Anti-CD22 CAR-T cell therapy as a salvage treatment – OTT | OTT – Dove Medical Press

1Department of Hematology, Tianjin First Central Hospital, School of Medicine, Nankai University, Tianjin, Peoples Republic of China; 2The First Central Clinical College of Tianjin Medical University, Tianjin, Peoples Republic of China

Correspondence: Qi Deng No. 24, Fukang Road, Tianjin, Peoples Republic of ChinaTel +8613612055872Email [emailprotected]

Background: To observe efficacy of the anti-CD22 chimeric antigen receptor modified (anti-CD22-CAR) T cell salvage therapy in relapsed/refractory (R/R) diffuse large B-cell lymphoma (DLBCL) and B cell acute lymphoid leukemia (B-ALL) patients whose disease did not reach CR or progressed again after anti-CD19-CAR T cell therapy.Methods: In our study, seven R/R DLBCL patients reached stable disease (SD) or progression of disease (PD) after their anti-CD19-CAR T cell therapy. Only three in all the six R/R B-ALL patients obtained complete response (CR)/CR with incomplete count recovery (Cri) in their anti-CD19-CAR T cell therapy, but they relapsed again in the following three, six and one months. Then, all these thirteen R/R DLBCL and B-ALL patients received anti-CD22 CAR-T cell salvage therapy because their disease did not reach CR or progressed again.Results: Four R/R DLBCL patients obtained CR, while two R/R DLBCL patients achieved PR and one patient achieved SD. But only two R/R B-ALL patients obtained Cri in their anti-CD22 CAR-T cell salvage therapy. The overall survival (OS) of R/R DLBCL patients after the anti-CD22 CAR-T cell therapy was 6.142 3.395 months until August 31, 2020. There was no different of the median expansion peaks of the two kinds of CAR T cells (P=0.920). The time of anti-CD22-CAR T cell proportion peak days was later than that of the time of anti-CD19-CAR T cell peak days post infusion (P=0.022). Their cytokine release syndrome (CRS) was graded 2 4 in their anti-CD19-CAR T cell therapy, while the notable CRS was graded 1 2 in their anti-CD22-CAR T cell therapy. But there was no difference in the CRS and the immune effect or cell associated neurotoxic syndrome (ICANS) grades in the two kinds of therapies. And there was no difference in the hematological toxicity grades in the two kinds of therapies.Conclusion: The anti-CD22-CAR T cell salvage therapy is highly effective in R/R DLBCL patients than in R/R B-ALL patients who failed in anti-CD19-CAR T cell therapy before. We need to expand the number of R/R DLBCL or B-ALL patients and continue to observe.Trial Registration: ChiCTR-ONN-16009862 and ChiCTR1800019298.

Keywords: chimeric antigen receptor, CAR, diffuse large B-cell lymphoma, acute lymphoblastic leukemia, anti-CD19, anti-CD22

Although many acute lymphoid leukemia (ALL) and Non-Hodgkins lymphoma (NHL)patients could benefit from the conventional treatments of chemotherapy and hematopoietic stem cell transplantation, the relapsed/refractory (R/R) of these disease leads to a very poor prognosis and high mortality. Anti-chimeric antigen receptor (CAR) T cell therapy has been an effective salvage therapy for R/R hematologic malignancy, especially the anti-CD19 CAR-T therapy in R/R B-cell ALL and B-cell NHL.14 Tisagenlecleucel as the first second-generation anti-CD19 CAR-T cell therapy has approved by FDA in 2017 in R/R B-cell ALL patients.5 Although the anti-CD19 CAR-T cell therapy has amazing curative effect in R/R B-cell hematologic malignancy, the disease recurrence or progresses again after this anti-CD19 CAR-T cell therapy is a serious problem which needs to be solved urgently. One of the reasons is that the CD19 target antigen might be lost or down regulated in these patients when their disease recurrence or progresses again.69 Similar to CD19, CD22 is also a B-cell antigen expressed specially on the surface of most B-cell malignancies. Anti-CD22 CAR-T cell therapy provides a potential treatment strategy in addition to anti-CD19 CAR-T cell therapy.8,10,11 A study reported that anti-CD22 CAR-T cell therapy induced high response rates in R/R B-ALL patients whom had failed or relapsed again after a previous CD19 CAR-T cell therapy.12

Thirteen R/R diffuse large B-cell lymphoma (DLBCL) and B-ALL patients were admitted in our hospital between August 2017 and July 2018. Seven of them were R/R DLBCL patients, while six of them were R/R B-ALL patients. They all received the anti-CD19 CAR-T cell therapy when they were diagnosed as R/R DLBCL or R/RB-ALL. No patients received hematopoietic stem cell transplant(HSCT) before the two kinds of CAR-T cell therapy. The cutoff date of data collection is August 31, 2020.

