拉米呋定预防化疗中乙型肝炎活动的临床分析

目的:分析研究合并乙型肝炎病毒(HBV)感染的肿瘤患者预防应用拉米呋定是否减少化疗中乙型肝炎病毒再活化。方法:回顾性分析本科2000年2月～2005年8月收治的39例合并HBV感染的需化疗的乳腺癌、非小细胞肺癌、非霍杰金淋巴瘤(NHL)和骨肉瘤患者的治疗方法,按是否从化疗前1周开始口服拉米呋定分为:治疗组18例,对照组21例。前者口服拉米呋定,至化疗后6个月。比较化疗后肝功能损害、急性肝炎、HBV再活化和化疗延迟等指标的变化。结果:两组比较,治疗组肝功能损害发生率无显著性差异(55.6%vs.42.9%,P=0.429),急性肝炎发生率明显下降(11.1%vs.57.1%,P=0.006),HBV再活化发生率下降(5.6%vs.38.1%,P=0.023),而化疗延迟发生率下降(16.7%vs.61.9%,P=0.008)。结论:预防性口服拉米呋定可能可以有效抑制HBV复制和肝炎活动,值得进一步研究。     

自体外周血干细胞移植治疗恶性血液病

 目的 观察自体外周血干细胞移植（APBSCT）治疗急性白血病及恶性淋巴瘤的疗效。方法 用APBSCT治疗急性白血病3例,恶性淋巴瘤5例,恶性淋巴瘤采用环磷酰胺联合粒细胞集落刺激因子（G-CSF）动员;3例白血病患者化疗缓解后,予5～9个疗程的化疗巩固治疗,再给予化疗加G-CSF动员。5例恶性淋巴瘤预处理方案为CBV,急性白血病预处理方案为MAC。结果 全部患者均获得完全缓解,随访时间4～12个月,全部病例无病生存,无移植相关死亡。结论 APBSCT是治疗急性白血病及恶性淋巴瘤、改善其预后的主要手段之一,APBSCT后对急性白血病患者应定期进行序贯化疗和免疫治疗,对难治的恶性淋巴瘤患者应进行补救治疗及免疫治疗。     

HBsAg(-)伴HBcAb(+)淋巴瘤患者免疫化疗后肝炎病毒再激活临床观察

乙肝病毒(hepatitis B virus,HBV)再激活是慢性乙型肝炎患者接受化疗后的一种严重并发症,在非霍奇金淋巴瘤患者的发生率较高[1],化疗前预防性应用抗病毒药物在临床上已达成共识.近年来,国外一些研究显示,某些乙型肝炎表面抗原阴性伴核心抗体阳性即HBsAg(-)/HBcAb(+)的淋巴瘤患者,在应用了含利妥昔单抗的免疫化疗后,也发生了HBV再激活.但不同研究之间所报道的发生率差异较大,为2.2%～23.8%[2-4],是否需要常规抗病毒预防治疗目前也存在争议.本研究旨在明确HBsAg(-)/HBcAb(+)患者在接受含利妥昔单抗的免疫化疗后,出现乙肝再激活的发生率,探索危险因素,为治疗提供依据.     

自体造血干细胞移植及嵌合抗原受体T细胞治疗复发难治大B细胞淋巴瘤研究进展

大B细胞淋巴瘤(LBCL)是国内最常见的淋巴瘤亚型, 虽然免疫化疗模式的应用显著提高了治愈率, 但仍有40%～50%患者会出现难治或复发。传统的挽救化疗序贯自体造血干细胞移植(AHCT)可使约40%的化疗敏感复发难治LBCL患者获得治愈, 但约50%的复发难治LBCL患者因对挽救性免疫化疗抵抗而无法行AHCT。嵌合抗原受体T细胞(CAR-T)免疫疗法目前备受关注, 已有两种CD19 CAR-T在国内被批准用于复发难治LBCL的治疗。文章结合第63届美国血液学会年会报道对AHCT与CAR-T治疗复发难治LBCL的最新进展进行总结。     

