Although ribociclib + letrozole was also associated with a numerically greater PFS than palbociclib + letrozole, this difference did not reach statistical significance.
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Matching-adjusted indirect comparison of PFS and OS comparing ribociclib plus letrozole <i>versus</i> palbociclib plus letrozole as first-line treatment of HR+/HER2- advanced breast cancer.
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The sentences
The addition of variances may, to some extent, widen the CIs, thus making some relationships that may be significant otherwise become nonsignificant.