OP0281 PHARMACODYNAMIC EFFECT OF SEQUENTIAL BELIMUMAB (BEL) AND RITUXIMAB (RTX) THERAPY IN PATIENTS (PTS) WITH SYSTEMIC LUPUS ERYTHEMATOSUS (SLE): THE PHASE 3, RANDOMISED, PLACEBO-CONTROLLED BLISS-BELIEVE STUDY

Background

BEL is approved for active SLE and lupus nephritis (adults only). Despite failed trials,1 RTX remains in the SLE treatment armamentarium. Sequential BEL and RTX therapy offers a promising strategy to target B cells by distinct but complementary mechanisms.

Objectives

To assess the pharmacodynamic effects of BEL and a single RTX cycle on immunologic biomarkers in adults with SLE.

Methods

In this 104-week (wk) study (NCT03312907), all pts with active SLE received subcutaneous BEL 200 mg/wk for 52 wks. Pts were randomised to receive intravenous (IV) RTX 1000 mg at Wks 4 + 6 (BEL/RTX), IV PBO at Wks 4 + 6 (BEL/PBO), or continued treatment with standard therapy (BEL/ST). For BEL/RTX and BEL/PBO pts, a 52-wk treatment-free observational phase followed the 52-wk treatment phase; BEL/ST pts continued to receive BEL for 104 wks. Changes from baseline (BL) in anti-dsDNA and C3/C4 levels, and counts of total B cells (CD19+) and B-cell subsets (CD20+; naïve; memory; activated B-cells), were analysed.

Results

292 pts received ≥1 study treatment dose (BEL/PBO n=72; BEL/RTX n=144; BEL/ST n=76). For pts assessed at Wk 52, reductions from BL in anti-dsDNA levels were seen in all 3 groups with a significant difference between BEL/RTX and BEL/PBO (p=0.0495). C3/C4 levels increased from BL to Wks 52 and 104 in all groups, with trends for greater increases with BEL/RTX versus BEL/PBO (Table 1). At Wk 52, total B cells and most B-cell subsets decreased in all 3 groups (Table 1), with significant differences between BEL/RTX and BEL/PBO (p<0.0001 for all). During the observation period, repopulation of total CD19+ B cells (comprising mostly of naïve CD20+CD27-) towards BL levels by Wk 104 was most evident with BEL/RTX, while low circulating CD20+CD27+ memory B cell levels remained relatively unchanged (Table 1).

Table 1.

Absolute changes in biomarkers for treatment phase completers*

Median (25th, 75thpercentile)Change from BLAt Wk 52At Wk 104BEL/PBOBEL/RTXBEL/STBEL/PBOBEL/RTXBEL/STn=54n=102n=58n=24n=44n=50Anti-dsDNA (IU/ml)-9 (-83, 1)-51 (-155, -3)-5 (-61, 0)-9.5 (-197, 2)-55 (-329, -2)-6.5 (-57, -1)C3 (md/dl)8.5 (-8, 21)15† (0, 30)1‡ (-6, 11)6 (-5.5, 19.5)11 (-7, 27)7.5 (-5, 23)C4 (md/dl)2 (0, 5)4† (2, 9)2‡ (-1, 4)1.5 (-1.5, 4.5)3 (0, 8)3 (1, 5)B cells and B-cell subsets (cells/ml)n=48n=93n=55n=20n=40n=47CD19+-57,570 (-120,810, -5861)-95,313 (-193,946, -44,240)-57,399 (-152,403, -12,562)-41,343 (-105,789, 23,819)-11,932 (-77,822, 45,773)-48,783 (-151,528, -15,603)CD20+-58,112 (-110,681, -3126)-93,482 (-189,567, -42,636)-57,428 (-147,094, -3590)-40,773 (-95,658, 25,547)-3986 (-75,942, 49,021)-45,110 (-143,321, -15,063)Naïve CD20+CD27--60,929 (-112,623, -15,316)-61,405 (-152,261, -28,496)-62,477 (-142,009, -16,191)-22,210 (-72,131, 28,335)6941 (-62,669, 67,355)-51,254 (-142,712, -14,736)Activated CD95+-5012 (-12,701, 278)-9991 (-17,900, -5560)-3895 (-10,068, -1347)-3834 (-13,274, 1490)-5821 (-11,216, -233)-5641 (-14,810, -3341)Memory CD20+CD27+9,586 (1500, 30,983)-15,076 (-42,880, -6376)5532 (-146, 14,393)-13,927 (-24,816, -3064)-11,534 (-25,646, -2958)-1229 (-8466, 7300)

*Excluded from analysis: all pts who discontinued the investigational product before Wk 52 and BEL/ST pts if discontinued before Wk 104, and BEL/PBO and BEL/RTX pts who re-started BEL after Wk 53; †n=101; ‡n=57.

