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Participants with inoperable pseudomyxoma peritonei or peritoneal mucinous tumour that meet the entry criteria and consent to the intervention will receive intratumoural treatment/s with the combination drug BromAc. The drug product will be injected directly into the tumour via a radiologically placed drain

Intratumoural injections of Bromelain 600ug/ml (maximum dose 90mg daily diluted in 150ml 0.9% NaCl) via a radiologically placed drain in combination with Acetylcysteine in 0.9% sodium chloride (normal saline).

Bromelain

Intratumoural injections of Acetylcysteine 20mg/ml (maximum dose 3g daily diluted in 150ml 0.9% NaCl) via a radiologically placed drain in combination with Bromelain.

Under radiological guidance (CT), a needle, wire, dilator will be placed directly into the tumour, then a pigtail drain (10Frg) will be secured into the tumour by an experienced, interventional radiologist, under standard procedures. This drain is utilised as access to the tumour for injections of the investigational drug product BromAc, and subsequent aspirations.

Interventional radiology insertion of drain

David L Morris, MD, PhD

Sarah J Valle, BN

Armando Sardi, MD

Haroon Choudry, MD

Edward Levine, MD

Alvaro Arjona Sanchez, MD

Ignace de Hingh, MD

Pseudomyxoma peritonei (PMP) is an orphan disease, characterized by the progressive accumulation of jelly-like material within the abdomen, which occurs in approximately 2-3 people per million per year. Advanced disease is often the result of tumour perforation and seeding of tumour cells within the peritoneal cavity. Complete cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CCRS HIPEC) is the current standard of care for PMP.

An Australian pharmaceutical company is developing BromAc for diseases involving mucin. This drug is composed of Bromelain and Acetylcysteine. During pre-clinical development, the sponsor found that BromAc rapidly dissolved and removed tumour mucin, making it a potent mucolytic. BromAc in combination have the ability, as shown in pre-clinical studies, to remove the mucin protective framework expressed by cancer including mucin (MUC) 1, MUC2, MUC4, MUC5AC and MUC16. The sponsor has shown the mechanism of action of BromAc - to break peptide and glycosidic linkages and disulphide bonds in tumour produced and respiratory mucin. BromAc has been safe in preclinical development with a manageable adverse event profile and preliminary efficacy in a phase 1 study.

This current study will examine the efficacy and safety of applying BromAc directly into recurrent mucinous tumour deposits in patients that are found to be unsuitable for repeat curative intent intervention by CCRS HIPEC.

Pseudomyxoma peritonei (PMP) is an orphan disease, characterised by the progressive accumulation of jelly-like material within the abdomen, which occurs in approximately 3 people per million per year. Advanced disease is often the result of tumour perforation and seeding of tumour cells within the peritoneal cavity, leading to this syndrome. Multifocal mucin collections are the main cause of morbidity and mortality.

In the past, management of mucinous peritoneal disease involved repeated surgical debulking, with systemic chemotherapy having minimal effect. The combined modality of complete cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CCRS HIPEC) is considered standard of care for peritoneal spread of appendiceal tumours and a treatment option for other mucinous peritoneal tumours. The intention of CCRS HIPEC is cure, however this is dependent on the characteristics and extent of tumour involvement, with the main limitation being amount of disease involving the serosa or mesentery of small bowel.

Mucin produced by tumours is known to be highly resistant to chemotherapy as mucin acts as a tumour coating. Many patients with mucinous tumours or PMP, however, can achieve long-term survival through this therapy although in a significant proportion recurrence following CCRS HIPEC occurs, and repeat interventions for recurrent disease are increasingly complex and may have a negative impact on quality of life, where the risks of the procedure in many cases outweigh the benefits.

BromAc has been safe in preclinical development and in a phase 1 study, patients received up to 60mg/2000mg of BromAc daily for a median of 3.4 days. Serious treatment-related adverse events (12%) were manageable. There were no anaphylactic reactions. An objective response to treatment was seen in 81% of patients. There were no drug-related deaths due to treatment-related adverse events. With a median follow up of 18.2 months, progression was seen in 55% at a median of 5.8 months.

This potential treatment for pseudomyxoma peritonei/appendix mucinous tumours received orphan designation from the (Food and Drug Administration (FDA) (DRU-2018-6644) European Medicines Agency (EMA) (EMA/3/18/2107, EMA/3/18/2113).

The aim of this study is to assess whether the application of BromAc via radiologically placed percutaneous catheters directly into the recurrence dissolves the mucinous tumour, allowing for the dissolved tumour to be drained. The efficacy of this intervention will be assessed via radiological imaging and clinically with the expectation that this combination treatment will result in dissolution and removal of the tumour. The surrogate endpoints used in this study will be radiological response and volume of mucin aspirated. The projected benefits of direct injection of the BromAc include improvement of symptoms of the disease, which frequently include pain, vomiting, inability to maintain adequate oral intake and progressive loss of condition.

BromAc for Recurrent Peritoneal Mucinous Tumour or Pseudomyxoma Peritonei

A Phase 2, Multi-centre Study of BromAc for Recurrent Peritoneal Mucinous Tumour or Pseudomyxoma Peritonei

Tumour changes following BromAc combination treatment compared to baseline. Efficacy will be measured by RECIST v1.1 with the volume of fluid aspirated from the drain (dissolved tumour). The treatment will be seen effective if \>30% of tumour volume is aspirated or there is a \>30% reduction on CT scan post treatment at 1 month compared to the pre-treatment scan. Given the difficulty of assessing soft tumour (cystic/mucinous) response by RECIST, a surrogate assessment of efficacy will be measured (if unable to assess based on RECIST v1.1 criteria) by tumour changes following BromAc combination treatment.

Time to progression of the treated area (duration of response) based on repeat CT scanning where RECIST v1.1 will be used where possible. The follow up scan will be compared to the 1 month post treatment scan where dimensions and volume will be calculated by an experienced radiologist.

The EORTC-QLQ-C30 (European Organisation for Research and Treatment of Cancer - Quality of Life Questionnaire Core - C30) is composed of both multi-item scales and single-item measures. These include five functional scales, three symptom scales, a global health status / Quality of Life (QoL) scale, and six single items.

The global health status / Quality of Life scale has scores from 1 (very poor) to 7 (excellent) and the others from 1 (not at all) to 4 (very much) where 4 is the worst score. All of the scales and single-item measures range in score from 0 to 100. A high scale score represents a higher response level. Thus a high score for a functional scale represents a high / healthy level of functioning, a high score for the global health status / QoL represents a high QoL, but a high score for a symptom scale / item represents a high level of symptomatology / problems.

The symptom scores (Fatigue, Nausea and vomiting, Pain ...), with scores from 1 (not at all) to 4 (very much), where 4 is the worst score, will be evaluated by the use of the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire for Colorectal Cancer (EORTC-QLQ-CR29). The trend of each category of outcome measures given by the EORTC-QLQ-CR29 in four groups of patients: tumour on the right and transverse part of the colon; tumour on the left part of the colon; rectal tumour; metastatic colorectal cancer.

Reported as any untoward medical occurrence or worsening of a pre-existing medical condition in a participant administered BromAc, and judged possibly, probably, or definitely related to treatment

Symptoms from tumour will be assessed at baseline then compared to post treatment symptoms to determine resolution or worsening of symptoms from tumour experienced.

Laboratory parameters (haematology, clinical chemistry and coagulation) will be assessed at baseline then at each interval to assess for any alteration compared to baseline assessment

Spots Global Cancer Trial Database for interventional radiology insertion of drain