The initial case was a man in his 50s. He received 2 cans a day of ProSure^®, while undergoing radiation and chemotherapy with carboplatin and docetaxel for adenocarcinoma in the lung. His body weight rose from 62.4 kg on admission to 63.7 kg before discharge, CRP decreased from 3.08 mg/dl to 0.48 mg/dl, and albumin fell from 3.6 g/dl to 3.5 g/dl. The second case was a man in his 60s. He was diagnosed as having squamous cell carcinoma in the lung and administered with 2 cans a day of ProSure^® and antibiotics. One-and-a-half months later, he underwent chemotherapy with carboplatin and S-1 and radiation. His body weight stood at 47.0 kg on admission and 47.2 kg before discharge, CRP dropped from 15.45 mg/dl to 3.26 mg/dl, and albumin was retained at 2.6 g/dl to 2.7g/dl. The administration of ProSure^® brought about improvements in the nutritional status and anti-inflammatory effects in the patients with chemotherapy.