Conclusion

An improvement in anti-dsDNA and C3/C4 levels was generally observed across all 3 treatment groups with greater reductions in anti-dsDNA antibodies following BEL/RTX versus BEL/PBO and BEL/ST. We believe that BEL induced a pharmacodynamic window for subsequent RTX treatment for a marked reduction in circulating memory B cells and other B-cell subsets. Our findings underscore the need for better understanding of the bridge from pharmacodynamic to clinical outcomes, given that BEL/RTX did not show an improvement in disease control over BEL/PBO.1

References

[1]Aranow C, et al. Arthritis Rheumatol 2021;73 (suppl 10).

Acknowledgements

This analysis of the GSK Study 205646 was funded by GlaxoSmithKline (GSK). Medical writing support was provided by Nicholas Thomas, PhD, Fishawack Indicia Ltd. UK, part of Fishawack Health, and was funded by GSK.

Disclosure of Interests

Y.K. Onno Teng Consultant of: GSK, Aurinia Pharmaceuticals, Novartis, KezarBio, Otsuka, Vifor Pharma, Grant/research support from: GSK, Vifor Pharma, Aurinia Pharmaceuticals, Andre van Maurik Shareholder of: GSK, Employee of: GSK, Kenneth L Clark Shareholder of: GSK, Employee of: GSK, Norma Lynn Fox Shareholder of: GSK, Employee of: GSK, Yun Irene Gregan Shareholder of: GSK, Employee of: GSK, James Groark Shareholder of: GSK, Employee of: GSK, Robert Henderson Shareholder of: GSK, Employee of: GSK, Josephine Ocran-Appiah Shareholder of: GSK, Employee of: GSK, David Roth Shareholder of: GSK, Employee of: GSK, Don Shanahan Shareholder of: GSK, Employee of: GSK, Paul-Peter Tak Shareholder of: GSK, Employee of: GSK, Cynthia Aranow Consultant of: BMS, Kezar, GSK, Grant/research support from: GSK

Critical care usage after major gastrointestinal and liver surgery: a prospective, multicentre observational study

BACKGROUND

Patient selection for critical care admission must balance patient safety with optimal resource allocation. This study aimed to determine the relationship between critical care admission, and postoperative mortality after abdominal surgery.

METHODS

This prespecified secondary analysis of a multicentre, prospective, observational study included consecutive patients enrolled in the DISCOVER study from UK and Republic of Ireland undergoing major gastrointestinal and liver surgery between October and December 2014. The primary outcome was 30-day mortality. Multivariate logistic regression was used to explore associations between critical care admission (planned and unplanned) and mortality, and inter-centre variation in critical care admission after emergency laparotomy.

RESULTS

Of 4529 patients included, 37.8% (n=1713) underwent planned critical care admissions from theatre. Some 3.1% (n=86/2816) admitted to ward-level care subsequently underwent unplanned critical care admission. Overall 30-day mortality was 2.9% (n=133/4519), and the risk-adjusted association between 30-day mortality and critical care admission was higher in unplanned [odds ratio (OR): 8.65, 95% confidence interval (CI): 3.51-19.97) than planned admissions (OR: 2.32, 95% CI: 1.43-3.85). Some 26.7% of patients (n=1210/4529) underwent emergency laparotomies. After adjustment, 49.3% (95% CI: 46.8-51.9%, P<0.001) were predicted to have planned critical care admissions, with 7% (n=10/145) of centres outside the 95% CI.

CONCLUSIONS

After risk adjustment, no 30-day survival benefit was identified for either planned or unplanned postoperative admissions to critical care within this cohort. This likely represents appropriate admission of the highest-risk patients. Planned admissions in selected, intermediate-risk patients may present a strategy to mitigate the risk of unplanned admission. Substantial inter-centre variation exists in planned critical care admissions after emergency laparotomies.