The culture time of anti-CD19 CAR-T cells and anti-CD22 CAR-T cells in vitro was approximately 12 to 14 days. Anti-CD19 CAR and anti-CD22 CAR transduction efficiencies were analyzed by flow cytometry (FCM) to observe the ratio of anti-CD19-CAR T cells and anti-CD22-CAR T cells (PE, BD Biosciences) in CD3+ T cells (FITC, BD Biosciences).

To R/R DLBCL patients, therapy responses were assessed one and two months post CAR-Tcell infusion. The response to this therapy was defined as complete response (CR), partial remission (PR), stable disease (SD) and progression of disease (PD) were defined according to Lugano Revised Criteria for Response Assessment.13 To R/R B-ALL patients, therapy responses were assessed 14 days post CAR-T cell infusion. The response to this therapy was defined as complete response (CR), CR with incomplete count recovery (Cri), or no remission (NR). In our study, we observed the overall survival (OS) and the progression-free survival (PFS) in all the patients. From the date of CAR-T cell infusion, follow-up was carried out up to the cutoff date or the date of death.

All the thirteenR/R DLBCL and B-ALL patients had received the clinical trial of anti-CD19 CAR-T cell expressing anti-CD19 scFv and 41BB-CD3 costimulatory-activation domains therapy (ChiCTR-ONN-16009862) in our hospital. The leukapheresis was done when they were enrolled in this anti-CD19-CAR T cell therapy clinical trial. Then the procedures for cell production and quality-control assays were conducted according to our literature before.14 All the patients received lymphodepleting chemotherapy with fludarabine (30 mg/m2) and cyclophosphamide (400 mg/m2) from day 4 to day 2. Autologous anti-CD19-CAR T cells were infused on day 0 in R/R DLBCL and B-ALL patients (2x106 cells/kg).

All the patients whose disease did not reach CR or progressed again after anti-CD19-CAR T cell therapy received combination chemotherapy when they were waiting to enroll in the anti-CD22 CAR-T cell therapy. None of the patients received HSCT during this period. Then they received the anti-CD22 CAR-T cell therapy as a salvage therapy. It was a clinical trial of anti-CD22 chimeric antigen receptor (CAR) modified T-cell expressing anti-CD22 scFv and 41BB-CD3 costimulatory-activation domains therapy (ChiCTR1800019298) in our hospital. The leukapheresis was done again when they were enrolled in the anti-CD22-CAR T cell therapy clinical trial. The procedures for cell production and quality-control assays were as same as the anti-CD19 CAR-T cell therapy. They received the same lymphodepleting chemotherapy as that in the anti-CD19 CAR-T cell therapy. Autologous anti-CD22-CAR T cells were infused on day 0 in R/R DLBCL and B-ALL patients (2x106 cells/kg).

In peripheral blood, the proportions of anti-CD19-CAR T cells and anti-CD22-CAR T cells in CD3+ T cells was observed by flow cytometry (FCM) on day 0, 4, 7,14, 21 and 28. The expression of CD19 CAR DNA and CD22 CAR DNA was detected by quantitative polymerase chain reaction (qPCR) method on day 0, 4, 7.14, 21 and 28.

The levels of the interleukin-6 (IL-6), IL-2R, IL-8, and tumor necrosis factor- (TNF-), were observed on, 4, 7, 14, 21, and 28 days after CAR-T cell infusion by enzyme-linked immunosorbent assay. The AEs were observed throughout the two kinds of CAR-T cell therapy. The cytokine release syndrome (CRS) grade was determined according to the National Cancer Institute Common Terminology Criteria for AE v4.03.15 The neurotoxicity syndrome was determined according to the Immune effector cell associated neurotoxic syndrome (ICANS)16 in the two therapies.