免疫检查点抑制剂联合化疗治疗难治性高级别B细胞淋巴瘤非特指型1例及文献复习

目的:回顾性分析1例难治性高级别B细胞淋巴瘤非特指型老年患者应用免疫检查点抑制剂联合化疗的疗效。方法:分析该病例的治疗经过，探讨选择免疫检查点抑制剂联合化疗对难治性高级别B细胞淋巴瘤的作用，并结合相关文献资料进行复习。结果:该例高级别B细胞淋巴瘤非特指型老年患者经过多程化疗后进展，因基础疾病、合并症及化疗耐受性等因素导致后续化疗方案选择受限且疗效欠佳，我们通过联合免疫检查点抑制剂及化疗药物治疗后患者病灶完全消退获得完全缓解，未出现明显毒副反应，无疾病进展时间达半年以上。结论:免疫检查点抑制剂联合化疗是治疗难治性高级别B细胞淋巴瘤有效选择之一。     

乙型肝炎病毒表面抗原阴性伴核心抗体阳性非霍奇金淋巴瘤患者免疫化疗后肝炎病毒再激活的临床分析

目的探讨乙型肝炎病毒(HBV)表面抗原(HBs Ag)阴性(-)伴核心抗体(Hbc Ab)阳性(+)非霍奇金淋巴瘤患者免疫化疗后肝炎病毒再激活的临床意义。方法选择2005年1月至2012年1月间就诊并接受2个以上疗程免疫化疗的HBs Ag(-)伴HBc Ab(+)非霍奇金淋巴瘤患者105例为研究对象,对其予以含利妥昔单抗的免疫化疗,观察免疫化疗后HBV再激活的发生情况。结果 105例HBs Ag(-)伴HBc Ab(+)非霍奇金淋巴瘤患者中,HBV表面抗体(HBs Ab)(+)者67例,占63.8%。105例患者中,肝功能损害Ⅰ~Ⅲ度者13例,其中1例患者出现了HBV再激活(1.0%),12例证实与HBV再激活引起肝损害无关。1例出现了HBV再激活患者为男性、50岁,病理组织学提示为非霍奇金氏淋巴瘤,弥漫大B细胞性,在4次化疗后10 d发生HBV再激活,经治疗后病情好转。结论 HBs Ag(-)伴HBc Ab(+)淋巴瘤患者免疫化疗后肝炎病毒再激活的临床发生率相对较小,目前对该类患者仍以常规HBV DNA检查、肝功能监测为主,以便更早的发现HBV携带者及感染者。     

乳腺癌术后转移放化疗后乙肝病毒再激活致死1例报告并文献复习

背景乙型肝炎病毒的再激活是乙肝表面抗原阳性患者化疗的一个并发症。其临床可表现为无症状肝炎,也可表现为致死性肝功能衰竭。即使乙型肝炎病毒的再激活使肿瘤治疗的预后变差,由于其它肝损害可能的原因,其往往被忽略。病例报告此病例为乳腺癌术后转移患者,在行2个周期多西他赛和吉西他滨联合化疗,肝脏转移灶放疗后,出现了急性肝功能衰竭。与之相鉴别的诊断为化疗诱发的肝衰竭、自身免疫性肝炎、放疗诱发的肝衰竭和肝转移灶的浸润。结论此病例提醒临床医生,患者在接受化疗和免疫抑制疗法治疗时,应检测乙肝血清学标志物HBsAg、HBcAb、HBeAg和HBV,DNA,对阳性的患者应接受拉米夫定或有效对抗乙型肝炎病毒其它药物的预防性治疗。     

非免疫抑制相关的脑原发淋巴瘤19例诊治分析

目的:分析免疫功能正常患者脑原发淋巴瘤的临床特点、治疗和预后情况,并结合文献复习探讨其合理的治疗方式.方法:回顾性分析天津医科大学附属肿瘤医院2000年1月至2009年6月收治的19例无免疫抑制患者脑原发淋巴瘤的临床特征、治疗方式及预后因素,运用SPSS 16.0软件包进行统计分析.结果:19例患者中,男7例,女12例,中位年龄55岁.全组1、3、5年累积生存率分别为78.0%、39.7%和13.2%,中位生存期(MST)22个月;单病灶12例,多病灶7例.病理检查为B细胞来源者占94.7%(18/19),病理类型以弥漫性大细胞淋巴瘤为主.16例患者接受了手术治疗.全组共2例行大剂量甲氨蝶呤化疗.经Log-rank检验:病灶的单发或多发对生存率有显著影响(P=0.001).结论:近年免疫功能正常人群脑原发淋巴瘤发病率上升,疗效不理想,多病灶患者预后不良.化疗在其综合治疗中极为重要,临床采用以HD-MTX为基础的化疗+放疗策略,可提高脑原发淋巴瘤患者的总体生存期.     