Oral Cancer Awareness of Non-Consultant Hospital Doctors in Irish Hospitals

The incidence of oral cancer is rising in Ireland. The aim of this study is to assess the level of awareness of oral cancer amongst non-consultant hospital doctors (NCHDs) in Ireland, so any knowledge deficits can be identified and addressed. Data was collected by means of an anonymous online questionnaire, which was distributed via a private social media page for NCHDs in Ireland. It was completed by 221 participants, of which over 80% recorded that they do not regularly examine patients' oral mucosa. Sixty percent were 'unsure', and 21%, 'very unsure', about diagnosing oral cancer based on clinical appearance. Nor were respondents able to identify confidently the various potential risk factors for oral cancer. Eighty-four percent of NCHDs requested further education on the topic. The response rate of the study was low, and further investigation is required to determine if the findings of this study are representative of the wider NCHD community. The chief recommendation of this paper is to provide more education about oral cancer, at both medical undergraduate and postgraduate levels, and to increase awareness of the condition amongst hospital doctors.

Barriers to dental attendance in older patients

Health professionals in Ireland are increasingly concerned about the quality of oral health in older patients. The aim of this study is to identify the obstacles that face this age-group when accessing dental care, so that we are in a better position to address them. A questionnaire was completed by 105 patients attending a geriatric outpatient clinic. Over 50 percent of respondents had not attended a dentist in over 36 months, for the reasons that 'I have no problem or need for treatment' (62%) and 'I have no teeth, and therefore I have no need to go' (54%). While it is common to assume that no teeth means no need to see a dentist, research shows that regular dental visits are vital for ensuring the early screening of oral cancer and other mucosal pathologies, and the optimisation of existing rosthesis/restorations. The chief recommendation of this paper is thus to provide better education and access to older people on the importance of visiting the dentist.

Aetiology of femoral hernias revisited: bilateral femoral hernia in a young male (two cases)

Bilateral femoral hernias are less common in men than in women and rare in young adults. Only one case of a bilateral femoral hernia in a young man has been reported in the literature before. Three main theories have been postulated for femoral hernias. The theory that they are an acquired disease is the most accepted due to the common occurrence of such hernias in multiparous women but the theory lacks enough evidence. We report two cases in young men. Anatomical variations in the femoral canal could be the primary aetiological factor in these patients. A unilateral femoral hernia in young men with acquired aetiological factors requires a clinical examination of the opposite side.

Aetiology of femoral hernias revisited: bilateral femoral hernia in a young male (two cases)

Bilateral femoral hernias are less common in men than in women and rare in young adults. Only one case of a bilateral femoral hernia in a young man has been reported in the literature before. Three main theories have been postulated for femoral hernias. The theory that they are an acquired disease is the most accepted due to the common occurrence of such hernias in multiparous women but the theory lacks enough evidence. We report two cases in young men. Anatomical variations in the femoral canal could be the primary aetiological factor in these patients. A unilateral femoral hernia in young men with acquired aetiological factors requires a clinical examination of the opposite side.

Enhanced target gene knockdown by a bifunctional shRNA: a novel approach of RNA interference

RNA interference (RNAi) is a natural cellular regulatory process that inhibits gene expression by transcriptional, post-transcriptional and translational mechanisms. Synthetic approaches that emulate this process (small interfering RNA (siRNA), short hairpin RNA (shRNA)) have been shown to be similarly effective in this regard. We developed a novel 'bifunctional' RNAi strategy, which further optimizes target gene knockdown outcome. A bifunctional construct (bi-sh-STMN1) was generated against Stathmin1, a critical tubulin modulator that is overexpressed in human cancers. The bifunctional construct is postulated to concurrently repress the translation of the target mRNA (cleavage-independent, mRNA sequestration and degradation) and degrade (through RNase H-like cleavage) post-transcriptional mRNA through cleavage-dependent activities. Bi-sh-STMN1 showed enhanced potency and durability in parallel comparisons with conventional shRNA and siRNAs targeting the same sequence. Enhanced STMN1 protein knockdown by bi-sh-STMN1 was accompanied by target site cleavage at the mRNA level showed by the rapid amplification of complementary DNA ends (RACE) assay. Bi-sh-STMN1 also showed knockdown kinetics at the mRNA level consistent with its multieffector silencing mechanisms. The bifunctional shRNA is a highly effective and advantageous approach mediating RNAi at concentrations significantly lower than conventional shRNA or siRNA. These results support further evaluations.

