 The Dose-Escalation Cohort will consist of the Pretreatment Phase, the Treatment Phase, the Extension Phase, Discontinuation and Follow-up. The Pretreatment Phase will include a Consent and Screening Period. The Treatment Phase will consist of the Lead in Period and first 21-day cycle of treatment during which subjects will be monitored for the development of dose-limiting toxicity DLT following 1 week of washout. The Extension Phase will start from the start of Cycle 2 with intra-subject dose-escalation performed until discontinuation of study treatment. Upon discontinuation of study treatment, discontinuation visit assessments should occur within 7 days of treatment discontinuation or confirmation of discontinuation criteria. End of treatment information will also be collected for all subjects who discontinue treatment after completion of cycle 1 treatment. Follow-up visitfinal visit evaluations will be performed 28 5 days days after the last rSIFN-co administration. The decision to undergo dose-escalation to the next dose level will be based on the safety information obtained during Cycle 1. 