Erin Roesch, MD
Oocyte and embryo cryopreservation are standard fertility preservation techniques, and gonadotropin-releasing hormone agonist (GnRHa) administration during chemotherapy is another strategy to preserve ovarian function. The phase 3 POEMS/S0230 study demonstrated higher pregnancy rates (5-year cumulative incidence 23.1% vs 12.2%, P = 0.03) among premenopausal patients with HR-negative early breast cancer who received GnRHa (goserelin) during chemotherapy vs chemotherapy alone. Furthermore, there was a trend towards improvement in survival outcomes with GnRHa + chemotherapy. Hypothetical concerns have existed regarding the safety of this approach, particularly in HR+ breast cancer. The PROMISE-GIM6 trial randomized 281 patients to receive chemotherapy alone or with GnRHa triptorelin (Lambertini et al) and found no difference in disease-free survival (DFS) or overall survival (OS) between GnRHa vs control groups (12-year DFS 65.7% vs 69.2%, HR 1.16; 12-year OS 81.2% vs 81.3%, HR 1.17). In patients with HR+ disease (80.4%), HR for DFS and OS was 1.02 and 1.12, respectively. The 12-year cumulative incidence of pregnancy was also higher in the GnRHa vs control group (6.5% vs 3.2%). These studies suggest no detrimental effect of GnRHa use during chemotherapy on long-term outcomes, including patients with HR+ disease, and support its role in ovarian protection.
COVID-19 has had various implications on breast cancer care, reflecting institutional policies, resources and patient preferences and potential concerns during the pandemic. A retrospective chart review of patients diagnosed at Mayo Clinic Rochester with a new breast cancer during vs pre-COVID-19, examined trends in diagnosis and treatment approaches during these times (Tonneson et al). Among 573 patients, there was no significant difference in clinical prognostic stage, although a slightly higher percentage of patients who presented with stage II-IV disease during COVID-19 vs pre-COVID-19 (29% vs 26%, P = 0.42). The use of neoadjuvant endocrine therapy (NET) significantly increased during COVID-19, and notably in patients with HR+/HER2- breast cancer (10% pre-COVID-19 vs 23% during COVID-19 (P = 0.001)) with a significant increase in stage I patients (7% vs 22%, P < 0.001). Various societies provided language to support neoadjuvant therapy as a bridge to surgical intervention during COVID-19 in the appropriate clinical scenarios. Extended follow-up of studies examining approaches utilized during the pandemic are desired to further define long-term impact on outcomes.
A pooled analysis of the PALOMA trials demonstrated progression-free survival benefit with palbociclib + endocrine therapy vs endocrine therapy alone in patients ≥65 years, and although myelosuppression was more common in patients ≥75 years, the combination remained well-tolerated. Ismail et al described real-world experience of palbociclib in older patients with advanced HR+ breast cancer. Among 598 patients, palbociclib dose reductions occurred in 33%, and those requiring a dose reduction were older vs those without dose reduction (median age 67 vs 63 years, P = 0.004). Despite higher frequency of dose reductions in older patients, this did not appear to compromise outcomes; time to next treatment was significantly longer (16.9 vs 11.6 months, P = 0.013) than younger patients but OS was similar (20.7 vs 26.7 months, P = 0.051). Although older patients may be at higher risk of toxicities due to co-morbidities or performance status limitations, palbociclib remains a valuable therapeutic option combined with endocrine therapy for advanced HR+/HER2- breast cancer.
References:
Francis PA, Pagani O, Fleming GF, et al; SOFT and TEXT Investigators and the International Breast Cancer Study Group. Tailoring adjuvant endocrine therapy for premenopausal breast cancer. N Engl J Med. 2018;379(2):122-137.
Moore HCF, Unger JM, Phillips K-A, et al. Final analysis of the prevention of early menopause study (POEMS)/SWOG Intergroup S0230. J Natl Cancer Inst. 2019;111(2):210–213.
Dietz JR, Moran MS, Isakoff SJ, et al. Recommendations for prioritization, treatment, and triage of breast cancer patients during the COVID-19 pandemic. The COVID-19 pandemic breast cancer consortium. Breast Cancer Res Treat. 2020;181(3):487–97.
Rugo HS, Turner NC, Finn RS, et al. Palbociclib plus endocrine therapy in older women with HR+/HER2- advanced breast cancer: a pooled analysis of randomised PALOMA clinical studies. Eur J Cancer. 2018;101:123e33.