Synergistic Dangers: Helicobacter Pylori and Cancer Genes

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Y Usui et al. NEJM 2023; 388: 1181-1190. Helicobacter pylori, Homologous-Recombination Genes, and Gastric Cancer

Background: Gastric cancer is the fifth most common neoplasm and the fourth leading cause of death from cancer worldwide.1 Helicobacter pylori has been classified as a group I carcinogen and is an environmental risk factor for gastric cancer.2 Although H. pylori infection affects more than half the world population

Methods: This study evaluated the association between germline pathogenic variants in 27 cancer-predisposing genes and the risk of gastric cancer in a sample of 10,426 patients with gastric cancer and 38,153 controls from BioBank Japan. This retrospective study also assessed the combined effect of pathogenic variants and H. pylori infection status on the risk of gastric cancer and calculated the cumulative risk in 1433 patients with gastric cancer and 5997 controls from the Hospital-based Epidemiologic Research Program at Aichi Cancer Center (HERPACC).

Key findings:

  • Germline pathogenic variants in nine genes: (APC, ATM, BRCA1, BRCA2, CDH1, MLH1, MSH2, MSH6, and PALB2) were associated with the risk of gastric cancer.
  • At 85 years of age, persons with H. pylori infection and a pathogenic variant had a higher cumulative risk of gastric cancer than noncarriers infected with H. pylori (45.5% vs. 14.4%).
  • Limitation: The study population was from East Asia and thus, the findings may be different in other populations.

My take: H. pylori infection has a synergistic effect in increasing the risk of gastric cancer in individuals with germline pathogenic variants in homologous-recombination genes. To minimize the risk of gastric cancer, H pylori eradication is important; however, it is especially in those with cancer-predisposing variants.

From NEJM Twitter Feed

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FDA Treatment for Rett Syndrome

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FDA 3/13/23: FDA approves first treatment for Rett Syndrome

Action

FDA has approved Daybue (trofinetide) oral solution as the first treatment for Rett syndrome, a rare, genetic neurological disorder. Daybue is approved for the treatment of Rett syndrome in adults and children 2 years of age and older.

Patients take Daybue either orally or via gastrostomy tube. The recommended dose is based on patient weight. Daybue is taken twice daily, morning and evening, with or without food.

Disease or Condition

Rett syndrome is a rare, genetic neurological and developmental disorder that affects the way the brain develops. Patients with Rett syndrome experience a progressive loss of motor skills and language. Most babies with Rett syndrome seem to develop as expected for the first six months of life. These babies then lose skills they previously had attained at approximately six to 18 months of age — such as the ability to crawl, walk, communicate, or use their hands. The hallmark of Rett syndrome is near constant repetitive hand movements, such as rubbing or clapping. Rett syndrome leads to severe impairments affecting nearly every aspect of life, including the ability to speak, walk, eat, and breathe.

The syndrome primarily affects females (1 in 10,000) and even more rarely affects males.

Effectiveness

The efficacy and safety of Daybue was evaluated in a randomized, double-blind, placebo-controlled, 12-week study (Study 1; NCT04181723) of patients with Rett syndrome five to 20 years of age. Patients were randomized to receive Daybue (N=93) or matching placebo (N=94) for 12 weeks. The dose of Daybue was based on patient weight to achieve similar exposure in all patients.

The co-primary efficacy measures were change from baseline in the Rett Syndrome Behavior Questionnaire (RSBQ) total score and the Clinical Global Impression-Improvement (CGI-I) score at week 12. The RSBQ is a 45-item rating scale completed by the caregiver that assesses a range of signs and symptoms of Rett syndrome. Lower scores represented lesser severity in signs and symptoms of Rett syndrome. The CGI-I is a 7-point scale rated by clinicians to assess how much a patient’s illness has improved or worsened. A decrease in CGI-I score indicates improvement.

Patients treated with Daybue demonstrated a statistically significant difference compared to placebo on the co-primary efficacy endpoints, as measured by the change from baseline in the RSBQ total score and the CGI-I score at week 12.

Safety Information

Most common adverse reactions, occurring in at least 10% of Daybue-treated patients and twice the rate of placebo, included diarrhea (81%) and vomiting (27%).

