[Light-chain escape from plateau phase].

Area of Science:

• Hematology
• Oncology
• Clinical Medicine

Background:

• Multiple myeloma is a plasma cell malignancy characterized by a plateau phase of stable disease.
• Light-chain escape is a rare phenomenon where only the involved immunoglobulin light chains increase, despite stable disease.
• Novel therapeutic agents have significantly altered the treatment landscape of multiple myeloma.

Observation:

• This report details the first documented case of light-chain escape occurring after a 7-year plateau phase in multiple myeloma.
• The patient had not received any novel therapeutic agents during the course of their disease.
• The clinical presentation and laboratory findings leading to the identification of light-chain escape are described.

Findings:

• Light-chain escape was identified after 7 years of stable disease in a patient with multiple myeloma.
• The patient had no prior exposure to novel agents, highlighting a unique clinical scenario.
• A very good partial response was achieved following the diagnosis of light-chain escape.

Implications:

• This case expands the understanding of the diverse clinical trajectories in multiple myeloma.
• It underscores the importance of monitoring for rare complications like light-chain escape, even after prolonged stable disease.
• The findings suggest potential therapeutic strategies for light-chain escape in the context of novel agent-naïve patients.