Primary light chain-associated amyloidosis (AL) is a plasma cell dyscrasia
that causes morbidity via systemic tissue deposition of monoclonal light ch
ains in the form of fibrils (amyloid). It is the most common form of system
ic amyloidosis in Western countries and is rapidly fatal. Knowledge of the
pathobiology of the underlying B cell clone is of primary importance for th
e design and optimization of therapeutic strategies.