HBsAg阴性HBcAb阳性肿瘤患者化疗后HBV再激活3例报道并文献复习

目的：探讨乙肝表面抗原（HBsAg）（-）核心抗体（HBcAb）（+）肿瘤患者化疗后引起乙型肝炎病毒（HBV）再激活的治疗与监控。方法：报道3例HBsAg（-）HBsAg（+）的肿瘤患者化疗过程中出现HBV再激活的病例,针对可行的治疗监控措施进行文献复习。结果：1例最初乙肝表面抗体（HBsAb）（+）、HBcAb（+）的非霍奇金淋巴瘤（NHL）患者经过多次化疗后转变为HBsAg（+）、e抗原（HBeAg）(+)、HBcAb（+）;1例乙肝e抗体（HBsAb）（+）、HBcAb(+)的霍奇金淋巴瘤（NL）患者化疗后乙肝模式未改变,乙肝病毒载量（HBV-NDA）定量结果增高;1例HBsAb(+)、HBeAb(+)、HBcAb(+)的肝癌患者性肝动脉化疗栓塞术（TACE）后出现HBV-DNA定量结果增高。3例HBsAg(-)患者化疗后均出现HBV再激活,经抗病毒治疗后获得良好转归。结论：不仅对于HBsAg（+）的患者,对于即使处于康复期的既往有急性或慢性乙肝病史的HBsAg(-)、HBcAb（+）患者,在应用化疗或免疫抑制剂治疗时均需严密监测血清HBsAg、肝功能及HBV-DNA定量的动态变化,必要时实施预防性抗病毒治疗,以免中止原有治疗计划延误病情。     

拉米夫定预防鼻咽癌合并HBV阳性患者化疗中肝功能损害

目的:探讨拉米夫定在预防鼻咽癌合并HBV阳性患者化疗中肝功能损害的作用。方法:84例经病理或细胞学证实,且经过HBV血清学检测确诊为HBsAg阳性的鼻咽癌患者分为研究组（43例）与对照组（41例）。研究组化疗前预防性使用抗病毒药物拉米夫定,同期观察40例未患乙肝的患者。治疗后比较各组患者肝功能损害的情况以及对化疗的影响。结果:各组患者化疗后肝功能损害发生率分别为18.6%、39.0%、15.0%,差异有统计学意义。而且HBV发生再激活后DNA载量水平与肝功能损害程度之间高度相关。结论:HBsAg阳性的鼻咽癌患者化疗后较 HBsAg阴性患者更容易出现肝功能损害,预防性使用抗病毒药物拉米夫定可明显降低HBV再激活肝炎的发生。     

乙肝肝硬化患者抗病毒治疗后肝癌发生的危险因素分析

目的:探讨乙肝肝硬化患者抗病毒治疗后仍然进展为肝细胞肝癌的危险因素。方法:纳入2014年7月至2017年7月我院收治的72例乙肝肝硬化患者的临床资料。根据乙肝肝硬化患者抗病毒治疗满1年后是否进展为肝细胞肝癌分为肝癌组(21例)和肝硬化组(51例)。收集两组患者临床资料,采用统计软件SPSS 21.0进行数据分析,将两组间差异有统计学意义的指标作为自变量,对自变量行Logistic单因素和多因素回归分析,探究乙肝肝硬化患者进展为肝细胞肝癌的独立危险因素。结果:对比两组患者的临床资料,发现性别、年龄、家族史、糖尿病史、谷草转氨酶(AST)及抗病毒治疗12周病毒学应答指标有差异,且差异具有统计学意义(P＜0.05);对自变量行Logistic单因素和多因素回归分析,结果发现男性、年龄≥48岁和抗病毒治疗前AST≥40 U/L是乙肝肝硬化患者经抗病毒治疗后进展为肝细胞肝癌的独立危险因素(P＜0.05)。结论:男性、年龄大(≥48岁)和抗病毒治疗前AST≥40 U/L是乙肝肝硬化患者经抗病毒治疗后进展为肝细胞肝癌的独立危险因素。     

