患者女，57岁。因“咳嗽、胸闷半月余，加重2天”入院。胸部CT示:右上肺叶外周带占位性病变，纵隔淋巴结肿大、增多，右侧中等量胸腔积液。胸水细胞学可见腺癌细胞。头颅MRI、腹部B超、骨ECT均未发现异常。若患者PS评分为1，那么首选的治疗方式应当为

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