow a classical Fibonacci schedule, meaning at least three patient per dose-level, prior to further escalation. The dose-level assignment and patient registration is centralized by SENDO-Switzerland & Milan offices.