Remarkable Clinical Response of ALK-Rearranged/TP53-Mutant Lung Adenocarcinoma with Liver Metastasis to Atezolizumab-Bevacizumab-Carboplatin-Paclitaxel After ALK Inhibitors: A Case Report

Anaplastic lymphoma kinase-positive (ALK-positive) lung adenocarcinoma with multiple liver metastases accounts for a relatively small number of cases of non-small cell lung cancer. Several ALK-tyrosine kinase inhibitors (ALK-TKIs) are available for the treatment of lung cancer. However, there is limited evidence on the treatment of multiple liver metastases in patients with lung cancer that are refractory to ALK-TKIs. We report the case of a 42-year-old male patient with ALK-positive lung adenocarcinoma who experienced rapid progression to multiple liver metastases while receiving treatment with alectinib. Biopsy of the liver metastases revealed echinoderm microtubule-associated protein-like 4-ALK (EML4-ALK) fusion and tumor protein p53 (TP53) mutation; notably, ALK secondary mutations were not detected. Despite the sequential administration of third-generation ALK-TKIs, the liver metastases did not respond, the serum levels of total bilirubin and biliary enzymes continued to increase, and the patient’s general appearance worsened. Finally, the patient exhibited a remarkable clinical response to treatment with a combination of atezolizumab, bevacizumab, carboplatin, and paclitaxel (ABCP). ABCP is one of the optimal options for ALK-positive lung cancer with liver metastasis that is refractory to ALK-TKIs therapy.