The differences between the anti-CD19-CAR T cell therapy and the anti-CD22-CAR T cell therapy were analyzed. Chi-square test was used for counting data. T test was used for the measurement data conforming to normal distribution, and rank sum test was used for the measurement data not conforming to normal distribution. Non-normal distribution data are expressed as a median and interquartile range (IQR) unless otherwise indicated. The probabilities of PFS and OS were estimated by the Kaplan-Meier method and were compared with the Log rank test. SPSS 17.0 (SPSS Inc., Chicago, IL, USA) software was used for all the statistical analyses in our study. The P-value less than 0.05 was considered statistically significant.

The patient characteristics of the thirteen R/R DLBCL and B-ALL patients before their anti-CD19-CAR T cell therapy are listed in Table 1. High CD19 antigen was expressed on malignant B cells analyzed by FCM in all the six R/R B-ALL patients (Figure 1). All the thirteen R/R DLBCL and B-ALL patients received the anti-CD22 CAR-T cell therapy because their disease was diagnosed as non-remission or progress again after the previous anti-CD19 CAR-T cell therapy. The median age of all the patients was 46.31 years (Range 1670 years) in our study.

Table 1 Patients Baseline and Therapy-Related Characteristics

Figure 1 CD19 and CD22 antigen expression on malignant B cells in the six R/R B-ALL patients. (A, C, E, G, I, K). High expression ofCD19 antigen on malignant B cells in the six R/R B-ALL patients before anti-CD19-CAR T cell therapy. (B, D, F, H, J, L). Normal or low expression of CD19 antigen, with high expression of CD22 antigen on malignant B cells in the six R/R B-ALL patients before anti-CD22-CAR T cell therapy.

The mean anti-CD19-CAR transduction efficiency of the thirteen patients was 47.1817.43%. The mean quantity of anti-CD19-CAR T cells were 5.893.93106 cells/kg when the cells were harvested. Autologous anti-CD19-CAR T cells were infused on day 0 in R/R DLBCL patients (2.090.17106 cells/kg) and in R/R B-ALL patients (2.050.29106 cells/kg).

The mean CD22-CAR transduction efficiency in the final products of the thirteen patients was 42.0719.23%. The mean quantities of anti-CD22-CAR T cells were 4.032.37106 cells/kg. Autologous anti-CD22-CAR T cells were infused on day 0 in R/R DLBCL patients (2.110.24106 cells/kg) and in R/R B-ALL patients (2.070.42106 cells/kg).

One and two months post the anti-CD19-CAR T cell infusion, we evaluated the efficacy of all the seven R/R DLBCL patients. Four R/R DLBCL patients (Pt 13, 5) obtained SD from the anti-CD19-CAR T cell therapy. Three R/R DLBCL patients (Pt 4, 6.7) did not respond to the anti-CD19-CAR T cell therapy and achieved PD only (Figure 2A and B).The patients disease did not allow a biopsy for immunohistochemical detection of CD22 expression before their anti-CD22-CAR T cell therapy.

Figure 2 Clinical responses to the two kinds of CAR-T cell therapy. (A). Clinical responses and survival time of all the thirteen R/R DLBCL and B-ALL patients. (B). Clinical responses to the two kinds of CAR-T cell therapy in the seven R/R DLBCL patients. (C). Clinical responses to the two kinds of CAR-T cell therapy in the six R/R B-ALL patients. D. PFS and OS in the R/R DLBCL and B-ALL patients after their anti-CD22-CAR T cell therapy.

Two weeks post the anti-CD19-CAR T cell infusion, we evaluated the efficacy of the six R/R B-ALL patients. Three R/R B-ALL patients (Pt 9, 11, 12) obtained CR/Cri, while the other three R/R B-ALL patients (Pt 8, 10,13) obtained NR with high CD19 expression on malignant B cells. Although the three R/R B-ALL patients (Pt 9, 11, 12) achieved CR/Cri, they relapsed again in the following three, six and one month (Figure 2A and C).The six R/R B-ALL patients had normal or low expression of CD19 antigen, and high expression of CD22 antigen on malignant B cells analyzed by FCM before their anti-CD22 CAR-T cell therapy (Figure 1).

