Analysis of lung adenocarcinoma with bone metastasis: a case report.

Lung adenocarcinoma is one of the most common types of lung cancer, and patients with epidermal growth factor receptor (EGFR) mutation-positive can be intervened with EGFR-TKI therapy to achieve longer survival. AURA3 study showed that patients resistant with the first generation of EGFR-TKI and with T790M mutation still received longer progression-free survival (PFS) after treatment with the third generation of EGFR-TKI osimertinib, and osimertinib also had a good effect on brain metastasis. Moreover, the FLAURA study published by the European Society of Medical Oncology (ESMO) in 2019 showed that the first line use of osimertinib could achieve a PFS of 18.9 months. In recent years, researches on lung cancer seem like blooming flowers. The new treatment mode for lung cancer treatment such as anti-angiogenic drugs, immunotherapy programs has satisfactory efficacy either alone or in combination. Notably, patients with lung adenocarcinoma often have single or multiple bone metastasis, which brings great suffering to patients, especially when metastases occurred in the weight-bearing bone. However, there is no solid evidence to prove that chemotherapy, targeted therapy, anti-angiogenic drugs, or immunotherapy have long-term efficacy in bone metastasis of lung adenocarcinoma. The present strategies for bone metastasis of lung cancer include of: palliative care, analgesia, improvement of bone metabolism, local radiotherapy, and radionuclide therapy. However, by far, no medical treatment has a significant advantage in inhibiting the course of bone metastasis in lung cancer at the source. In this case, patient with advanced lung adenocarcinoma and EGFR mutation was resistant with the first generation of EGFR-TKI treatment, and after detection of T790M mutation, we switched to osimertinib for primary disease control, bone metastasis was still obvious, and there was still no obvious effect after pain relief, bone metabolism improvement and local radiotherapy. This case is reported to suggest that further efforts in anti-tumor and palliative treatment in bone metastasis of lung adenocarcinoma are urgently needed.