311 Can We Predict Extraprostatic Extension (EPE) Prior To Radical Prostatectomy? – A Single Institution Comparison of Pre-Operative Biopsy Histology and Multiparametric MRI (mpMRI) With Radical Prostatectomy Specimen Histology

Introduction

Prostate biopsies and mpMRI play an integral role in diagnosis of prostate cancer. The aim of our study was to assess the ability to predict EPE based on pre-operative histology and mpMRI.

Method

We retrospectively analysed 235 patients who underwent radical prostatectomy between January 2015 and April 2017. All patients underwent pre-biopsy mpMRI scans and prostate biopsies. All mpMRIs were reported by dedicated uro-radiologists and all histology was reported by dedicated uro-pathologists.

Results

17/25 patients showing EPE on mpMRI had it confirmed on final histology.

a53/210 patients showing organ-confirmed disease on mpMRI had EPE on final histology.

40/49 patients who had Gleason 6 adenocarcinoma were organ-confined.

61/186 patients with > Gleason 7 adenocarcinoma had EPE.

Sensitivity of mpMRI was 25% with a specificity of 95%. The positive predictive value (PPV) was 68% and negative predictive value (NPV) was 75%.

The specificity of pre-biopsy Gleason score > 7 to predict EPE was 81% and sensitivity was 33% with a PPV of 87%.

Conclusions

Our data suggests that by using > Gleason 7 and mpMRI as a combination, we can reliably predict EPE on final histology which in turn will help counsel patients appropriately for treatment options. Further data collection is ongoing at our institution.

Extractive spectrophotometric determination of ceterizine HCl in pharmaceutical preparations

Two simple, rapid and sensitive extractive spectrophotometric methods have been developed for the assay of ceterizine hydrochloride (CTZH) in bulk drug and in pharmaceutical preparations. These methods are based on the formation of chloroform soluble complexes between CTZH with bromocresol purple (BCP) or bromophenol blue (BPB) in Walpole buffer of pH 2.64 with an absorption maximum at 409 nm and at 414 nm for BCP and BPB, respectively. Reaction conditions were optimised to obtain the maximum colour intensity. The absorbance was found to increase linearly with increase in concentration of CTZH, which was corroborated by the calculated correlation coefficient value (0.9991-0.9995). The system obeyed Beer's law in the range of 1-16 and 1.5-21 microl x ml(-1) for BCP and BPB, respectively. The various analytical parameters have been evaluated. The results obtained by the proposed methods were statistically compared by means of students t-test and by the variance ratio, F-test with those of the reported method and have shown to be in excellent agreement with the reported method.

Spectrophotometric determination of certain vicinal dihydroxybenzene derivatives in pharmaceutical preparations

A simple, rapid and sensitive spectrophotometric method for the assay of certain adrenergic drugs, [pyrocatechol (PC), levodopa (LD), methyldopa (MD) and dopamine (DP)] is described. The method involves the oxidation of o-dihydroxybenzene derivatives by K2CrO4 followed by oxidative coupling with sulfanilic acid (SPA), leading to the formation of a red or violet colored product having maximum absorbance at 490-495 nm for LD, MD and DP or at 560 nm for PC. This method has been successfully applied to the determination of LD, MD and DP in tablets and injections of pharmaceutical preparation. The common excipients do not interfere with the proposed method. A statistical comparison of these results with those of a reported method shows good agreement and indicates no significant difference in precision.