Journal of the National Cancer Institute · 2025
Impact of radiation therapy dose, fractionation, and immunotherapeutic partner in a mouse model of hormone receptor-positive mammary carcinogenesis.
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Buqué Aitziber, Bloy Norma, Petroni Giulia, Jiménez-Cortegana Carlos, Sato Ai, Iribarren Cristina, Yamazaki Takahiro, Galassi Claudia, Hensler Michal, Bhinder Bhavneet, Guarracino Andrea, Rippon Brady, Beltran-Visiedo Manuel, Soler-Agesta Ruth, Pannellini Tania, Fucikova Jitka, Demaria Sandra, Zhou Xi Kathy, Elemento Olivier, Formenti Silvia C, Galluzzi Lorenzo
Аннотация
BACKGROUND: Hormone receptor-positive (HR+) breast cancer responds poorly to immune checkpoint inhibitors (ICIs). In some settings, radiation therapy (RT) has been shown to mediate immunostimulatory effects and promote ICI sensitivity.
METHODS: We investigated whether hypofractionated RT may be successfully combined with ICIs in a mouse model of multifocal, metachronous HR+ mammary carcinogenesis. We hypothesized that focal RT targeting the first detectable (primary) tumor combined with ICIs may generate effective immunity, delaying the development of new lesions.
RESULTS: Focal RT in various doses and fractionations limited primary tumor growth, with an optimum for a 20-Gy × 2 regimen (ablative in approximately 90% of mice). The degree of primary disease control, however, did not necessarily correlate with overall survival extension because of changes in the development of new neoplastic lesions contributing to global tumor burden. Adding a PD-1 blocker to focal RT delivered in a 10-Gy × 3, 20-Gy × 2, or 8-Gy × 6 regimen failed to alter overall survival extension enabled by RT alone. Similar results were obtained with a CTLA4 blocker, an IL-1β inhibitor, and a PD-1 blocker plus recombinant FLT3LG when combined with the 10-Gy × 3 regimen.
CONCLUSIONS: In this model of HR+ mammary carcinogenesis, RT to the primary tumor ameliorates overall survival (to an extent based on dose and fractionation). Increasing local control through RT alone or RT plus immunotherapy beyond a hitherto undefined threshold, however, does not necessarily inhibit the development of subsequent nonirradiated neoplasms and hence does not necessarily provide extra overall survival benefits.
METHODS: We investigated whether hypofractionated RT may be successfully combined with ICIs in a mouse model of multifocal, metachronous HR+ mammary carcinogenesis. We hypothesized that focal RT targeting the first detectable (primary) tumor combined with ICIs may generate effective immunity, delaying the development of new lesions.
RESULTS: Focal RT in various doses and fractionations limited primary tumor growth, with an optimum for a 20-Gy × 2 regimen (ablative in approximately 90% of mice). The degree of primary disease control, however, did not necessarily correlate with overall survival extension because of changes in the development of new neoplastic lesions contributing to global tumor burden. Adding a PD-1 blocker to focal RT delivered in a 10-Gy × 3, 20-Gy × 2, or 8-Gy × 6 regimen failed to alter overall survival extension enabled by RT alone. Similar results were obtained with a CTLA4 blocker, an IL-1β inhibitor, and a PD-1 blocker plus recombinant FLT3LG when combined with the 10-Gy × 3 regimen.
CONCLUSIONS: In this model of HR+ mammary carcinogenesis, RT to the primary tumor ameliorates overall survival (to an extent based on dose and fractionation). Increasing local control through RT alone or RT plus immunotherapy beyond a hitherto undefined threshold, however, does not necessarily inhibit the development of subsequent nonirradiated neoplasms and hence does not necessarily provide extra overall survival benefits.