ENDO 2026, the Endocrine Society's 108th annual meeting, ran June 13-16, 2026 at McCormick Place West in Chicago, drawing roughly 7,200 attendees and nearly 2,500 abstracts across diabetes, obesity, reproductive health, bone health, endocrine-disrupting chemicals, and thyroid cancer.
For peptide therapeutics, ENDO 2026 carried the cleanest endocrinology showdown in years. Three rival PTH-peptide replacement programs converged on the same hall in chronic hypoparathyroidism: Ascendis Pharma's TransCon PTH (palopegteriparatide) 5-year PaTH Forward data, MBX Biosciences's once-weekly canvuparatide Phase 2 Avail + 1-year OLE results, and Entera Bio's late-breaking EB613 oral PTH(1-34) single-tablet data. Crinetics presented six abstracts including up to two years of PATHFNDR-1 and PATHFNDR-2 open-label-extension data for Palsonify (paltusotine) on June 14, the second-generation oral acromegaly therapy that took commercial market share after Camurus's Oclaiz drew a second manufacturing CRL on June 10. Entera also surfaced preclinical EB618 oral GLP-1/glucagon non-human primate data on Saturday, June 13.
Stories here cover the program lineup and the readouts from sponsoring companies. See [[hypoparathyroidism]], [[acromegaly]], and [[oral-peptide]] for adjacent threads.
Marea Therapeutics (Endocrine News Pharma Friday, June 19) released Phase 1 first-in-human data for MAR002, a first-in-class half-life-extended allosteric human monoclonal antibody growth hormone receptor antagonist (GHRA), at ENDO 2026 in Chicago. The Phase 1 readout supports a potential best-in-disease profile across safety, tolerability, pharmacodynamic IGF-1 lowering, and pharmacokinetics, with a long duration of action compatible with infrequent subcutaneous dosing — potentially once every two weeks — versus the daily subcutaneous administration required for pegvisomant (Somavert). MAR002 sits at the intersection of acromegaly's existing somatostatin (octreotide, lanreotide, Palsonify), GH-receptor (pegvisomant), and dopamine agonist (cabergoline) approaches and reframes the GHR antagonist class around an antibody, not a pegylated protein. Acromegaly's US/EU prevalence is roughly 40-70 per million.
An analysis of 60,000+ Americans with type 2 diabetes, presented at ENDO 2026 by Sainikhil Sontha (Boston University School of Public Health) and published in the Endocrine Society press release stream, found that 40% of GLP-1 users discontinued the medication within 12 months and roughly 60% had stopped by the end of two years. Among those who stopped, 41.5% restarted within a year and 58% within two years. Discontinuation was higher among Medicaid/Medicare beneficiaries, Black patients, and patients with documented nausea or GI side effects (37% of stoppers). Newer-generation tirzepatide users were 41% less likely to discontinue than liraglutide users, and patients whose first GLP-1 was prescribed by an endocrinologist were 10% less likely to stop. The data complement the Cleveland Clinic 8,000-patient real-world finding (March) and the eClinicalMedicine Budini meta-regression on weight-regain trajectory, sharpening the picture of how GLP-1 therapy churn actually unfolds in US insurance-claims populations.
Recordati Rare Diseases presented four poster analyses at ENDO 2026 from the LINC clinical program for ISTURISA (osilodrostat), the oral 11β-hydroxylase inhibitor approved for Cushing's syndrome. The posters covered patient-reported quality-of-life improvements, biochemical control durability, real-world treatment outcomes across LINC 3 and LINC 4 study extensions, and clinical responses across the heterogeneous Cushing's syndrome population. ISTURISA was approved in March 2020 for Cushing's disease and expanded to broader Cushing's syndrome in April 2025; the LINC 3 pivotal study showed 86% of patients normalized urinary free cortisol after eight weeks of randomized withdrawal versus 29% with placebo. Endogenous Cushing's syndrome remains an ultra-rare endocrine disorder with limited therapeutic alternatives (ketoconazole, metyrapone, mifepristone, pasireotide).
Entera Bio (Nasdaq: ENTX) presented full single-tablet EB613 results on June 14 at ENDO 2026 in Chicago as a late-breaking oral. The single-tablet EB613 achieved a comparable pharmacokinetic and pharmacodynamic profile to Forteo (injectable teriparatide) and to the multi-tablet EB613 used in Entera's earlier Phase 2 study in postmenopausal women with osteoporosis. On the administration-experience quality-of-life questionnaire, 14 of 15 study participants preferred the single tablet to the multi-tablet format, and all 15 preferred the daily oral EB613 to the daily injection. Entera plans to advance the single-tablet formulation into the Phase 3 trial in 750 postmenopausal women starting late 2026, with topline expected H2 2028.