术前抗病毒治疗对HBV-DNA 阴性肝细胞癌患者术后病毒再激活及肝功能的影响*

目的:评估术前抗病毒治疗对术后乙肝病毒再激活以及肝功能的影响。方法:2012年7 月至2016年3 月将广西医科大学附属肿瘤医院肝胆胰脾外科乙肝病毒DNA 阴性的HCC 患者分成抗病毒组（66例）及对照组（108 例）,抗病毒组术前给予恩替卡韦分散片抗病毒治疗,对照组未给予抗病毒治疗。统计分析术后HBV 再激活及肝功能指标变化情况。结果:抗病毒组HBV 激活率为3%（2/ 66）,对照组为27.8%（30/ 108）。 多因素分析显示小部分肝切术（HR= 4.695;95%CI:1.257- 17.537,P = 0.021）及术前未抗病毒治疗（HR= 8.164;95%CI:1.831- 36.397,P = 0.006）是术后HBV 再激活的危险因素。抗病毒组与未抗病毒组,激活组与未激活组术后7 天内肝功能指标差异无统计学意义（P > 0.05）,术后30天比较,ALT 及ALB 差异有统计学意义（P < 0.05）。 结论:对于DNA阴性的HCC 患者,肝切除术可导致HBV 再激活,术前抗病毒治疗能有效降低HBV 再激活风险及保护肝功能。      

Association of HBV DNA replication with antiviral treatment outcomes in the patients with early-stage HBV-related hepatocellular carcinoma undergoing curative resection

Background: It remains unclear what the antiviral therapy affects disease?free survival (DFS) and overall survival (OS) of patients with hepatitis B virus (HBV)?related hepatocellular carcinoma (HCC) at different tumor stages and baseline HBV DNA levels. In this study, we analyzed the association of antiviral treatment with DFS and OS based on the stratifi?cation of baseline HBV DNA load in early?stage (stages I and II) HCC patients. Methods: We included 445 patients with early?stage HBV?related HCC who underwent curative resection, and then classified them into four subgroups based on baseline HBV DNA load and antiviral therapy stratification. The Kaplan–Meier and Cox regression analyses were performed to determine the association of clinical characteristics with survival. Results: The median follow?up period was 74 months. For all patients, cumulative OS rates in the antiviral group were significantly higher than those in the non?antiviral group (log?rank test, P = 0.023), whereas no significant differencesin DFS rates were observed. High baseline HBV DNA level was a risk factor associated with short DFS and OS in all patients. In patients with baseline HBV DNA levels ≥2000 IU/mL, antiviral treatment was significantly associated withprolonged DFS and OS (log?rank test, P or undetectable, antiviral treatment did not show a significant benefit in prolonging DFS and OS. Conclusions: High baseline HBV DNA levels are associated with poor prognosis in the patients with early?stage HCC, and the antiviral treatment could generate survival benefits for the patients. Therefore, antiviral treatment should be given for these patients. However, the effect of antiviral treatment on the patients with low viral load remains unclear, and further investigation is warranted.     

核苷(酸)类药物治疗CHB患者发生HCC的危险因素Logistic回归分析

目的 探讨核苷(酸)类药物治疗慢性乙型肝炎(CHB)患者发生原发性肝癌(HCC)的危险因素,为HCC防治提供参考.方法 收集采用核苷(酸)类药物(NA)治疗的278例CHB患者临床资料,专人对患者资料进行回顾性的调查整理,对可能影响HCC发生的危险因素进行分析.结果 278例患者中31例患者发生HCC,HCC发生率为1...     

Treatment of high-risk neuroblastoma with triple-tandem high-dose therapy and stem-cell rescue: results of the Chicago Pilot II Study.

PURPOSE: To investigate whether intensive induction therapy followed by triple-tandem cycles of high-dose therapy with peripheral-blood stem-cell rescue and local irradiation will improve event-free survival for patients with high-risk neuroblastoma. PATIENTS AND METHODS: From August 1995 to January 2000, 25 consecutive newly diagnosed high-risk neuroblastoma patients and one child with recurrent MYCN-amplified disease were enrolled onto the Chicago Pilot II Protocol. After induction therapy and surgery, peripheral-blood stem cells were mobilized with three cycles of high-dose cyclophosphamide and granulocyte colony-stimulating factor. Patients then underwent triple-tandem cycles of high-dose therapy with peripheral-blood stem-cell rescue followed by radiation to the primary site. RESULTS: Twenty-two of the 26 patients successfully completed induction therapy and were eligible for the triple-tandem consolidation high-dose therapy. Sufficient numbers of peripheral-blood stem cells were collected in all but one patient. Seventeen patients were able to complete all three cycles of high-dose therapy and peripheral-blood stem-cell rescue, two patients completed two cycles, and three patients completed one cycle. There was one toxic death, and one patient died from complications of treatment for graft failure. With a median follow-up of 38 months, the 3-year event-free survival and survival rates are 57% +/- 11% and 79% +/- 10%, respectively. CONCLUSION: The results of this pilot study demonstrate that it is feasible to intensify consolidation with triple-tandem high-dose chemotherapy and peripheral-blood stem-cell rescue and local irradiation, and suggest that this treatment strategy may lead to improved survival for patients with high-risk neuroblastoma.     