See full prescribing information for additional information on risks associated with Daybue.

Cacti from Tucson Botanical Gardens

Dried Blood Spot Testing for Biliary Atresia

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C-S Lee el al. JPGN 2023; 76: 418-423. A Pilot Study of Biliary Atresia Newborn Screening Using Dried Blood Spot Matrix Metalloproteinase-7

Methods: The study used stored DBS samples collected from 48 to 72 hours of life were retrieved from newborn screening centers in Taiwan (n=25 biliary atresia (BA), 107 non-BA)

Key findings:

  • MMP-7 levels of BA patients on the DBS were significantly higher than those of non-BA patients (19.2 ± 10.4 vs 5.6 ± 2.7 ng/mL, P value < 0.0001).
  • BA patients in this cohort underwent Kasai operation at a mean of 43 days. 32% (n=8) had surgery before 30 days of life, and 24% (n=6) had surgery after 60 days.
  • In this cohort, at time of publication, 9 (36%) of BA patients had received a liver transplantation at a mean of 2.4 years. Patients with their native liver tended to have had an earlier Kasai (38 days vs 54 days, P=0.057).

In their discussion, the authors note that BA starts very early in life. Increase in MMP-7 within 3 days of birth, supports “speculation that most BA ” may start before birth (JPGN 2019; 69: 396-403, What Is The Evidence That Biliary Atresia Starts in Utero?).

My take: Incorporating MMP-7 testing with newborn screening needs to be looked at in a bigger study. Efforts to identify BA cases earlier have largely been unsuccessful over the past several decades despite the knowledge that delayed diagnosis leads to worse outcomes.

Figure from JPGN Twitter Feed

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Tumamoc Hill, Tucson AZ

Vedolizumab for Chronic Pouchitis

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S Travis et al. NEJM 2023; 388: 1191-1200. Vedolizumab for the Treatment of Chronic Pouchitis

Methods: This was a a phase 4, double-blind, randomized trial (n=102 adults,EARNEST trial) to evaluate vedolizumab in adult patients in whom chronic pouchitis had developed after undergoing IPAA for ulcerative colitis.All patients received 4 weeks of ciprofloxacin and the treatment group received standard vedolizumab dosing. The primary end point was modified Pouchitis Disease Activity Index (mPDAI)–defined remission (an mPDAI score of ≤4 and a reduction from baseline of ≥2 points in the mPDAI total score; scores range from 0 to 12, with higher scores indicating more severe pouchitis) at week 14. The mPDAI is based on clinical symptoms and endoscopic findings.

Key findings:

  • The incidence of mPDAI-defined remission at week 14 was 31% (16 of 51 patients) with vedolizumab and 10% (5 of 51 patients) with placebo
  • Differences in favor of vedolizumab over placebo were also seen with respect to mPDAI-defined remission at week 34 (difference, 17 percentage points, 35% vs 18%)

My take: Vedolizumab is an effective treatment for chronic pouchitis.

This figure is from NEJM Twitter Feed

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Risk of Recurrent Surgery in Pediatric Crohn’s Patients

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MD Edberg et al. Crohn’s and Colitis 360, 2023; https://doi.org/10.1093/crocol/otad003 Open Access! Trends in Surgical Recurrence Among Pediatric Crohn’s Disease Patients Using Administrative Claims Data

Methods: This study analyzed postresection pediatric (≤18 years) CD patients (n=434) identified in the 2007–2018 IQVIA Legacy PharMetrics administrative claims database

Key findings:

  • Risk of surgical recurrence was 3.5%, 4.6%, and 5.3% at 1, 3, and 5 years, respectively
  • Postoperatively, patients were most commonly prescribed an immune modulator (33%), anti-tumor necrosis factor agent (32%), or antibiotic (27%)
  • 24% underwent colonoscopy 6–15 months postoperatively

My take: Current recommendations include postoperative endoscopic surveillance 6-12 months after surgery. Would the surgical recurrence rate have been lower if there had been higher postoperatively endoscopic evaluation?

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Sendero-Esperanza to Hugh Norris Trail, Saguaro National Park (Tucson, AZ)

Isolated Ileitis in Children

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A Alper et al. JPGN 2023; 76: 338-342. Isolated Terminal Ileitis in Children

This single center retrospective study reviewed 640 colonoscopies in symptomatic children.