Rhythm Pharmaceuticals (Nasdaq: RYTM) presented seven setmelanotide abstracts at ENDO 2026 covering three rare-disease patient populations. Christian Roth (Seattle Children's) reported 2.5-year Phase 2 + long-term extension data in acquired hypothalamic obesity showing -18.9% mean BMI reduction across all 11 participants. The PWS interim Phase 2 (June 13) reported across 17 patients (10 adult, 7 pediatric) showed 3.11% mean BMI reduction in adults and 3.00% in pediatric patients, with 8 of 10 baseline-hyperphagic patients hitting a 7-point HQ-CT reduction, and 4.19% fat-mass loss with 0.74% lean-mass gain across 16 DEXA evaluations. Two BBS late-breaking posters from Caroline Huber covered real-world hyperphagia and healthcare-utilization outcomes from the 6-month RESTORE study. All three indications reinforce the MC4R-agonist rationale for Phase 3.
Crinetics Pharmaceuticals (Nasdaq: CRNX) presented on June 14 full results from its 12-week Phase 2 trial of atumelnant (CRN04894) in adults with classic congenital adrenal hyperplasia (CAH), the company's investigational once-daily oral ACTH receptor antagonist. The data showed rapid, substantial, and sustained statistically significant reductions in CAH disease biomarkers including androstenedione and 17-hydroxyprogesterone, with patients able to reduce glucocorticoid doses while maintaining androgen control. A separate Phase 1b/2a interim analysis in ACTH-dependent Cushing's syndrome showed that atumelnant rapidly lowered early-morning cortisol and normalized urinary free cortisol even at lower doses. Both programs are advancing toward Phase 3.
Neurocrine Biosciences (Nasdaq: NBIX) presented two-year data from CAHtalyst Pediatric showing durable hormone control, reduced glucocorticoid exposure, and improved growth measures in pediatric patients with classic congenital adrenal hyperplasia (CAH), with weight, insulin resistance, and bone-age outcomes also improved at year 2. Separately, Neurocrine announced the first retrospective case series of CRENESSITY (crinecerfont) in patients with classic CAH due to 11β-hydroxylase deficiency, the second-most-common form of CAH after 21-hydroxylase deficiency, accounting for roughly 5% of cases. The 11β-OHD subtype was not previously studied in the crinecerfont trials and is characterized by cortisol deficiency plus excess adrenal androgens and accumulation of 11-deoxycortisol and 11-deoxycorticosterone. Crinecerfont is a small-molecule CRF1 receptor antagonist that dampens the CRH-ACTH peptide signaling axis.
Crinetics Pharmaceuticals (Nasdaq: CRNX) presented data on June 14 from up to two years of efficacy and pooled safety follow-up in the PATHFNDR-1 and PATHFNDR-2 open-label extensions of Palsonify, the once-daily oral SST2 nonpeptide agonist for acromegaly. Palsonify maintained lowered IGF-1 levels, stable symptoms, and stable or reduced pituitary tumor volumes through 48 weeks across 167 patients. Pooled safety data identified no new safety signals; common adverse events were diarrhea, arthralgia, headache, and UTI. A separate ACROBAT Advance analysis showed safety and efficacy with up to four years of Palsonify + oral cabergoline combination therapy in patients whose IGF-1 had not normalized on Palsonify alone. With Camurus's rival monthly octreotide depot Oclaiz pushed to a 2027 US launch after the June 10 second CRL, Palsonify now stands alone as the next-generation acromegaly therapy in the US market.
A Stanford-led retrospective pre-post cohort study presented June 13 at ENDO 2026 in Chicago used NIH All of Us Research Program data linking electronic health records with Fitbit activity in 1,950 adults with obesity who started GLP-1 medications. Among the 753 with sufficient wearable data, mean daily steps dropped from 5,047 before GLP-1 initiation to 4,487 after (-560 steps, p<0.001); moderate-to-vigorous activity fell from 27.9 to 22.2 minutes per day (-5.7 minutes, p<0.001). The largest declines occurred in men and in people with pre-existing joint or muscle pain; age, heart failure, and stroke history did not change the pattern. Lead author Surya Maharjan flagged the activity drop as a concern given GLP-1-associated lean-mass loss.
Stanford University researchers presented retrospective cohort data at ENDO 2026 on June 13 from the Atropos Health Eos electronic health record dataset (~161 million patients seen in US community hospitals and academic medical centers, January 2016 to December 2023). Among adults with type 2 diabetes and no prior fractures or osteoporosis medication use, semaglutide was associated with a 15% lower fracture risk and greater weight loss versus other anti-obesity medications. Principal investigator Jairo Noreña framed the work as an early signal that semaglutide-driven weight loss may protect bone health in T2D, with prospective studies needed to confirm.