Comparison of an aprepitant regimen with a multiple-day ondansetron regimen, both with dexamethasone, for antiemetic efficacy in high-dose cisplatin treatment.

BACKGROUND: We compared an aprepitant regimen with a control regimen of ondansetron + dexamethasone given for 4 days. PATIENTS AND METHODS: Patients scheduled to receive cisplatin > or =70 mg/m(2) were randomized to either the aprepitant regimen (aprepitant, ondansetron and dexamethasone on day 1; aprepitant and dexamethasone on days 2-3; dexamethasone on day 4) or control regimen (ondansetron + dexamethasone on days 1-4). Patients recorded vomiting, nausea and rescue therapy use. The primary end point was complete response (no vomiting and no use of rescue therapy) in the overall phase (days 1-5 post-cisplatin). RESULTS: Complete response rates were higher in the aprepitant than control group in the overall (72% versus 61%; P = 0.003), acute (day 1; 88% versus 79%; P = 0.005) and delayed phases (days 2-5; 74% versus 63%; P = 0.004), as were rates of no vomiting (overall 77% versus 62%, P < or = 0.001; acute 89% versus 81%, P = 0.004; delayed 79% versus 64%, P < or = 0.001). Rates of no rescue therapy were similar between groups. CONCLUSIONS: Compared with an antiemetic regimen in which ondansetron + dexamethasone were given for 4 days, the aprepitant regimen was superior in the acute, delayed and overall phases of chemotherapy-induced nausea and vomiting. The aprepitant regimen should be considered a new standard of antiemetic therapy for cisplatin-treated patients. www.ClinicalTrials.gov Identifier: NTC00090207.     

Risk factors of ototoxicity after cisplatin-based chemo-irradiation in patients with locally advanced head-and-neck cancer: a multivariate analysis

PURPOSE: Cisplatin chemo-irradiation is increasingly used in locally advanced squamous cell carcinoma of the head and neck. The objective of this study is to determine risk factors of ototoxicity due to intra-arterial high-dose cisplatin chemoradiation. METHODS AND MATERIALS: A prospective analysis of hearing thresholds at low and (ultra) high frequencies obtained before, during, and after treatment in 146 patients. Treatment consisted of intra-arterial infusion of high-dose cisplatin (150 mg/m(2), four courses) with sodium thiosulfate rescue and concurrent radiation therapy (70 Gy). Patient and chemoradiation variables were studied in a multivariate analysis. RESULTS: After treatment, 23% of the ears were under consideration for hearing aids because of therapy. Twenty-two percent of the patients developed an increase in air-bone gap >10 dB during or after therapy. In the multivariate explanatory analysis, cumulative dose of cisplatin and radiation therapy, and young age displayed a causal relationship with increased sensorineural hearing loss during and after therapy (p < 0.001). In the multivariate prediction analysis, pretreatment hearing level of the concerning ear was identified as an independent predictive factor for hearing capability after therapy (p < 0.0001). CONCLUSIONS: Both cisplatin and radiation therapy were proven to induce sensorineural hearing loss, in this study with short-term follow-up. Of all patient and treatment variables studied, the patients pretreatment hearing level appeared to be the main predictive factor for hearing capability after high-dose intra-arterial cisplatin chemoradiation.     

