Study results presented at this month’s San Antonio Breast Cancer Symposium highlighted several advances in the treatment of breast cancer.
CURE® selected some of the top stories from our coverage of the breast cancer meeting, which included topics such as advanced breast cancer, side effects in older patients, circulating tumor DNA (ctDNA) detection and more.
Time to Next Treatment Slightly Higher With Orserdu in Breast Cancer Subset
Glossary
Progression-free survival: time during which a patient’s disease does not worsen.
Real-world time to next treatment: time from starting treatment to starting the next therapy.
Real-world time to treatment discontinuation: time from starting treatment to stopping it for any reason.
Circulating tumor DNA: traces of cancer cells remaining in the bloodstream.
Neoadjuvant: treatment given before surgery.
Residual cancer burden score: a system that estimates how much cancer will be left in the body after neoadjuvant treatment. A score of zero means there’s no residual cancer, whereas a score of 3 means there’s an extensive amount of residual cancer.
QLQ-C30 GHS score: a score measuring a patient’s quality of life, with higher scores representing a higher quality of life.
G8 score: a screening tool used to evaluate older patients.
A real-world analysis found that Orserdu (elacestrant) yielded comparable or slightly better time to treatment discontinuation and time to next treatment than the progression-free survival (PFS) reported in the phase 3 EMERALD trial for patients with HR-positive/HER2-negative advanced breast cancer and ESR1 mutations.
An analysis of 742 patients receiving Orserdu (mean age, 63 years) showed a median real-world time to next treatment (rwTTNT) of 6.43 months and a median real-world time to treatment discontinuation (rwTTD) of 4.6 months.
Although most patients received Orserdu in the third or fourth line of treatment, the treatment line did not substantially affect outcomes. Median rwTTNT ranged from 5.9 to 8.8 months, and median rwTTD ranged from 4.5 to 5.3 months across the second, third and fourth lines.
Older Patients With Early Breast Cancer May Have Worse Immune Side Effects
Researchers presented findings from a multi-institutional study suggesting a potential link between prior immune checkpoint inhibitor use in early-stage breast cancer and an increased risk of high-grade immune-related side effects in older patients.
In patients with early-stage breast cancer treated with immune checkpoint inhibitors, 72.6% experienced any-grade immune-related side effects, and 18.9% experienced high-grade effects. While the majority (81%) experienced no high-grade events, 17% experienced one and 1.7% experienced two. No patients experienced more than two high-grade side effects. The distribution of any-grade events was as follows: none (27%), one (43%), two (23%), three (5.7%), four (1.2%) and five (0.2%).
Ultra-Sensitive Testing Can Detect ctDNA in HR-Positive Breast Cancer
Findings from a phase 2 trial demonstrated ctDNA detection using an ultra-sensitive tissue-free method in patients with HR-positive early breast cancer.
Baseline ctDNA was associated with larger pathological tumor size and higher residual cancer burden scores after neoadjuvant endocrine therapy. Dr. Albert Grinshpun and colleagues also reported that detectable ctDNA after treatment correlated with higher recurrence rates.
In the phase 2 PELOPS trial, 49 patients with stage 1 to 3 HR-positive, HER2-negative breast cancer were randomly assigned to receive either neoadjuvant endocrine therapy in combination with Ibrance (palbociclib; 35 patients) or neoadjuvant endocrine therapy alone (13 patients).
