Advertisement

Presentation and outcome with second line treatment in AL amyloidosis previously sensitive to non-transplant therapies

Giovanni Palladini, Paolo Milani, Andrea Foli, Marco Basset, Francesca Russo, Stefano Perlini and Giampaolo Merlini

Key points

  • Exposure to melphalan and bortezomib and quality of response to upfront treatment prolong time to second-line therapy in AL amyloidosis.

  • Patients who need second-line therapy after initial response have a good outcome if they are rescued before cardiac progression.

Abstract

The management of light chain (AL) amyloidosis has improved in recent years thanks to accurate biomarker-based staging systems and response criteria and availability of novel effective therapies. However, previous studies have focused on newly diagnosed patients, and little is known on relapsed patients, despite trials of new agents are often performed in this setting. In the present study we report the outcome of 259 patients who responded to upfront therapy. Ninety-two patients (35%) needed second-line therapy after a median of 49 months. Cardiac and renal progression were observed in 22% and 12% of patients who received second-line therapy, respectively. Complete response after upfront treatment and frontline therapy with combined bortezomib, melphalan and dexamethasone independently prolonged time to second-line therapy. Median survival of relapsing patients was 59 months. Patients who had a "high-risk dFLC progression," which we defined as a difference between involved and uninvolved FLC (dFLC) of >20 mg/L, a level >20% of baseline value, and a >50% increase from the value reached at best response, had a shorter survival after initiation of second-line therapy on univariate, but not on multivariate analysis, where cardiac progression was the only independent predictor of survival after starting rescue treatment. Patients with AL amyloidosis who need second-line therapy after response to upfront treatment generally have a good outcome. A "high-risk dFLC progression" should trigger rescue treatment while cardiac progression should not be awaited.

  • Submitted April 20, 2017.
  • Accepted November 1, 2017.