Key findings:

  • Thirty-three children had isolated histologically-defined terminal ileitis. Seventeen children were diagnosed with CD and 18 children had idiopathic terminal ileitis (3 lost to followup)
  • Children with CD had higher prevalence of abnormal C-reactive protein levels, severe inflammation, and radiological evidence of bowel wall thickening compared with children with idiopathic ileitis.
  • Two children with idiopathic ileitis were later diagnosed with CD; the remaining 13 did not develop CD over a follow-up period of 83 months.
  • From the data presented, it appeared that the center had a low rate of ileal intubation (316 colonoscopies were excluded for this reason)
  • 75% of those with histologic ileitis had normal endoscopic appearance

When our group looked at colonoscopies (n=374) in our outpatient endoscopy center, we identified isolated ileitis in 10% (6% grossly abnormal, 4% with only histologically abnormal) (related blog post: Our Study: Provider Level Variability in Colonoscopy Yield). Higher rates of ileal intubation (90% in our study) should be considered a quality metric given that 5-10% of children may have disease isolated in ileum.

My take: This study provides reassurance that most children with histologic ileitis will not progress to CD if the ileum is visually-normal (in the absence of abnormal blood tests and/or imaging).

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Chattahoochee River, Sandy Springs, GA

How Insurance Companies Save Millions in Denying Care

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3/23/23 Propublica: How Cigna Saves Millions by Having Its Doctors Reject Claims Without Reading Them

A few excerpts:

  • Cigna, one of the country’s largest insurers…has built a system that allows its doctors to instantly reject a claim on medical grounds without opening the patient file, leaving people with unexpected bills…Over a period of two months last year, Cigna doctors denied over 300,000 requests for payments using this method, spending an average of 1.2 seconds on each case, the documents show. 
  • Before health insurers reject claims for medical reasons, company doctors must review them, according to insurance laws and regulations in many states…This process helps avoid unfair denials…Cigna adopted its review system more than a decade ago, but insurance executives say similar systems have existed in various forms throughout the industry…At UnitedHealthcare….built a similar system to let its doctors quickly deny claims in bulk.
  • Cigna eventually designated the list “PXDX” — corporate shorthand for procedure-to-diagnosis. The list saved money in two ways. It allowed Cigna to begin turning down claims that it had once paid. And it made it cheaper to turn down claims, because the company’s doctors never had to open a file or conduct any in-depth review. They simply denied the claims in bulk with an electronic signature.
  • Cigna knows that many patients will pay such bills rather than deal with the hassle of appealing a rejection [for lower cost denials]…In one corporate document, Cigna estimated that only 5% of people would appeal a denial resulting from a PXDX review.

My take: It is a hassle to appeal denials. It is not surprising to me to hear about this reporting; it confirms the fact that insurance companies are focused primarily on cost and not patient care.

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Ocotillo Cactus on the Sendero -Hugh Norris Trail, Saguaro National Park (Tucson, Az)

Consolidation and Competition in Health Care

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JS King. NEJM 388: 1057-60. On Consolidation and Competition — The Trials and Triumphs of Health Care Antitrust Law

Key points:

  • “Historically, the United States has relied nearly entirely on market competition to control prices and promote quality in health care. Yet health care markets haven’t been healthy for some time. Over the past 30 years, health care consolidation has gone largely unchecked by federal and state antitrust enforcers, which has resulted in higher prices, stagnant quality of care, and limited access to care for patients.”
  • Consolidation has been both horizontal (eg. two competitors merge), vertical (eg. hospital acquiring physician groups. or insurance acquiring pharmacy benefit manager) or cross-market (eg. merger of hospital in two separate regions)
  • “Private-equity firms have recently invested heavily in health care providers, purchasing hospitals, emergency services and staffing companies, and specialist-physician groups, such as anesthesiology groups…Studies have found that acquisitions by private-equity firms have led to consolidation and increases in hospital charges and net income.”
  • “Mergers are often justified with promises of improved quality or patient access, evidence supporting these claims is lacking.”
  • “Antitrust law aims to protect consumers and competitive markets from anticompetitive practices and the harms described above. Three federal laws — the Clayton Act, the Sherman Act, and the Federal Trade Commission Act — along with legislation in nearly all states form the foundation of antitrust law.”
  • “Despite these enforcement options, the U.S. health care industry is the most consolidated it’s ever been… In the 1990s and early 2000s, the FTC lost six consecutive horizontal hospital-merger cases…[subsequently] federal agencies didn’t challenge another hospital merger for nearly a decade.”

