乳房癌是皮肌炎最常伴发的肿瘤,只有20%的病例肿瘤出现在皮损之前.一般当肿瘤经治疗得到控制时皮肌炎亦得到改善,尚无经治疗肿瘤在消退时开始发生皮肌炎的报道.本文报告3例癌肿患者经它莫西芬(tamoxifen)治疗肿瘤全部或部分消退,而在肿瘤消退的3个月内发生了皮肌炎或多发性肌炎.例1:50岁妇女,1972年行左乳房切除术,1976年9月右锁骨上窝出现一肿 Breast cancer is the most common tumor of dermatomyositis, and only 20% of the cases of the tumor appear before the lesion.General dermatomyositis is generally improved when the tumor is controlled and no untreated tumor begins to develop Dermatomyositis reported in this paper reported three cases of cancer patients treated with tamoxifen all or part of the tumor subsided, and within 3 months of tumor regression dermatomyositis or polymyositis occurred. : 50-year-old woman, left mastectomy 1972, 1976 September a right swollen supraclavicular fossa