One and two months after their anti-CD22-CAR T cell therapy, four R/R DLBCL patients (Pt 14) obtained CR, while two R/R DLBCL patients (Pt 5, 7) achieved PR and one patient (Pt 6) achieved SD (Figure 2A and B). Two weeks after the anti-CD22-CAR T cell infusion, only two R/R B-ALL patients (Pt 11, 12) obtained Cri, while the other four R/R B-ALL patients (Pt 810, 13) obtained NR only (Figure 2A and C).After their anti-CD22-CAR T cell therapy, Pt 2 and Pt 12 received allogeneic HSCT.

The anti-CD22 CAR-T cell therapy in R/R DLBCL patients, four (4/7) patients achieved CR, six (6/7) patients achieved overall response rate (ORR). Kaplan-Meier analysis showed that the PFS of R/R DLBCL patients and R/R ALL patients who did not receive allo-HSCT after the anti-CD22 CAR-T cell therapy are 66.7% and 20.0% 180 days after anti-CD22 CAR-T cell therapy until August 31, 2020 (P=0.058). While the OS of R/R DLBCL patients and R/R ALL patients who did not receive allo-HSCT after the anti-CD22 CAR-T cell therapy are 67.07% and 20.5% 180 days after anti-CD22 CAR-T cell therapy (P=0.058) (Figure 2D and E).

The proportions of anti-CD19-CAR T cells and the levels of CD19 CAR DNA were detected 0, 4, 7, 14, 21, 28 days post the anti-CD19-CAR T cell infusion. Median expansion peak of the anti-CD19-CAR T cells in CD3+ T cells in peripheral blood was 2.36% (2.06,5.24) % on 7(7,7) days post infusion. While, median expansion peak of the anti-CD22-CAR T cells was 2.24% (2.04, 9.28) % on 14 (7, 14) days post infusion (Figure 3A and B). The levels of CD19 CAR DNA and CD22 CAR DNA showed the same variation trend. The median peak of CD19 CAR DNA was 1290 (900, 2636) copies/g on 7(7, 7) days post the anti-CD19-CAR T cell infusion. While, the median peak of CD22 CAR DNA was 1240 (960, 2580) copies/g on 14 (14, 14) days post the anti-CD22-CAR T cell infusion (Figure 3C and D).

Figure 3 The proportions of two kinds of CAR-T cells, the levels of two kinds of CAR DNA in peripheral blood. (A and B). The proportions of two kinds of CAR-T cells on 0, 4, 7, 14, 21, 28 days post the CAR-T cell infusion. (C and D). The levels of two kinds of CAR DNA on 0, 4, 7, 14, 21, 28 days post the CAR-T cell infusion.

There was no different of the median expansion peaks of the two kinds of CAR-T cells, and no different of the median peak copy of the two kinds of CAR DNA (P=0.920 and P=0.880). The time of anti-CD22-CAR T cell proportion peak were later than that of the time of anti-CD19-CAR T cell peak post infusion (P=0.022).The DNA level CAR gene showed the same trend (P=0.001)(Figure 4).

Figure 4 Different of the expansion of the two kinds of CAR-T cells. (A) There was no different of the median expansion peaks of the two kinds of CAR-T cells (P=0.920). (B). The time of anti-CD22-CAR T cell proportion peak were later than that of the time of anti-CD19-CAR T cell peak (P=0.022). (C). There was no different of the median peak of the two kinds of CAR DNA (P=0.880). (D). The time ofCD22 CAR DNA peak were later than that of the time of CD19 CAR DNA peak (P=0.001).

