Invasive non-small cell lung cancer with necrosis can be treated by various methods such as surgery, chemotherapy and radiotherapy, and the specific treatment plan is related to the tumor stage. 1. Surgery: patients with invasive non-small cell lung cancer with necrosis can be treated by surgical resection of the diseased area, which can help reduce the spread of cancer cells and remove the necrotic area to prevent affecting the surrounding tissues. 2. Chemotherapy: if the vital organs of patients with invasive non-small cell lung cancer with necrosis can tolerate it, they can be treated by chemotherapy, and commonly used drugs include cisplatin, gemcitabine and paclitaxel, which can help kill cancer cells and stabilize the condition. 3. Radiotherapy: Patients with invasive non-small cell lung cancer with mortality can be treated with radiotherapy, which commonly includes radical radiotherapy, palliative radiotherapy and adjuvant radiotherapy, etc., which can kill cancer cells without affecting the surrounding tissues. As the specific treatment plans are different for different stages, patients should adopt appropriate treatment methods under the guidance of doctors.