Patients with liver cancer who received immune checkpoint inhibitors (ICIs) before surgery - including those who would not have been eligible for surgery by conventional criteria - had similar outcomes to patients who received surgery upfront, according to results from a retrospective study.

The research was published in Cancer Research Communications, a journal of the American Association for Cancer Research (AACR)

Mari Nakazawa, MD, first author of the study and a clinical research fellow at the Johns Hopkins Kimmel Cancer Center; and Mark Yarchoan, MD, senior author of the study and an associate professor of oncology at the Johns Hopkins Kimmel Cancer Center

While immunotherapy has become a mainstay for the treatment of advanced or metastatic liver cancer, the primary curative treatment modality for patients with early-stage disease is surgery alone. Only around 30% of patients are eligible for surgical resection due to factors such as tumour size, proximity to critical structures, the presence of multiple tumour foci, and safety concerns, explained Nakazawa. She added that even patients who receive curative intent surgery often experience a recurrence.

“There’s a strong unmet need to expand the number of patients who may be eligible for surgery and, further, to transform more patients with early-stage liver cancer into long-term survivors of this disease,” Nakazawa said.

Studies from other cancers have shown that neoadjuvant immunotherapy may mitigate some high-risk features and help unresectable tumours meet the eligibility criteria for surgery. It may also help the immune system destroy micrometastases, thereby preventing distant recurrences later. The authors hypothesised that neoadjuvant ICI therapy may help make surgery safer and more effective in patients with high-risk, localised liver cancer.

Nakazawa, Yarchoan, and colleagues retrospectively examined outcomes from 92 patients who underwent resection for hepatocellular carcinoma at Johns Hopkins from 2017 to 2023. This included 36 patients who received neoadjuvant ICI therapy, many of whom were treated under clinical trial protocols assessing the feasibility and efficacy of immunotherapy prior to surgery. Prior to receipt of immunotherapy, 61.1% of these patients would not have been candidates for curative surgery based on traditional surgical resection criteria.

Compared with patients who received surgery upfront, patients who received neoadjuvant ICIs more commonly exhibited high-risk disease features, including high serum alpha fetoprotein, tumours larger than 5 cm, portal vein invasion, and multiple tumour foci. High-risk features have previously been associated with worse outcomes.

In this study, however, patients who received neoadjuvant ICIs - who may have been expected to have worse outcomes due to high-risk features - had comparable outcomes to patients who received upfront surgery. Among those who received neoadjuvant ICIs, 94.4% underwent successful margin-negative surgical resection, and the median recurrence-free survival was 44.8 months, compared to 49.3 months among those treated with upfront surgery. The median overall survival was not reached in either cohort.

“This study shows that the criteria by which we classify patients as being candidates for curative therapy is probably too narrow for this disease,” Yarchoan said.

The authors emphasised that these findings are retrospective and intended to be hypothesis generating, but they believe these data set a promising stage for future research. “Prospective trials that are thoughtfully designed in the right populations can help us understand which patients can benefit most from this approach,” Nakazawa said.

“Our findings demonstrate that systemic therapy may not only be useful for patients with advanced disease but can potentially be paradigm changing in patients with early-stage disease,” Yarchoan added. “There is a group of patients with high-risk liver cancer who, in a contemporary era, may have long-term survival through aggressive treatment with systemic therapy followed by surgery.”

Limitations of this study include its retrospective, single-institution nature with a relatively small sample size. Further, as the study cohort was compiled from patients treated in several different clinical trials, as well as those who underwent upfront surgery as the standard of care, factors such as baseline disease characteristics, the duration of neoadjuvant immunotherapy (if received), use of locoregional therapies, and receipt of adjuvant immunotherapy differed between patients.

Source: American Association for Cancer Research