online supplementary material only - TRASGU2 DOI. 10.1159_000514808.pdf (1.91 MB)
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Supplementary Material for: External Validity of Somatostatin Analogs Trials in Advanced Neuroendocrine Neoplasms: The GETNE-TRASGU Study

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posted on 29.04.2021, 05:26 by Jimenez-Fonseca P., Carmona-Bayonas A., Lamarca A., Barriuso J., Castaño A., Benavent M., Alonso V., Riesco M.C., Alonso-Gordoa T., Custodio A., SanchezCanovas M., Hernando J., López C., LaCasta A., FernandezMontes A., Marazuela M., Crespo G., Diaz J.A., Feliciangeli E., Gallego J., Llanos M., Segura A., Vilardell F., Percovich J.C., Grande E., Capdevila J., Valle J., Garcia-Carbonero R.
Introduction: Somatostatin analogs (SSA) prolong progression-free survival (PFS) in patients with well-differentiated gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs). However, the eligibility criteria in randomized clinical trials (RCTs) have been restricted, which contrasts with the vast heterogeneity found in NENs. Methods: We identified patients with well-differentiated (Ki-67% ≤20%), metastatic GEP-NENs treated in first line with SSA monotherapy from the Spanish R-GETNE registry. The therapeutic effect was evaluated using a Bayesian Cox model. The objective was to compare survival-based outcomes from real-world clinical practice versus RCTs. Results: The dataset contained 535 patients with a median age of 62 years (range: 26–89). The median Ki-67% was 4 (range: 0–20). The most common primary tumor sites were as follows: midgut, 46%; pancreas, 34%; unknown primary, 10%; and colorectal, 10%. Half of the patients received octreotide LAR (n = 266) and half, lanreotide autogel (n = 269). The median PFS was 28.0 months (95% CI: 22.1–32.0) for octreotide versus 30.1 months (95% CI: 23.1–38.0) for lanreotide. The overall hazard ratio for lanreotide versus octreotide was 0.90 (95% credible interval: 0.71–1.12). The probability of effect sizes >30% with lanreotide versus octreotide was 2 and 6% for midgut and foregut NENs, respectively. Conclusion: Our study evaluated the external validity of RCTs examining SSAs in the real world, as well as the main effect-modifying factors (progression status, symptoms, tumor site, specific metastases, and analytical data). Our results indicate that both octreotide LAR and lanreotide autogel had a similar effect on PFS. Consequently, both represent valid alternatives in patients with well-differentiated, metastatic GEP-NENs.

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