A randomized and double-blind clinical trial of the analgesic effect of controlledrelease morphine sulphate(MS contin tablets.CRMS)against moderate and severe intensity of pain in cancer patients was carried out in several hospitals.

• 应用硫酸吗啡控释片（CRMS）对晚期癌症伴有中、重度疼痛患者进行镇痛效果观察。