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Original research
Nomogram to predict feasibility of minimally invasive interval debulking surgery in advanced ovarian cancer
  1. Carmine Conte1,2,
  2. Andrea Rosati1,
  3. Claudia Marchetti1,2,
  4. Valentina Iacobelli2,
  5. Lorena Quagliozzi1,
  6. Valeria Gallucci1,
  7. Salvatore Gueli Alletti1,
  8. Giovanni Scambia1,2 and
  9. Anna Fagotti1,2
  1. 1Dipartimento Scienze della Salute della Donna, del Bambino e di Sanità Pubblica, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Roma, Italy
  2. 2Dipartimento Scienze della Vita e Sanità Pubblica, Università Cattolica del Sacro Cuore, Roma, Italy
  1. Correspondence to Professor Giovanni Scambia, Dipartimento Scienze della Salute della Donna, del Bambino e di Sanità Pubblica, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Roma, Italy; giovanni.scambia{at}policlinicogemelli.it

Abstract

Objective Currently, there is no clear guidance defining the ideal candidate for minimally invasive interval debulking surgery. This study aimed to identify predictive factors for a minimally invasive approach in patients with advanced ovarian cancer who are candidates for interval debulking surgery after neoadjuvant chemotherapy.

Methods This was a single institution retrospective study conducted between January 2014 and June 2020 Perioperative variables were used to predict the likelihood of minimally invasive interval debulking surgery using multivariable models. A nomogram was developed, and internal validation was performed using the bootstrapping correction technique. This nomogram was built to visualize the effect of perioperative variables on the estimated probability of minimally invasive interval debulking surgery in patients with a clinical response after neoadjuvant chemotherapy. We used the four significant perioperative variables according to logistic regression.

Results A total of 108 (28.4%) and 272 (71.6%) patients underwent interval debulking surgery by a minimally invasive or open approach, respectively. Absence of omental cake (odds ratio (OR) 9.15, 95% confidence interval (CI) 4.26 to 19.64, p<0.001), high volume surgeon (OR 5.43, 95% CI 2.75 to 10.71, p<0.001), less than two peritoneal sites involved (OR 2.94, 95% CI 1.34 to 6.43, p=0.007), and CA125 normalization (OR 1.79, 95% CI 1.05 to 3.36, p=0.049) correlated with the feasibility of minimally invasive interval debulking surgery at multivariate analysis. The calibration plot demonstrated good agreement between the predicted and actual probability of minimally invasive interval debulking surgery (p=0.93, Hosmer–Lemeshow test).

Conclusions Our nomogram may serve as a useful tool to choose the surgical approach in patients with advanced ovarian cancer undergoing interval debulking surgery.

  • ovarian cancer
  • cytoreduction surgical procedures
  • gynecologic surgical procedures

Data availability statement

All data relevant to the study are included in the article or uploaded as supplementary information.

https://doi.org/10.1136/ijgc-2021-002908

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    Data availability statement

    All data relevant to the study are included in the article or uploaded as supplementary information.

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    Footnotes

    • Twitter @annafagottimd

    • Contributors CC, AR, and CM conceived the presented idea, developed the theory, and performed the computations. VI and LQ verified the analytical methods and performed the data collection and patient recruitment. VG and SGA gave support for the statistical analysis and in the draft of the paper. GS and AF supervised the findings of this work. GS is responsible for the overall content as the guarantor. All authors discussed the results and contributed to the final manuscript.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial, or not-for-profit sectors.

    • Competing interests None declared.

    • Provenance and peer review Not commissioned; externally peer reviewed.