Treatment patterns and health care resource utilization among patients with relapsed/refractory systemic light chain amyloidosis.

BACKGROUND: Treatment for patients with systemic light chain (AL) amyloidosis remains challenging. Our study aims to describe treatment patterns for both newly diagnosed and relapsed/refractory AL (RRAL) amyloidosis, and to assess clinical outcomes, healthcare costs, and resource utilization during the first year following a diagnosis of RRAL amyloidsis. METHODS: This was a retrospective observational study of adult patients with AL amyloidosis using the US Optum administrative claims data during 1/1/2008 to 6/30/2015. Diagnosis was based on both ICD-9 codes and treatments with a claim for AL-amyloidosis-specific anticancer systemic agents. RESULTS: Of 334 patients with AL amyloidosis, 43.1% were considered as RRAL amyloidosis. The majority (75%) of RRAL amyloidosis patients had organ involvement prior to the second line treatment. Proteasome-inhibitor-based regimens were most frequently used (41.0% for first-line AL, 30.6% for RRAL amyloidosis). Organ deterioration and mortality rates were 49.3% and 10.4%, respectively, during the two years following relapse. The average monthly cost was $14,369 per patient for RRAL amyloidosis including medical costs ($9441) and drug costs ($4928). CONCLUSIONS: RRAL amyloidosis is associated with high morbidity from target organ failure and mortality, which emphasizes the need for novel medications to improve care for patients with RRAL amyloidosis.