In the anti-CD19-CAR T cell therapy, patients developed fever with or without chills, fatigue, headache, nausea, edema, tachycardia, cough, and other symptoms (Table 2).The rates of CRS and ICANS were listed in Table 2. Their CRS was graded 24 in their anti-CD19-CAR T cell therapy. The notable CRS was graded 12in their anti-CD22-CAR T cell therapy. But there was no different of the CRS grades in the two kinds of therapy (P=0.341) (Figure 5A). Two patients developed grade 1 ICANS in the anti-CD19-CAR T cell therapy. But no patient was diagnosed as ICANS in the anti-CD22-CAR T cell therapy. There was no different of the ICANS grades in the two kinds of therapy (P=0.480) (Figure 5B). Hematological toxicity was grade 24 in anti-CD19-CAR T cell therapy. While it was grade 13 in their anti-CD22-CAR T cell therapy. There was no different of the hematological toxicity grades in the two kinds of therapies (PWBC=0.148, PHb=0.425 and PPLT=0.813) (Figure 5CE). It occurred from 5 to 7 days after CAR-T cell infusion and recovered 1416 days after the CAR-T cell infusion. Although the hematological toxicity in the process of therapy, only three R/R B-ALL patients were diagnosed with gram-negative organism bacterial infections in anti-CD19-CAR T cell therapy. Their infectious disease was cured by antibiotics and supportive treatment. There was no patient was diagnosed with bacterial infections in R/R DLBCL patients in their anti-CD19-CAR T cell therapy, while no patient in all the thirteen patients was diagnosed with bacterial infections in anti-CD22-CAR T cell therapy. There was no patient was diagnosed with invasive fungal disease also.

Table 2 The Notable Adverse Events (AEs) in the Two Time of CAR-T Cell Therapies

Figure 5 Grades of CRS, ICANS and hematological toxicity in the two kinds of CAR-T cell therapy. (A). There was no different of the CRS grades in the two kinds of therapy. (B). There was no different of the ICANS grades in the two kinds of therapy. (C-E). There was no different of the hematological toxicity grades in the two kinds of therapies.

The serum levels ofIL-6, IL-2R, IL-8 and TNF- were observed in the two kinds of CAR-T cell therapies (Figure 6AH).The peaks of IL-6, IL-2Rand TNF- were higher in their anti-CD19-CAR T cell therapy than that of in their anti-CD22-CAR T cell therapy (P IL-6=0.044, PIL-2R=0.004, P IL-8=0.064 and PTNF-=0.019)(Figure 7AD). The mean peaks of IL-6, IL-8, IL-2R and TNF- in anti-CD19-CAR T cell therapy was at 6.61 2.53 days, 5.151.46 days, 6.612.53 days and 6.852.41 days after infusion. While the mean peaks of IL-6, IL-2R, IL-8 and TNF- in anti-CD22-CAR T cell therapy was at 11.083.93 days, 11.853.36 days, 12.383.07 days and 11.313.54 days after infusion. The time of the mean peaks of IL-6, IL-2R and TNF- in anti-CD22-CAR T cell therapy were later than that of the time in anti-CD19-CAR T cell therapy (P IL-6=0.005, PIL-2R=0.000, P IL-8=0.239 and PTNF-=0.004) (Figure 7EH).

Figure 6 The serum levels of IL-6, IL-2R, IL-8 and TNF- in anti-CD19-CAR T cell and anti-CD22-CAR T cell therapy. (A). The serum levels of IL-6 in anti-CD19-CAR T cell therapy. (B). The serum levels of IL-8 in anti-CD19-CAR T cell therapy. (C). The serum levels of IL-2R in anti-CD19-CAR T cell therapy. (D). The serum levels of TNF- in anti-CD19-CAR T cell therapy. (E). The serum levels of IL-6 in anti-CD22-CAR T cell therapy. (F). The serum levels of IL-8 in anti-CD22-CAR T cell therapy. (G). The serum levels of IL-2R in anti-CD22-CAR T cell therapy. (H). The serum levels of TNF- in anti-CD22-CAR T cell therapy.

Figure 7 Different of the peaks and peak times of the serum cytokines. (A-D). The peaks of IL-6, IL-2R and TNF- were higher in anti-CD19-CAR T cell therapy than that of in anti-CD22-CAR T cell therapy. (E-H). The time of the mean peaks of IL-6, IL-2R and TNF- in anti-CD22-CAR T cell therapy were later than that of the time in anti-CD19-CAR T cell therapy.

