[Gastric metastasis of breast cancer treated as primary gastric cancer due to difficulty in differentiating primary and metastatic cancer:a case report]. - Nukui T; Minowa A; Mizushima T; Urakabe K; Okayama K; Suzuki T; Suzuki Y; Haneda K; Takahashi S; Okumura F (Nihon Shokakibyo Gakkai zasshi = The Japanese journal of gastro-enterology, 2024)