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Hologic, Inc. (Nasdaq: HOLX) announced today that in a new study, women treated with NovaSure® endometrial ablation reported a higher one-year amenorrhea (absence of menstruation) rate, better quality of life (QoL) post-procedure, and greater satisfaction than women treated with Minerva endometrial ablation.1 The full study results are published in the peer-reviewed International Journal of Women’s Health, available at

The multi-center, IRB-approved retrospective case control study surveyed 189 pre-menopausal women who underwent endometrial ablation in accordance with FDA-approved use of either the NovaSure or Minerva device (97 NovaSure and 92 Minerva).1 The primary efficacy outcome was the percentage of patients experiencing amenorrhea post-ablation; the mean follow-up was 11.3 months (range 137 – 532 days). Secondary efficacy outcomes were change in abnormal uterine bleeding (AUB) symptom severity from baseline, the percentage of patients requiring secondary intervention (medical or surgical) for refractory AUB, and patient satisfaction level.1 The primary safety-related outcome was the incidence of perioperative adverse events, which included, among others, pain, fever, nausea, vomiting, vaginal bleeding, and vaginosis.1

Study Results

  • The subject-reported amenorrhea rate was 52% higher in NovaSure patients than in Minerva patients (64% and 42%, respectively; p=0.004).1
  • Bleeding reduction in women with AUB was comparable with both endometrial ablation systems (97% and 92%, respectively; p=0.2039).1
  • Mean days per cycle with any reported bleeding were comparably reduced in both groups, from 9.0 – 9.5 days to 4.8 – 5.5 days.1
  • Diminished bleeding after ablation was reflected in the overall reduction in self-reported sanitary products used in both the NovaSure and Minerva groups (78% and 61%, respectively; p=0.049).1
  • The post-ablation incidence of menstrual pain reported was lower in the NovaSure group versus the Minerva group (21% and 41%, respectively; p=0.003).1
  • After NovaSure ablation, 85% of women who initially experienced Pre-Menstrual Syndrome (PMS) reported improvement vs. 68% in the Minerva group (p=0.019).1
  • Endometrial ablation lowered the impact of menstrual bleeding on subject QoL in both NovaSure and Minerva groups. The average postoperative impact score was improved (lower) in NovaSure versus Minerva subjects (0.3 points and 0.7 points, respectively; p=0.012).1
  • 94% of NovaSure patients reported some level of satisfaction with clinical outcomes versus 78% of Minerva patients (p=0.003). Additionally, a larger proportion of NovaSure patients said they would “definitely recommend the procedure to a friend” compared to Minerva patients (92% and 78%, respectively; p=0.013).1
  • The primary safety-related outcome was the incidence of perioperative AEs; 5 Minerva patients and 10 NovaSure patients (p=0.284) experienced postoperative adverse events, including, pain, fever, nausea, vomiting, vaginal bleeding, acute renal failure, urinary tract infection and vaginosis, with onsets occurring within 14 days after ablation.1
  • A total of 5 additional gynecologic procedures were performed in 4 NovaSure subjects and 4 procedures in 3 Minerva subjects (p > 0.05).1
  • Categorical variables were assessed with Fisher’s Exact test. Continuous variables were compared by Student’s t-test; p-values <.05 indicated statistically significant differences.1

NovaSure Pivotal Study Information

The pivotal study supporting FDA approval of the NovaSure system on September 28, 2001 was a randomized, prospective, multi-center clinical study, in which the NovaSure system was compared to a control arm of wire loop resection plus rollerball endometrial ablation (hysteroscopic endometrial ablation). A total of 265 patients were enrolled in the study, with 175 being randomized into the NovaSure study arm. The NovaSure study arm reported 1-year success rates of 77.7% and 1-year amenorrhea rates of 36%. Patient success was based on a reduction in a menstrual diary score from ≥ 150 pre-treatment to ≤ 75 at one-year post-treatment, using a validated menstrual dairy scoring system developed by Higham.11 Patient satisfaction was assessed by administering Quality of Life (SF-12 Questionnaire) and Menstrual Impact questionnaires prior to treatment and at 3, 6 and 12 months post-treatment, with 92.8% of NovaSure patients reporting being satisfied or very satisfied with the procedure after 1 year.


  1. Constantine Scordalakes, MD, Robert delRosario, MD, et al. Efficacy and patient satisfaction after NovaSure and Minerva endometrial ablation for treating abnormal uterine bleeding: a retrospective comparative study. International Journal of Women’s Health. 2018.
  2. Committee on Practice Bulletins—Gynecology. Practice bulletin no. 128: diagnosis of abnormal uterine bleeding in reproductive-aged women. Obstet Gynecol. 2012;120:197-206. doi: 10.1097/AOG.0b013e318262e320
  3. Kuppermann M, Varner RE, Summitt RL Jr, Learman LA, Ireland C, Vittinghoff E, Stewart AL, Lin F, Richter HE, Showstack J, Hulley SB, Washington AE; Ms Research Group. Effect of hysterectomy vs medical treatment on health-related quality of life and sexual functioning. JAMA. 2004;291:1447-55.
  4. Bradley LD, Gueye NA. The medical management of abnormal uterine bleeding in reproductive-aged women. Am J Obstet Gynecol. 2016;214:31-44. doi: 10.1016/j.ajog.2015.07.044
  5. Wallace SK, Fazzari MJ, Chen H, Cliby WA, Chalas E. Outcomes and Postoperative Complications After Hysterectomies Performed for Benign Compared With Malignant Indications. Obstet Gynecol. 2016;128:467-75. doi: 10.1097/AOG.0000000000001591
  6. Thakar R, Sultan AH. Hysterectomy and pelvic organ dysfunction. Best Pract Res Clin Obstet Gynaecol. 2005;19:403-18.
  7. Ingelsson E, Lundholm C, Johansson AL, Altman D. Hysterectomy and risk of cardiovascular disease: a population-based cohort study. Eur Heart J. 2011;32:745-50. doi: 10.1093/eurheartj/ehq477
  8. Daniels JP, Middleton LJ, Champaneria R, Khan KS, Cooper K, Mol BW, Bhattacharya S; International Heavy Menstrual Bleeding IPD Meta-analysis Collaborative Group. Second generation endometrial ablation techniques for heavy menstrual bleeding: network meta-analysis. BMJ. 2012;344:e2564. doi: 10.1136/bmj.e2564
  9. Lethaby A, Penninx J, Hickey M, Garry R, Marjoribanks J. Endometrial resection and ablation techniques for heavy menstrual bleeding. Cochrane Database Syst Rev. 2013;8:CD001501. doi: 10.1002/14651858.CD001501.pub4
  10. Fergusson RJ, Lethaby A, Shepperd S, Farquhar C. Endometrial resection and ablation versus hysterectomy for heavy menstrual bleeding. Cochrane Database Syst Rev. 2013;11:CD000329. doi: 10.1002/14651858.CD000329.pub2
  11. Higham JM, O’Brian PMS, Shaw RW. Assessment of menstrual blood loss using a pictorial chart BR J Obstet Gynaecol 1990; 97:734-9