- Tobin, Joshua W. D.; Keane, Colm; Gunawardana, Jay; Mollee, Peter; Birch, Simone; Thanh Hoang; Lee, Justina; Li, Li; Huang, Li; Murigneux, Valentine; Fink, J. Lynn; Matigian, Nicholas; Vari, Frank; Francis, Santiyagu; Kridel, Robert; Weigert, Oliver; Haebe, Sarah; Jurinovic, Vindi; Klapper, Wolfram; Steidl, Christian; Sehn, Laurie H.; Law, Soi-Cheng; Wykes, Michelle N.; Gandhi, Maher K.
- PURPOSE Understanding the immunobiology of the 15% to 30% of patients with follicular lymphoma (FL) who experience progression of disease within 24 months (POD24) remains a priority. Solid tumors with low levels of intratumoral immune infiltration have inferior outcomes. It is unknown whether a similar relationship exists between POD24 in FL.; PATIENTS AND METHODS Digital gene expression using a custom code set-five immune effector, six immune checkpoint, one macrophage molecules-was applied to a discovery cohort of patients with early- and advanced-stage FL (n = 132). T-cell receptor repertoire analysis, flow cytometry, multispectral immunofluorescence, and next-generation sequencing were performed. The immune infiltration profile was validated in two independent cohorts of patients with advanced-stage FL requiring systemic treatment (n = 138, rituximab plus cyclophosphamide, vincristine, prednisone; n = 45, rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone), with the latter selected to permit comparison of patients experiencing a POD24 event with those having no progression at 5 years or more.; RESULTS Immune molecules showed distinct clustering, characterized by either high or low expression regardless of categorization as an immune effector, immune checkpoint, or macrophage molecule. Low programmed death-ligand 2 (PD-L2) was the most sensitive/specific marker to segregate patients with adverse outcomes; therefore, PD-L2 expression was chosen to distinguish immune infiltration(HI) (ie, high PD-L2) FL biopsies from immune infiltration(LO) (ie, low PD-L2) tumors. Immune infiltration(HI) tissues were highly infiltrated with macrophages and expanded populations of T-cell clones. Of note, the immune infiltration(LO) subset of patients with FL was enriched for POD24 events (odds ratio [OR], 4.32; c-statistic, 0.81; P = .001), validated in the independent cohorts (rituximab plus cyclophosphamide, vincristine, prednisone: OR, 2.95; c-statistic, 0.75; P = .011; and rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone: OR, 7.09; c-statistic, 0.88; P = .011). Mutations were equally proportioned across tissues, which indicated that degree of immune infiltration is capturing aspects of FL biology distinct from its mutational profile.; CONCLUSION Assessment of immune-infiltration by PD-L2 expression is a promising tool with which to help identify patients who are at risk for POD24. (C) 2019 by American Society of Clinical Oncology
- Journal of Clinical Oncology Journal
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