The academic environment: the students' perspective

Dental education is regarded as a complex, demanding and often stressful pedagogical procedure. Undergraduates, while enrolled in programmes of 4-6 years duration, are required to attain a unique and diverse collection of competences. Despite the major differences in educational systems, philosophies, methods and resources available worldwide, dental students' views regarding their education appear to be relatively convergent. This paper summarizes dental students' standpoint of their studies, showcases their experiences in different educational settings and discusses the characteristics of a positive academic environment. It is a consensus opinion that the 'students' perspective' should be taken into consideration in all discussions and decisions regarding dental education. Moreover, it is suggested that the set of recommendations proposed can improve students' quality of life and well-being, enhance their total educational experience and positively influence their future careers as oral health physicians. The 'ideal' academic environment may be defined as one that best prepares students for their future professional life and contributes towards their personal development, psychosomatic and social well-being. A number of diverse factors significantly influence the way students perceive and experience their education. These range from 'class size', 'leisure time' and 'assessment procedures' to 'relations with peers and faculty', 'ethical climate' and 'extra-curricular opportunities'. Research has revealed that stress symptoms, including psychological and psychosomatic manifestations, are prevalent among dental students. Apparently some stressors are inherent in dental studies. Nevertheless, suggested strategies and preventive interventions can reduce or eliminate many sources of stress and appropriate support services should be readily available. A key point for the Working Group has been the discrimination between 'teaching' and 'learning'. It is suggested that the educational content should be made available to students through a variety of methods, because individual learning styles and preferences vary considerably. Regardless of the educational philosophy adopted, students should be placed at the centre of the process. Moreover, it is critical that they are encouraged to take responsibility for their own learning. Other improvements suggested include increased formative assessment and self-assessment opportunities, reflective portfolios, collaborative learning, familiarization with and increased implementation of information and communication technology applications, early clinical exposure, greater emphasis on qualitative criteria in clinical education, community placements, and other extracurricular experiences such as international exchanges and awareness of minority and global health issues. The establishment of a global network in dental education is firmly supported but to be effective it will need active student representation and involvement.

Central venous catheterization -- an anatomical review of a clinical skill -- Part 1: subclavian vein via the infraclavicular approach

The safe and successful performance of a central venous catheterization (CVC) requires a specific knowledge of anatomy in addition to a working knowledge. Misunderstanding the anatomy may result in failure or complications. This review aims to aid understanding of the anatomical framework, pitfalls, and complications of CVC of the subclavian (SCV). CVC is common practice amongst surgeons, anesthesiologists, and emergency room physicians during the preparations for major surgical procedures such as open-heart surgery, as well as, for intensive care monitoring and rapid restoration of blood volume. Associated with this technique are certain anatomical pitfalls and complications that can be successfully avoided if one possesses a thorough knowledge of the contraindications, regional anatomy, and rationale of the technique.

Anatomical study comparing the thickness of the volar and dorsal cortex of cadaveric adult distal radii using digital photography

INTRODUCTION

Dorsally displaced fractures of the distal radius fractures are one of the commonest in day-to-day practice. There is still no consensus among surgeons regarding the suitability of using volar or the dorsal cortex as basis for internal fixation for dorsally displaced fractures.

BACKGROUND

We report an anatomical study, which compares the thickness of the volar and dorsal cortices of cadaveric adult radii using digital photography.

RESULTS

Results of this study show that the volar cortex was statistically, significantly thicker than the dorsal cortex. We believe that the volar cortex may behave as the calcar of the distal radius and hence internal fixation devices applied to the volar cortex may provide a more stable internal fixation compared to those based on the dorsal cortex.

Proof concept for clinical justification of network mapping for personalized cancer therapeutics

