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SBRT plus atezolizumab shows activity in metastatic cervical cancerRadiation plus immune therapy helps some patients with advanced cervical cancer survive longer

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Key Takeaway
Consider SBRT plus atezolizumab as an investigational option for metastatic cervical cancer, pending larger confirmatory trials.

This prospective, phase II multi-institutional trial investigated the combination of stereotactic body radiation therapy (SBRT) followed by atezolizumab (1200 mg intravenously every 3 weeks) in 21 patients with metastatic, recurrent, or persistent cervical cancer who had at least 2 distinct lesions. The primary outcome was objective response rate at the unirradiated target lesion. The median follow-up was 23.6 months.

Among the 21 patients, the best overall response included partial response in 5 patients (24%) and stable disease in 12 patients (57%). The objective response at the unirradiated target lesion was observed in 8 patients (38%). The median duration of response was 8.6 months (95% CI, 4.5-13.6 months).

Regarding safety, the most common adverse events were lymphopenia (n=6; 29%), nausea/vomiting (n=3; 14%), and hyponatremia (n=3; 14%). The regimen was described as well tolerated, though serious adverse events and discontinuations were not reported.

Key limitations include the small sample size, single-arm design, and lack of a comparator group. As a phase II trial, these results are preliminary and should not overstate efficacy. The absence of reported p-values and confidence intervals for some outcomes limits interpretation.

For clinical practice, this combination shows promise but remains investigational. Clinicians should await confirmatory data before considering this approach for patients with metastatic cervical cancer.

Patients with advanced cervical cancer often face a difficult choice. Their tumors have spread or come back, and standard treatments may not work. This new study looked at a specific approach for people with multiple spots of cancer. The team gave these patients radiation to one area and then added a drug called atezolizumab to help their immune system fight the rest of the disease. Twenty-one patients took part in this trial across several medical centers. They received the radiation treatment followed by the immune therapy every three weeks for up to 23 months. The goal was to see if this combination could slow the cancer down or shrink it.

The results showed promise for some. About 24 percent of patients saw their tumors shrink. More than half had their disease stay stable for a while. The cancer remained controlled in the untreated area for an average of 8.6 months. This means the treatment helped keep the disease from growing quickly in those who responded. Eight patients saw their cancer shrink in the specific spot that did not receive radiation. This suggests the immune therapy worked to fight the disease in other parts of the body.

Safety was a key concern for this group. The treatment was generally well tolerated. Some patients experienced side effects like low white blood cell counts, nausea, or low salt levels in their blood. These issues were manageable and did not lead anyone to stop the treatment early. No serious safety events were reported during the study. While the group was small, the findings offer a potential new path for patients who have limited options.

What this means for you:
Radiation plus immune therapy kept cancer stable for 8.6 months in some patients with advanced cervical cancer.

Study Details

Study typePhase2
Sample sizen = 10
EvidenceLevel 3
Follow-up0.7 mo
PublishedMay 2026
View Original Abstract ↓
BACKGROUND: Pembrolizumab is approved for PD-L1+ but not PD-L1 negative metastatic, recurrent, or persistent cervical cancer. Response rates to single agent anti-PD-1/PD-L1 therapy have been modest with no responses noted in PD-L1 negative tumors. METHODS AND MATERIALS: The study is designed as a prospective, phase II multi-institutional trial of stereotactic body radiation therapy (SBRT) followed by atezolizumab (1200 mg intravenously q3 weeks). Key eligibility criteria included patients with metastatic, recurrent, or persistent cervical cancer with at least 2 distinct lesions. The primary objective was objective response rate measured at the unirradiated target lesion. RESULTS: A total of 21 patients were enrolled. Median follow-up is 23.6 months. The majority of patients had adenocarcinoma (n = 10; 48%) and were PD-L1 negative (n = 15; 71%). The best overall response was a partial response in 5 (24%) and stable disease in 12 (57%) patients. The median duration of response was 8.6 months (95% CI, 4.5-13.6 months). An objective response at the unirradiated target lesion was observed in 8 patients (38%), meeting the study defined endpoint. Responses were noted in PD-L1 negative tumors. The most common grade ≥2 toxicities at least possibly attributed to study therapy included lymphopenia (n = 6; 29%), nausea/vomiting (n = 3; 14%), and hyponatremia (n = 3; 14%). CONCLUSIONS: In this first trial of SBRT and atezolizumab in metastatic cervical cancer unselected for PD-L1, combination therapy was well tolerated. Responses were noted in PD-L1 negative tumors. Combination therapy may allow for improved response rates to immune checkpoint inhibition in metastatic cervical cancer particularly in PD-L1 negative tumors.
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