Plasma exchange for treatment of a therapy-related thrombotic microangiopathy in a patient with advanced hepatocellular carcinoma-A case report.

Key Clinical Message: Thrombotic microangiopathies are a side effect of anti-VEGF therapies, which are often limited to the kidneys but can also occur systemically and be life-threatening. Screening for increasing proteinuria is essential. Abstract: We present the case of a 65-year-old male patient with a multifocal HCC, Barcelona clinic liver cancer (BCLC) classification B at the time of diagnosis. The HCC was treated with nine sessions of transarterial chemoembolization (TACE), and after a progress, the therapy was switched to a combination of atezolizumab and bevacizumab. Five months after therapy change, he presented with an acute kidney injury. The histopathology of the renal biopsy showed findings of a thrombotic microangiopathy (TMA), which we treated with 12 sessions of therapeutic plasma exchange in combination with steroids, resulting in a decreased TMA activity and later in a remission of the TMA. This case suggests the importance of monitoring the kidney function and proteinuria in patients under anti-vascular endothelial growth factor (VEGF) therapy and shows a rare differential diagnosis for a worsening of kidney function in these patients. Furthermore, it shows that therapeutic plasma exchange might be a valuable therapeutic option for patients with TMA due to anti-VEGF therapy.