The patients received methylprednisolone, antipyretic drugs and symptomatic treatment to overcome the AEs. Only the R/R B-ALL patient 12 received tocilizumab during her anti-CD19-CAR T cell therapy and anti-CD22-CAR T cell therapy. AEs related to the two kinds of CAR-T cell therapies were relieved 14 to 16 days post the two kinds ofCAR-T cell infusion. No patients died of CRS and ICANS in their anti-CD19-CAR T cell oranti-CD22-CAR T cell therapy.

Patients with R/R B cell malignancies respond poorly to conventional treatment, anti-CD19-CAR T cell therapy had demonstrated remarkable anti-tumor activity for these patients and improved their prognosis. The CR rate of R/R B-ALL to anti-CD19-CAR T cell therapy could be achieved about 70% to 90%,17 while the overall response rate (ORR) of R/R B-NHL to anti-CD19-CAR T cell therapy could be achieved about 50% to 70%.1821 Despite the great success of anti-CD19-CAR T cell therapy in R/R B-ALL and B-NHL, there are still some patients with poor efficacy to this therapy.6,22,23 Patients relapsed after anti-CD19-CAR T cell therapy with lost or mutated of CD19 expression on tumor cells, which was one of the reasons for the failure of the second anti-CD19-CAR T cell therapy. So we need other targets for CAR-T cell therapy as a salvage therapy to such patients.

CD22 as a type I transmembrane glycoprotein which expressed on the surface of tumor cells in most B cell malignancies, such as B-ALL, DLBCL, chronic lymphocytic leukemia, and other B-NHL. CD22 could be used as an ideal target for patients who relapse again after anti-CD19-CAR T cell therapy or has no response to anti-CD19-CAR T cell therapy.8,2427In previous studies, CD22 monoclonal antibodies, including epituzumab and Inotuzumab Ozogamicin, have been reported to have significant antitumor activity in patients with B-ALL or B-NHL.26,2830What about the efficacy of anti-CD22-CAR T cell therapy in patients with B cell malignancies that resist to anti-CD19-CAR T cell therapy? What is the efficacy of anti-CD22-CAR T cell therapy in patients with R/R B-cell malignancies who relapse again after anti-CD19-CAR T cell therapy or has no response to this therapy. A recent study reported that anti-CD22-CAR T cell therapy induced CR in 73% of R/R B-ALL patients who were resistant or ineffective to anti-CD19-CAR T cell therapy before.12 What is the efficacy of anti-CD22-CAR T cell therapy in salvage therapy after failure of anti-CD19-CAR T cell therapy for R/R DLBCL? Future studies are needed to determine.

In our study, thirteen R/R DLBCL and B-ALL patients received anti-CD22 CAR-T cell salvage therapy when they relapsed after their previous anti-CD19 CAR-T cell therapy. Seven R/R DLBCL patients and six R/R B-ALL patients received the anti-CD19 CAR-T cell therapy. But the R/R DLBCL patients obtained SD or PD only, while three R/R B-ALL patients obtained NR, three R/R B-ALL patients relapsed again soon with low expression of CD19 on malignant B cells after they obtained CR/Cri. As a salvage treatment after this anti-CD19-CAR T cell therapy, they all received an anti-CD22 CAR-T cell therapy. Interestingly, except for one R/R DLBCL patient who attained SD, all the other six R/R DLBCL patients received CR in the anti-CD22 CAR-T cell therapy. Only two R/R B-ALL patients obtained CR/Cri in the anti-CD22 CAR-T cell salvage therapy, although they all had high expression of CD22 on their malignant B cells. The PFS and OS of anti-CD22-CAR T cell salvage therapy were higher in R/R DLBCL patients than that of in R/R B-ALL patients, but there was no difference in the R/R DLBCL and R/R B-ALL patients.

The CRS and ICANS as the significant side effects were treatment-related toxicities of CAR-T cell therapies, which could be fatal if it was severe or not handled properly.1,17 In our study, anti-CD22-CAR T cell therapy was more effective than anti-CD19-CAR T cell therapy in more patients. But the CRS was 12 grades in anti-CD22-CAR T cell therapy, while the CRS was 24 grades in anti-CD19-CAR T cell therapy. There was no ICANS occurred in the anti-CD22-CAR T cell therapy, but it occurred in the anti-CD19-CAR T cell therapy in two patients. It was consistent with previous studies.12,19,31,32 Hematological toxicity was more significant in anti-CD19-CAR T cell therapy than that of in anti-CD22-CAR T cell therapy. The anti-CD22-CAR T cell therapy showed effective anti-tumor activity as a salvage therapy with controllable toxicity. Another aspect is whether it could be used as an option for high-risk patients with ICANS in CAR-T cell therapies to R/R B-ALL patients. The number of cases in this study is relatively small, we need to expand the number of R/R DLBCL or B-ALL patients and continue to observe.

