The initial choice of nab-paclitaxel was to avoid corticosteroids typically given with paclitaxel, which would contradict relacorilant's mechanism. However, current practice often omits steroids with weekly paclitaxel, suggesting the combination might be feasible, broadening its potential application.

The efficacy of relacorilant, a glucocorticoid antagonist, has raised concerns that routine steroid use with chemotherapy may induce resistance. This has led clinicians to reduce steroid doses, questioning a long-standing practice and its potential to blunt the therapeutic effects of chemotherapy.

The persistent separation of survival curves in the ROSELLA trial suggests relacorilant's benefit extends beyond sensitizing tumors to chemotherapy. By acting as a glucocorticoid receptor antagonist and blocking immunosuppressive cortisol, it may also have a favorable immune-modulatory effect.

The ROSELLA trial's success in boosting chemotherapy with a glucocorticoid receptor antagonist is thought-provoking. It suggests that routinely used steroids for managing side effects like nausea might inadvertently be diminishing chemotherapy's effectiveness across various cancers.

The novel drug relacorilant overcomes taxane resistance in ovarian cancer by targeting glucocorticoid receptors. It blocks stress-induced steroid signaling that promotes anti-apoptotic proteins, effectively re-sensitizing tumors to chemotherapy. This represents a completely new mechanism of action for this patient population.

The modest benefit of PARP inhibitors in metastatic breast cancer, compared to ovarian cancer, is likely due to resistance induced by prior exposure to DNA-damaging agents like anthracyclines. This explains the clinical rationale for moving PARP inhibitors to earlier treatment settings, such as neoadjuvant or adjuvant therapy, before resistance develops.

While high glucocorticoid receptor (GR) expression is linked to chemoresistance and worse outcomes in ovarian cancer, clinical data found no correlation between GR levels and patient benefit from the GR antagonist relacorilant. This finding means no predictive biomarker test is required to select patients for this therapy.

The glucocorticoid receptor antagonist relacorilant does not require biomarker testing for patient selection. Its target is ubiquitously expressed in over 95% of ovarian cancer tissues, making it a broadly applicable therapy without the need for additional screening.

High cortisol, a stress hormone, is linked to worse outcomes in ovarian cancer. Relacorilant, by blocking its receptor, appears to overcome chemo resistance by allowing the body's own immune system to help fight the cancer.