Ascendis Pharma (Nasdaq: ASND) presented a subgroup analysis from the registrational ApproaCH trial of once-weekly TransCon CNP (navepegritide, brand name YUVIWEL) at ENDO 2026 in Chicago showing sustained annualized growth velocity (AGV) gains through two years of treatment in children 5 years and older with achondroplasia. Investigators reported significantly greater AGV at week 52 versus placebo with improvements sustained through year two. TransCon CNP was FDA-approved in February 2026 under the YUVIWEL brand to increase linear growth in pediatric patients 2 years of age and older with achondroplasia and open epiphyses. The C-natriuretic peptide prodrug is the second TransCon-platform asset approved after TransCon hGH (Skytrofa) for pediatric growth hormone deficiency.
A research team from University Hospitals Coventry and Warwickshire and Warwick Medical School presented meta-analysis data from randomized controlled trials at ENDO 2026 on June 14 showing that 24 weeks of GLP-1 receptor agonist treatment improved testosterone levels, sperm count, and sperm morphology in men ages 18 to 65 with obesity-related low testosterone. Principal investigator Pratibha Natesh proposed reduced inflammation and metabolic stress as candidate mechanisms, with the GLP-1 class potentially preferable to testosterone replacement therapy in this population because TRT can suppress endogenous sperm production. The findings were drawn from men with high BMI, so external validity to normal-weight populations is unclear.
Ascendis Pharma (Nasdaq: ASND) released June 11 the 5-year (Week 266) results from its Phase 2 PaTH Forward trial of TransCon PTH (palopegteriparatide) in adults with chronic hypoparathyroidism, ahead of formal presentation at ENDO 2026 in Chicago. At Week 266, 82% of patients met the composite endpoint of normal serum calcium without active vitamin D and with less than 600 mg/day of calcium; nearly all participants achieved independence from conventional therapy, and 95% completed the full five years. TransCon PTH replicated endogenous PTH across kidney, intestine, CNS, and bone, with normalized urine and serum calcium, sustained bone mineral density, and quality-of-life gains. The data directly stress-tests MBX Biosciences's once-weekly canvuparatide Phase 2 readout from June 12, which posted 63% responder at 12 weeks and 57% at one year.
Crinetics Pharmaceuticals (Nasdaq: CRNX) will present an oral abstract Sunday June 14 (1:45-3:15 PM CT, Room W183BC) covering up to two years of efficacy and pooled safety data from the Palsonify (once-daily oral paltusotine) PATHFNDR-1 and PATHFNDR-2 open-label extensions in acromegaly, plus long-term combination data with cabergoline from the ACROBAT Advance trial. The presentation lands four days after Camurus's second Complete Response Letter on Oclaiz (CAM2029), the rival monthly subcutaneous octreotide depot, leaves the US acromegaly market with only one approved next-generation entrant (Palsonify, approved September 2025) through at least H1 2027. Crinetics will also present six total abstracts at ENDO including Phase 2 atumelnant data in congenital adrenal hyperplasia and ACTH-dependent Cushing's syndrome.
Entera Bio (Nasdaq: ENTX) confirmed that its first-in-class oral PTH(1-34) tablet EB613 was selected for a late-breaking oral presentation at ENDO 2026 covering single-tablet data ahead of the 750-patient Phase 3 trial set to start late 2026 in postmenopausal osteoporosis. EB613 applies Entera's N-Tab oral-peptide delivery platform to teriparatide (the active ingredient in Forteo). On the obesity side, Entera will present preclinical PK/PD data on EB618, a first-in-class oral dual GLP-1/glucagon receptor agonist, in non-human primates on Saturday June 13 12:15-1:45 PM CT. The ENDO slot extends Entera's spring narrative beyond the Q1 2026 Phase 3 plan first disclosed in May.
The Endocrine Society's annual meeting ENDO 2026 opened today at McCormick Place West in Chicago and runs through Tuesday June 16, drawing roughly 7,200 attendees and nearly 2,500 abstracts spanning diabetes, obesity, reproductive health, bone health, endocrine-disrupting chemicals, and thyroid cancer. Saturday's plenary 'Unraveling Hormonal Complexity: Genomics, Sex Differences, and Physiology' features I. Sadaf Farooqi (Cambridge) on single-cell genomics and Holly A. Ingraham (UCSF) on hormones and brain-body physiology. Peptide-anchored programs concentrated in the hypoparathyroidism (Ascendis, MBX, Entera), acromegaly (Crinetics), and oral GLP-1 (Entera EB618 preclinical) tracks; oncology-peptide tracks include OAR-targeted radioligand abstracts and copper-peptide bone-resorption work.