Texture Analysis of Fractional Water Content Images Acquired during PET/MRI: Initial Evidence for an Association with Total Lesion Glycolysis, Survival and Gene Mutation Profile in Primary Colorectal Cancer.

To assess the capability of fractional water content (FWC) texture analysis (TA) to generate biologically relevant information from routine PET/MRI acquisitions for colorectal cancer (CRC) patients. Thirty consecutive primary CRC patients (mean age 63.9, range 42-83 years) prospectively underwent FDG-PET/MRI. FWC tumor parametric images generated from Dixon MR sequences underwent TA using commercially available research software (TexRAD). Data analysis comprised (1) identification of functional imaging correlates for texture features (TF) with low inter-observer variability (intraclass correlation coefficient: ICC > 0.75), (2) evaluation of prognostic performance for FWC-TF, and (3) correlation of prognostic imaging signatures with gene mutation (GM) profile. Of 32 FWC-TF with ICC > 0.75, 18 correlated with total lesion glycolysis (TLG, highest: rs = -0.547, p = 0.002). Using optimized cut-off values, five MR FWC-TF identified a good prognostic group with zero mortality (lowest: p = 0.017). For the most statistically significant prognostic marker, favorable prognosis was significantly associated with a higher number of GM per patient (medians: 7 vs. 1.5, p = 0.009). FWC-TA derived from routine PET/MRI Dixon acquisitions shows good inter-operator agreement, generates biological relevant information related to TLG, GM count, and provides prognostic information that can unlock new clinical applications for CRC patients.

FDG-PET/CT in colorectal cancer: potential for vascular-metabolic imaging to provide markers of prognosis.

PURPOSE: This study assesses the potential for vascular-metabolic imaging with FluoroDeoxyGlucose (FDG)-Positron Emission Tomography/Computed Tomography (PET/CT) perfusion to provide markers of prognosis specific to the site and stage of colorectal cancer. METHODS: This prospective observational study comprised of participants with suspected colorectal cancer categorized as either (a) non-metastatic colon cancer (M0colon), (b) non-metastatic rectal cancer (M0rectum), or (c) metastatic colorectal cancer (M+). Combined FDG-PET/CT perfusion imaging was successfully performed in 286 participants (184 males, 102 females, age: 69.60 ± 10 years) deriving vascular and metabolic imaging parameters. Vascular and metabolic imaging parameters alone and in combination were investigated with respect to overall survival. RESULTS: A vascular-metabolic signature that was significantly associated with poorer survival was identified for each patient group: M0colon - high Total Lesion Glycolysis (TLG) with increased Permeability Surface Area Product/Blood Flow (PS/BF), Hazard Ratio (HR) 3.472 (95% CI: 1.441-8.333), p = 0.006; M0rectum - high Metabolic Tumour Volume (MTV) with increased PS/BF, HR 4.567 (95% CI: 1.901-10.970), p = 0.001; M+ participants, high MTV with longer Time To Peak (TTP) enhancement, HR 2.421 (95% CI: 1.162-5.045), p = 0.018. In participants with stage 2 colon cancer as well as those with stage 3 rectal cancer, the vascular-metabolic signature could stratify the prognosis of these participants. CONCLUSION: Vascular and metabolic imaging using FDG-PET/CT can be used to synergise prognostic markers. The hazard ratios suggest that the technique may have clinical utility.

Adult necrotising enterocolitis-pig-bel disease: a Pacific disease in London.

Adult necrotising enterocolitis secondary Clostridium perfringens type C-pig-bel disease-is rarely seen outside of Pacific populations, with the highest incidence being in Papau New Guinea. We present the first reported case of pig-bel disease in a previously well patient without diabetes following food poisoning since 1996. In this case, the enterotoxin-induced disease necessitated emergency laparotomy and bowel resection following the failure of medical treatment and worsening septic shock. We hypothesise that obstruction secondary to a sigmoid diverticular stricture complicated by infection-related oedema led to colonic stasis and rapid progression of disease and bowel loss. Following bowel resection, several parenteral antibiotic agents and prolonged intensive care, this patient survived this severe infective process and was discharged home.

The economic benefit of photodynamic diagnosis in non-muscle invasive bladder cancer.

Non-muscle invasive bladder cancer is the most expensive cancer to manage on a per patient basis due to the high recurrence rate, low mortality and the need for long term, often lifelong surveillance. Current white-light endoscopic surgery leads to a significant number of patients having "recurrent" cancer at their first follow-up cystoscopy. The introduction of a single dose of intravesical chemotherapy immediately after the initial resection has helped to reduce the recurrence rate but it can be toxic and should not be administered to patients with potential bladder perforations after transurethral resection of bladder tumour (TURBT). Photodynamic diagnosis cystoscopy has been shown to significantly improve the quality of the initial TURBT leading to a 20% reduction in tumour recurrences at 3 months. This benefit is sustained for at least 8 years, leading to a reduction in further invasive procedures and treatment. Despite the initial increased cost related to introducing a photodynamic diagnosis service there is clearly long-term significant cost savings to be made, as well as improving the patient experience and quality of life.