To identify signature targets associated with patient-specific cancer lesions based on tumor versus normal tissue differential protein and mRNA coexpression patterns for the purpose of synthesizing cancer-specific customized RNA interference knockdown therapeutics. Analysis of biopsied tissue involved two-dimensional difference in-gel electrophoresis (2D-DIGE) analysis coupled with MALDI-TOF/TOF mass spectrometry for proteomic assessment. Standard microarray techniques were utilized for mRNA analysis. Priority was assigned to overexpressed protein targets with co-overexpressed genes with a high likelihood of functional nodal centrality in the cancer network as defined by the interactive databases BIND, HPRD and ResNet. HPLC-grade small interfering RNA (siRNA) duplexes were utilized to assess knockdown of target proteins in expressive cell lines as measured by western blot. Seven patients with metastatic cancer underwent biopsy. One patient (RW001) had biopsies from two disease sites 10 months apart. Seven priority proteins were identified, one for each patient (RACK 1, Ras related nuclear protein, heat-shock 27 kDa protein 1, superoxide dismutase, enolase1, stathmin1 and cofilin1). Prioritized proteins in RW001 from the two disease sites over time were the same. We demonstrated >80% siRNA inhibition of RACK 1 and stathmin1 of inexpressive malignant cell lines with correlated cell kill. Identification of functionally relevant target gene fingerprints, unique to an individual's cancer, is feasible 'at the bedside' and can be utilized to synthesize siRNA knockdown therapeutics. Further animal safety testing followed by clinical study is recommended.

Near-fatal spontaneous hepatic rupture associated with anabolic androgenic steroid use: a case report

Anabolic androgenic steroids are commonly used at high doses by bodybuilders and athletes to enhance physique and improve performance levels. We report a case of spontaneous hepatic rupture with life-threatening haemorrhage associated with a past history of anabolic steroid use.

Distal radioulnar joint incongruity after shortening of the ulna

Coronal sections of the distal radioulnar joint (DRUJ) were studied in 13 preserved cadaveric wrists specimens before and after 2 mm of shortening of the ulna. The DRUJs were subclassified on the basis of the DRUJ angle and depth of the sigmoid notch. The changes in extent and location of area of contact and radioulnar separation were noted. Although reduction in area of contact occurred in every specimen and DRUJ type, the maximum radioulnar separation and reduction in area of contact occurred in the DRUJ type IB and IIB. This could be a possible factor producing point loading and subsequent occurrence of DRUJ remodelling in the long-term after shortening of the ulna.

Rare origin of the inferior epigastric artery from an anomalous medial circumflex femoral artery

Mathes & Bostwick (1977) surgically manipulated the rectus abdominis myocutaneous flap to repair defects in the anterior abdominal wall. Subsequently this flap was used in breast reconstruction (Robbins, 1981; Hartrampf et al. 1982) as a donor for free-tissue transfer (Bunkis et al. 1983) and to repair defects in the groin (Logan & Mathes, 1984; Ramasastry et al. 1989). Disadvantages of this flap are that it can be too thick to use effectively and a direct abdominal hernia may occur through the inguinal triangle (Mathes & Bostwick, 1977; Pennington & Pelly, 1980; Ramasastry et al. 1989; Itoh & Arai, 1993). To overcome these disadvantages the rectus abdominis and the fascia covering the inguinal triangle must be intact. Surgeons therefore harvested the inferior epigastric skin flap for free-tissue skin transfer; this flap contained little or no rectus abdominis muscle or transversalis fascia (Koshima & Soeda, 1989). Previous investigators determined the anatomical basis for the use of this skin flap and used it to repair defects following resection of ulcers and scar tissue on the head, neck and extremities (Itoh & Arai, 1993).

The intramuscular arterial anatomy of the long head of biceps femoris muscle

We have previously shown that the neurovascular anatomy and length of the long head of biceps femoris (LHBF) is suitable for its possible use in the creation of a dynamic perianal myoplasty to restore faecal continence. If intramuscular arterioarterial anastomoses exist between a muscle's vascular pedicles then the delay procedure, i.e. ligating the vascular pedicles to the transposed section of the muscle, 4-6 wk before transposition, can be used to improve blood flow to the distal part of the transposed muscle. The intramuscular arterial anatomy of 20 biceps femoris muscles was shown by dissection (14) or radiographically (6). The mean entry point of the upper major vascular pedicle to the LHBF was 12 cm (S.D. 3.3) and the mean length of the LHBF was 36.8 cm (S.D. 1.8). Therefore the ratio between upper major vascular pedicle entry point and muscle length in 95% of specimens was 0.33 (0.2). In the present study intramuscular arterioarterial anastomoses were found between the arterial pedicles to the nontransposed and transposed sections of the LHBF and between the long and short heads of this muscle. Using the delay procedure would therefore theoretically allow the intramuscular arterioarterial anastomoses between the arterial pedicle to the nontransposed and transposed sections of the LHBF to open up enhancing blood flow to the distal part of the myoplasty.

