The purpose of this study is to test the effectiveness and safety of a new peptide-based coagulant, PeproStat. The study drug will be applied to patients undergoing liver/soft tissue surgery, vascular surgery or spine surgery. The speed of action of the new coagulant, that is applied with a gelatin sponge, will be compared to the same sponge but with saline (a commonly used standard of care).

PeproStat is a new class of topical haemostatic agent composed of recombinant human albumin (rHA) conjugated with fibrinogen-binding peptides. The conjugate polymerises fibrinogen into a fibrin-like clot without the need for thrombin.

PeproStat is formulated in a liquid, and is soaked into a haemostatic gelatin sponge in the operating theatre, and applied directly to the site of bleeding. The gelatin sponge (Spongostan ) is an approved "passive" haemostat i.e., PeproStat is an adjunct to a passive haemostat.

The study is designed in a 2:1 randomization (verum:placebo) to investigate the efficacy in terms of Time to hemostasis, mean (mTTH) at the primary target bleed site (TBS), measured in minutes (min) from the start of treatment application (TxStart) at the TBS to the achievement of hemostasis at that site or to the end of the 10-minute assessment period if hemostasis has not yet been achieved.

Inclusion Criteria: At screening and baseline:

1. Subject is undergoing a planned open liver/soft tissue surgery, vascular surgery or spine surgery.

2. Subjects are able and willing to provide written informed consent to participate in this study.

3. Adult males and females ≥18 years of age at screening.

4. Willing and able to comply with all protocol requirements including follow-up assessments.

5. Male subjects must be willing and able to use adequate contraception from enrollment through to the 30 day follow-up visit.

6. Women of childbearing potential (WCBP)C have to use highly effective methods of contraception from enrollment through to the 30 day follow-up visit.

   Intraoperative:

7. The subject presents an identified target bleeding site with mild or moderate bleeding, which conventional surgical techniques are insufficient to control or are inappropriate and would otherwise be a candidate for standard haemostats.

8. The subject presents no intraoperative complications, other than bleeding, that may interfere with study assessments as judged by the Investigator.

9. The subject presents no contaminated areas of the body, signs of infection or abscess development.

10. Total target bleeding site surface area of ≤ 70 cm2, defined within one or two TBSs.

Exclusion Criteria:

1. Subject is undergoing emergency surgical procedure.

2. Use of study treatment and sponge in

   • Closure of skin incisions as the sponge may interfere with the healing of skin edges.
   • Intravascular compartments because of the risk of embolization following sponge application.

3. Recipient of an organ transplant.

4. Haematologic, biochemistry and coagulation panel thresholds at screening:

   • Haemoglobin ≤ 9.0 g/dL.
   • Platelet count ≤100,000/mm3 (≤ 100 x 109/L).
   • International Normalized Ratio (INR) > 2.0 or activated Partial Thromboplastin Time (aPTT) ratio > 2.0.
   • Fibrinogen level < 1.5 g/L.
   • Aspartate Aminotransferase (AST) or Alanine aminotransferase (ALT) ≥ 3 times the upper limit normal range, except for subjects undergoing liver resection surgery where there is no upper limit for these analytes due to the nature of their disease.

5. Severe renal failure.

6. Any other disease or condition that may affect normal blood clotting, for example thrombocytopenia, as judged by the Investigator.

7. A known history of anaphylaxis or allergic reaction to human albumin, PEGylated proteins, yeast or moulds, porcine products or other components in the study medication or sponge.

8. Participation in another investigational drug or device research study within 30 days before and after enrolment in the current study.

9. Current known or suspected alcohol and/or drug abuse or dependence at the time of screening.

10. Any concurrent medical, surgical, or psychiatric condition that may, in the Investigator's opinion, affect the subject's willingness or ability to meet all study requirements during the study duration.

11. Known HIV, Hepatitis B virus or Hepatitis C Virus infection.

12. During the surgery, subject presents severe bleeding where use of a topical haemostat would be inappropriate.

13. Anti-platelets/oral anticoagulants treatment:

    1. Soft tissue/liver and neurosurgery: Subject is taking anti-platelet agents or oral anticoagulants within 7 days of surgery
    2. Vascular surgery: Subject is taking dual anti-platelet treatment or oral anticoagulants within 7 days of surgery. One anti-platelet agent is allowed perioperatively.

14. Heparin treatment:

    c. Soft tissue/liver and neurosurgery only: Subject is receiving therapeutic doses of heparin perioperatively. Only prophylactic Low Molecular Weight Heparin is allowed.

15. Pregnant or breast-feeding subject.