The cause of relapse again after the anti-CD22-CAR T cell therapy is unknown at present. A study reported that R/R B-ALL patients who were poor efficacy to anti-CD19-CAR T cell therapy might relapse again after their anti-CD22-CAR T cell therapy.6 Another study demonstrated that the anti-CD22-CAR T cell therapy is highly effective in R/R B-ALL patients who had received prior anti-CD19-CAR T cell therapy might still face a high rate of recurrence.12 In our study, the anti-CD22-CAR T cell salvage therapy was not effective in such R/R B-ALLpatients. But we found that the anti-CD22-CAR T cell therapy is highly effective in R/R DLBCL patients who failed in anti-CD19-CAR T cell therapy before. The anti-CD22-CAR T cell salvage therapy is more effective in R/R DLBCL patients than that in R/R B-ALL patients. Further clinical observation is needed in the future.

How to maintain remission status is a challenge after CAR-T cell therapy in R/R DLBCL and B-ALL, especially in patients who could not receive bridging hematopoietic stem cell transplantation.6 Some studies21,23,3337 suggested that CAR-T cell therapy targeting both CD19 and CD22 might reduce tumor escape and might achieve more lasting remission than targeting a single CD19 or CD22antigen. But not all R/R DLBCL and R/R B-ALL patients could receive a two-target of anti-CD19-CAR and anti-CD22-CAR T cell therapy. Our results could suggest that R/R DLBCL patients rather than R/R B-ALL patients might benefit from the anti-CD22-CAR T cell salvage therapy. Of course, a larger number of patients need to be enrolled in order to confirm these conclusions.

We found that the anti-CD22-CAR T cell salvage therapy is highly effective in R/R DLBCL patients than in R/R B-ALL patients who failed in anti-CD19-CAR T cell therapy before. The anti-CD22-CAR T cell therapy showed effective anti-tumor activity as a salvage therapy with controllable toxicity. We need to expand the number of R/R DLBCL or B-ALL patients and continue to observe.

ALL, acute lymphoid leukemia; AEs, adverse events.Anti-CD22-CAR, anti-CD22 chimeric antigen receptor; CAR, chimeric antigen receptor; CRS, cytokine release syndrome; CR, complete response; Cri, CR with incomplete count recovery; DLBCL, diffuse large B-cell lymphoma; FCM, flow cytometry; HSCT, hematopoietic stem cell transplant; ICANS, Immune effector cell associated neurotoxic syndrome; IL-6, the interleukin-6; NHL, Non-Hodgkins lymphoma; NR, no remission; OS, the overall survival; ORR, overall response rate; PD, progression of disease; PR, partial remission; qPCR, quantitative polymerase chain reaction; R/R, relapsed/refractory; SD, stable disease; TNF-, tumor necrosis factor-.

The datasets used and/or analyzed during this study are available from the corresponding authors on reasonable request.

This study was approved by the Medical Ethics Committee of the Department of Hematology, Tianjin First Center Hospital (Tianjin, China). (Approved No. of ethic committee: 2018N105KY and 2015002X), and informed consent was obtained from the participants. All the data and material have been performed in accordance with the Declaration of Helsinki and conformed to relevant aspects of the ARRIVE guidelines.

The Clinical trial in our study was registered at http://www.chictr.org.cn/index.aspx as ChiCTR-ONN-16009862 and ChiCTR1800019298.

All the patients provided signed consent before enrollment in the clinical trial and agreed to the use of his specimens and data for our study.

All authors contributed to data analysis, drafting or revising the article, have agreed on the journal to which the article will be submitted, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.

We thank all our patients for their participation in our clinical trials.

There is no funding to report.

The authors declare that they have no conflict of interests.

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