Integrative analysis of spontaneous CLL regression highlights genetic and microenvironmental interdependency in CLL.

Abstract:

:Spontaneous regression is a recognized phenomenon in chronic lymphocytic leukemia (CLL) but its biological basis remains unknown. We undertook a detailed investigation of the biological and clinical features of 20 spontaneous CLL regression cases incorporating phenotypic, functional, transcriptomic, and genomic studies at sequential time points. All spontaneously regressed tumors were IGHV-mutated with no restricted IGHV usage or B-cell receptor (BCR) stereotypy. They exhibited shortened telomeres similar to nonregressing CLL, indicating prior proliferation. They also displayed low Ki-67, CD49d, cell-surface immunoglobulin M (IgM) expression and IgM-signaling response but high CXCR4 expression, indicating low proliferative activity associated with poor migration to proliferation centers, with these features becoming increasingly marked during regression. Spontaneously regressed CLL displayed a transcriptome profile characterized by downregulation of metabolic processes as well as MYC and its downstream targets compared with nonregressing CLL. Moreover, spontaneous regression was associated with reversal of T-cell exhaustion features including reduced programmed cell death 1 expression and increased T-cell proliferation. Interestingly, archetypal CLL genomic aberrations including HIST1H1B and TP53 mutations and del(13q14) were found in some spontaneously regressing tumors, but genetic composition remained stable during regression. Conversely, a single case of CLL relapse following spontaneous regression was associated with increased BCR signaling, CLL proliferation, and clonal evolution. These observations indicate that spontaneously regressing CLL appear to undergo a period of proliferation before entering a more quiescent state, and that a complex interaction between genomic alterations and the microenvironment determines disease course. Together, the findings provide novel insight into the biological processes underpinning spontaneous CLL regression, with implications for CLL treatment.

journal_name

Blood

journal_title

Blood

authors

Kwok M,Oldreive C,Rawstron AC,Goel A,Papatzikas G,Jones RE,Drennan S,Agathanggelou A,Sharma-Oates A,Evans P,Smith E,Dalal S,Mao J,Hollows R,Gordon N,Hamada M,Davies NJ,Parry H,Beggs AD,Munir T,Moreton P,Paneesha

doi

10.1182/blood.2019001262

subject

Has Abstract

pub_date

2020-02-06 00:00:00

pages

411-428

issue

6

eissn

0006-4971

issn

1528-0020

pii

429232

journal_volume

135

pub_type

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