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Signatures of plasticity, metastasis, and immunosuppression in an atlas of human small cell lung cancer (SCLC tumor cells)

Joseph M. Chan, Álvaro Quintanal-Villalonga, Vianne Ran Gao, Yubin Xie, Viola Allaj, Ojasvi Chaudhary, Ignas Masilionis, Jacklynn Egger, Andrew Chow, Thomas Walle, Marissa Mattar, Dig V.K. Yarlagadda, James L. Wang, Fathema Uddin, Michael Offin, Metamia Ciampricotti, Besnik Qeriqi, Amber Bahr, Elisa de Stanchina, Umesh K. Bhanot, W. Victoria Lai, Matthew J. Bott, David R. Jones, Arvin Ruiz, Marina K. Baine, Yanyun Li, Natasha Rekhtman, John T. Poirier, Tal Nawy, Triparna Sen, Linas Mazutis, Travis J. Hollmann, Dana Pe'er, Charles M. Rudin

Small cell lung cancer (SCLC) is an aggressive malignancy that includes subtypes defined by differential expression of ASCL1, NEUROD1, and POU2F3 (SCLC-A, -N, and -P, respectively). To define the heterogeneity of tumors and their associated microenvironments across subtypes, we sequenced 155,098 transcriptomes from 21 human biospecimens, including 54,523 SCLC transcriptomes. We observe greater tumor diversity in SCLC than lung adenocarcinoma, driven by canonical, intermediate, and admixed subtypes. We discover a PLCG2-high SCLC phenotype with stem-like, pro-metastatic features that recurs across subtypes and predicts worse overall survival. SCLC exhibits greater immune sequestration and less immune infiltration than lung adenocarcinoma, and SCLC-N shows less immune infiltrate and greater T cell dysfunction than SCLC-A. We identify a profibrotic, immunosuppressive monocyte/macrophage population in SCLC tumors that is particularly associated with the recurrent, PLCG2-high subpopulation.

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Species: human
Number of cells: 54313
Number of downloads: 5
Study size: 2GB
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Immunology 
immuno-oncology 
Human Cell Atlas 
lung adenocarcinoma 
Cancer 
Small cell lung cancer 
Non-small cell lung cancer