My take: Consolidation is happening in all components of health care, including hospitals, insurance companies, pharmaceutical companies and physician groups. This leads to higher costs, fewer choices and possibly staff shortages. At the same time, each segment of health care is incentivized to consolidate, in part for financial gain and in part to negotiate with other consolidated segments.

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AGA Practice Update: Acute Hepatic Porphyrias

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B Wang et al. Gastroenterol 2023; 164: 484-491. Open Access! AGA Clinical Practice Update on Diagnosis and Management of Acute Hepatic Porphyrias: Expert Review

Overall, acute hepatic porphyrias (AHP) are rare disorders. “Acute intermittent porphyria is the most common type of AHP, with an estimated prevalence of patients with symptoms of
approximately 1 in 100,000. The major clinical presentation involves attacks of severe pain, usually abdominal and generalized, without peritoneal signs or abnormalities on cross-sectional imaging…The screening tests of choice include random urine porphobilinogen and d-aminolevulinic acid corrected to creatinine.”

“All patients with elevations in urinary porphobilinogen and/or d-aminolevulinic acid should initially be presumed to have AHP. The cornerstones of management include discontinuation of porphyrinogenic drugs and chemicals, administration of oral or intravenous dextrose and
intravenous hemin, and use of analgesics and antiemetics. Diagnosis of AHP type can be confirmed after initial treatment by genetic testing for pathogenic variants in HMBS, CPOX, PPOX, and ALAD genes.”

Some of the best practice advice:

  • Women aged 15–50 years with unexplained, recurrent severe abdominal pain without a clear etiology after an initial workup should be considered for screening for an AHP.
  • Initial diagnosis of AHP should be made by biochemical testing measuring d-aminolevulinic acid, porphobilinogen, and creatinine on a random urine sample.
  • Genetic testing should be used to confirm the diagnosis of AHP in patients with positive
    biochemical testing.
  • Acute attacks of AHP that are severe enough to require hospital admission should
    be treated with intravenous hemin, given daily, preferably into a high-flow central vein

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Genetic Testing to Figure Out Drug Reactions

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P Nicoletti et al. Gastroenterol 2023; 164: 454-466. Open Access! Identification of Reduced ERAP2 Expression and a Novel HLA Allele as Components of a Risk Score for Susceptibility to Liver Injury Due to Amoxicillin-Clavulanate

Key findings:

  • Transcriptome-wide association study revealed a significant association of AC-DILI risk with reduced liver expression of ERAP2 (P = 3.7 × 10–7), coding for an aminopeptidase involved in antigen presentation
  • “We also identified HLA-B∗15:18 as a novel AC-DILI risk factor in both discovery (OR, 4.19) and validation (OR, 7.78) cohorts”
  • A genetic risk score incorporating rs1363907, rs2476601, HLA-B∗15:18, HLA-A∗02:01, and HLA-DRB1∗15:01, was highly predictive of AC-DILI risk when cases were analyzed against both general population and non–AC-DILI control cohorts.
  • This genetic risk score does not apply to amoxicillin. “Clavulanate has long been considered the main component causing Amoxicillin-Clavulanate-DILI (LiverTox https://www.ncbi.nlm.nih.gov/books/NBK548517/).”
  • While the genetic risk score has high specificity, it is not highly sensitive. “Our multimarker model based on the 5 risk alleles predicted approximately 13% of the total risk for AC-DILI, which is approximately one-third of the total DILI risk that has previously been attributed to common genetic variants (approximately 40%)”

My take: In cases of suspected AC-DILI, identifying an abnormal genetic risk could help confirm the diagnosis. However, due to low sensitivity it is not likely to gain widespread clinical use.

Graphical Abstract:

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