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// LDi LDi= 当前病灶的长径
// LDi LDi= 当前病灶的短径
// PPD PPD= 当前病灶的PPD
if( 15mm < 当前靶病灶LDi && 相比最低点PPD增加百分比 ≥50％ )
{
// 疾病进展
}