长、短疗程口服抗病毒药预防急性髓系白血病患者乙型肝炎病毒再激活的观察研究

背景与目的：乙型肝炎病毒(hepatitis B virus,HBV)再激活是急性髓系白血病(acute myeloid leukemia,AML)合并HBV感染的患者接受诱导和巩固化疗期间严重并发症之一,核苷类抗HBV药物(包括拉米夫定和恩替卡韦等)已成为预防和抢先治疗HBV再激活主要抗病毒药物。该研究观察并探究AML合并HBV感染患者化疗前后长疗程和短疗程口服核苷类抗HBV药物预防病毒再激活的临床疗效和安全性。方法：回顾性分析29例AML合并HBV感染并接受至少4个疗程化疗患者的临床资料。根据患者口服核苷类抗HBV药物预防治疗前HBV表面抗原(hepatitis B surface antigen,HBsAg)含量以及抗HBV药物持续服用时间分为4个亚组,系统分析和比较不同亚组患者HBV再激活情况和药物不良反应。结果：长疗程预防(long course prophylaxis group,LCP)组,即口服抗HBV药物持续至化疗结束后6个月以上,该组患者的HBV再激活率和HBV相关性肝炎发生率分别为5.56%(1/18)和0%(0/18),明显低于短疗程预防(short course prophylaxis group,SCP)组患者(即口服抗HBV药物持续至化疗结束后1个月以内)的45.45%(5/11)和36.36%(4/11),差异有统计学意义(P=0.018和P=0.014),而LCP和SCP组患者的HBV原发耐药率分别为11.11%(2/18)和9.09%(1/11),差异无统计学意义(P>0.05)。进一步亚组分析显示,预防治疗前HBsAg阳性患者(HBsAg大于等于0.05 IU/mL)经长疗程预防,其HBV再激活率和HBV相关性肝炎发生率分别为8.33%(1/12)和0%(0/12),明显低于SCP组,66.67%(4/6)和66.67%(4/6),差异有统计学意义(P=0.022和P=0.005);同时,LCP和SCP组中HBsAg(+)患者的HBV原发耐药率分别为8.33%(1/12)和16.67%(1/6),差异无统计学意义(P>0.05)。此外,LCP组中HBsAg阴性患者(HBsAg小于0.05 IU/mL)的HBV再激活率、肝炎发生率和原发耐药率与SCP组中HBsAg(-)患者比较,差异无统计学意义(P>0.05)。LCP和SCP组患者均未发生3级以上药物毒性反应。结论：长疗程口服核苷类抗HBV药物是降低AML合并HBsAg(+)感染患者化疗后病毒再激活以及病毒相关事件发生率有效而且安全性良好的预防治疗方案。     

根治切除术联合抗病毒治疗肝癌合并乙肝病毒感染的临床研究

目的:探讨根治切除术联合抗病毒治疗肝癌合并乙肝病毒（HBV）感染的临床效果。方法:选取2010年4月-2013年4月100例肝癌合并乙肝病毒感染患者为研究对象,按照HBV-DNA水平不同分成高病毒复制组和低病毒复制组（以HBV-DNA载量为105拷贝/ml为标准）,比较四组在肝功能、HBV-DNA水平、生存时间、肿瘤复发率和住院时间、住院费用方面的差异性。结果:抗病毒治疗后无论在高病毒复制组和低病毒复制组中,肝功能明显好转,HBV-DNA水平明显低于未抗病毒治疗,且在住院时间、费用、生存时间和肿瘤复发率上抗病毒治疗均好于未抗病毒者,但低病毒复制者在住院时间、住院费用上优于高病毒复制者。在生存时间上高病毒复制者1~2年生存率更好,在肿瘤复发率上低病毒复制者更低。结论:抗病毒结合根治切除术能改善肝癌合并HBV感染者的肝功能和病毒指标,缩短住院时间,延长生存时间。     

Flow cytometric analysis of marrow cell kinetics in children treated with high-dose MTX and CF rescue

Summary Normal marrow cell kinetics were studied by flow cytometry with computer analysis in 11 children with malignancies who received high-dose MTX followed by CF rescue. Nine children with hematological tumors in remission each received an infusion of MTX over 24 h, followed by delayed CF rescue. In 8 of the 9, an accumulation of cells in early to mid-S phase and a decrease of cells in G₂/M phase were observed at 24–48 h after the beginning of the MTX infusion. At 144 h after MTX infusion this kinetic perturbation disappeared and the DNA histogram returned to the same state as before therapy. Two children who had malignant bone tumors without marrow infiltration each received an infusion of MTX over 6 h with early CF rescue following an initial IV injection of vincristine. They did not have any prominent perturbation of marrow cell kinetics after MTX exposure, except for a transient increase of cells in G₂/M phase.These results confirm that with the high-dose MTX therapy described above for hematological malignancies the impairment of marrow cell kinetics was much more severe and was soon followed by complete recovery, whereas with the therapy for solid tumors the impairment was much slighter.Abbreviations MTX methotrexate - CF citrovorum factor - FCM flow cytometry