A longitudinal evaluation of prevalent negative beliefs about residential placement for troubled adolescents

To investigate the validity of five prevalent negative beliefs about residential placement, we followed adolescents from a residential program and a comparison group at 3-month intervals for 4 to 8 years. This residential program in the Midwest uses the Teaching-Family Model in which six to eight adolescents live in a family-style environment. The interviews included five scales reflecting youths' views about important aspects of their lives in placement: (1) Delivery of Helpful Treatment, (2) Satisfaction with Supervising Adults, (3) Isolation from Family, (4) Isolation from Friends, and (5) Sense of Personal Control. Hierarchical linear modeling allowed us to estimate group differences while controlling for developmental trends, demographic factors, and prior differences between groups. The two groups were equivalent on all scales before the study. During the following placement, however, the treatment group's ratings were significantly more positive than the comparison group on four of the five scales and approached significance on the fifth. These findings suggest that negative beliefs about life in residential placement for adolescents may not apply to all programs.

Anatomical variation of the insertion of scalenus anterior in adult human subjects: implications for clinical practice

The frequency of an abnormally anterior insertion of scalenus anterior to the scalene tubercle on the superior aspect of the 1st rib was examined as a possible contributory factor to venous compression syndromes and to difficulties in cannulation of the subclavian vein. The insertion of scalenus anterior was exposed bilaterally in 21 adult cadavers and its position determined. The position of the scalene tubercle was also determined in a sample of 50 dried 1st ribs. The results were normalised for height. Three of the cadavers had position values that were above or at the upper point of the 95% confidence limits for the sample, indicating an abnormally anterior insertion. Two dried 1st ribs had values just below the lower 95% confidence limits, implying an abnormally posterior position. In the 3 cadavers with an abnormally anterior position, the subclavian artery and vein followed an abnormally anterior and inferior course with respect to the clavicle, and in 1 the subclavian vein was stenosed bilaterally at the costoclavicular angle. An abnormally anterior insertion of scalenus anterior may be a cause of venous compression syndromes in the root of the neck and give rise to difficulties when undertaking cannulation of the subclavian vein.

Retrograde femoral angioplasty: a new technique

Percutaneous transluminal angioplasty cannot be used for lesions of the superficial femoral artery when the origin of the vessel is occluded. A new technique, retrograde femoral angioplasty, is described in which angioplasty is performed from below via the exposed popliteal artery. In four out of six patients retrograde femoral angioplasty was successfully completed, and three of the four vessels remain patent up to 1 year later. The method provides an alternative to the femoropopliteal bypass graft in some patients.

Wound perfusion with bupivacaine: objective evidence for efficacy in postoperative pain relief

Conflicting reports exist for the efficacy of intermittent wound perfusion with bupivacaine in the relief of postoperative pain. A study was devised to assess postoperative pain relief objectively using a Patient Controlled Analgesic Device (PCAD) during continuous wound perfusion with bupivacaine or saline. Thirty consecutive patients undergoing cholecystectomy were randomised to receive continuous postoperative wound perfusion with 0.5% bupivacaine for 24 h followed by normal saline for a further 24 h or vice versa. During the study period, conventional analgesia was provided using a PCAD set to deliver (and record the number of) on-demand bolus doses of intravenous pethidine 0.2 mg/kg at half-hourly intervals as required. Pethidine requirements were higher on the first postoperative day, regardless of which solution was given, but bupivacaine perfusion almost halved mean linear analogue pain scores compared to those recorded with saline. Likewise, the number of bolus doses of pethidine demanded was reduced by an average of 68% compared to those recorded during saline perfusion on day 1 (P = 0.01) and by 82% on day 2 (P = 0.01). When assessed by objective criteria, perfusion of surgical wounds with bupivacaine after cholecystectomy produces better pain relief than wound perfusion with saline.

Clinical acute cholecystitis and the Curtis-Fitz-Hugh syndrome

When patients are admitted with clinically diagnosed acute cholecystitis, no cause will be found for their pain in 9-13% (4.5). Our retrospective study shows that women between 15-35 years are most likely to be in this group. Our prospective study of all patients in the 15-35 year age group admitted with clinical 'acute cholecystitis', showed that in 6 out of 7 patients with 'undiagnosed' pain, the Curtis-Fitz-Hugh syndrome was the cause. We suggest that screening for the Curtis-Fitz-Hugh syndrome is performed in all patients with right upper quadrant pain who have a normal ultrasound scan.