给免疫治疗“减毒增效”的辅助用药（一）

以ICI为代表的免疫治疗单药有效率太低，尤其是对所谓冷肿瘤；联合做增敏增效治疗是主要出路。
但人的免疫系统是个整体，那些免疫细胞相关的因素也并非只管肿瘤，增敏增效治疗有可能增加全身炎症；即便是直奔肿瘤去的，过于放飞自我的免疫细胞掀起的免疫活动的强度，患者也未必能耐受得了；ICI治疗本身就风险巨大，再叠加这些风险因素，有时候就表现为“怕你死得不够快”了。
比如下面这例：
- {  {1 q  J9 P% F% {《Anti-PD-1 Immunotherapy Combined With Stereotactic Body Radiation Therapy and GM-CSF as Salvage Therapy in a PD-L1-Negative Patient With Refractory Metastatic Esophageal Squamous Cell Carcinoma: A Case Report and Literature Review》
这篇论文讲了一个很时髦的疗法，“布拉格疗法”---ici+放疗+特尔立（gm-csf），治疗一位食管癌患者。
1 K& _' w. Z/ M( H增敏增效的疗效肯定是有的，因为这位患者pd-l1是阴性的，布拉格治疗也起效了。
但是患者第三次治疗的时候就因为严重的肺炎死了。
9 b1 T! \+ n' E+ Y直接对肺病灶放疗，肺炎本身就不可避免；会急剧加重炎症的pd-1i、gm-csf再联着用；再配上只会用激素的一言难尽的治疗措施.........
“This study aimed to report a case of a patient about advanced unresectable ESCC negative expression of PD-L1, who experienced tumor progression after chemoradiotherapy and targeted therapy.A significant systemic effect was seen after PD-1 inhibitor combined with GM-CSF and stereotactic body radiotherapy (SBRT) for metastatic lesions, however, severe pneumonia occurred after the triple-combination therapy. ”

3 {7 o6 f: J: |( i, s# E0 s所以一切给免疫增敏增效的治疗，“减毒”要与“增效”并重，甚至“减毒”要在“增效”之前。
5 q0 R7 l! I7 l! X8 M( L4 f7 T& y" q这里的“减毒”，主要指的是 1、尽量不增加不可控的炎症风险 2、最好能对那些不利的促炎细胞因子、趋化因子之类的有所抑制。

$ |8 A' a/ H# o7 ], {$ Y简化的办法就是从消炎药中去找增敏增效药。当然消炎药也要看其具体作用机制，如果是增加treg等四座大山来消炎的，那也有免疫抑制促肿瘤发展的风险，那也不能用。

* M9 {, g3 g, A: G/ v) t% _从今天开始陆续介绍一些给免疫治疗“减毒”“增效”的辅助用药。


H1受体拮抗剂抗组胺药
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一、几个回顾性的研究

1、《Efficacy of cationic amphiphilic antihistamines on outcomes of patients treated with immune checkpoint inhibitors》
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: ]/ S% \5 f/ @2 xICI+地氯雷他定或者赛庚啶或者依巴斯汀这三种H1受体拮抗剂抗组胺药的患者与只用ICI患者相比，中位总生存期显著延长(24.8个月对10.4个月；Log-rank，p = 0.018)，无进展生存期显著延长(10.6对4.93个月；对数秩，p = 0.004)；全因死亡率降低了约50%(HR，0.55 [95% CI: 0.34-0.91])。
$ L, T; N. |4 C6 V; i“Compared with non-cationic amphiphilic antihistamine users, patients who received cationic amphiphilic antihistamines had a significantly longer median overall survival (24.8 versus 10.4 months; Log-rank, p = 0.018) and progression-free survival (10.6 versus 4.93 months; Log-rank, p = 0.004). The use of cationic amphiphilic antihistamines was associated with an approximately 50% lower risk of all-cause mortality (HR, 0.55 [95% CI: 0.34-0.91]). Survival benefits were not seen in patients who received cationic amphiphilic antihistamines before immune checkpoint blockade.”
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! o" v' l1 |: ^' u# x- b( O- D: s$ m2、《Impact of antihistamines use on immune checkpoint inhibitors response in advanced cancer
patients》

一共纳入133名已经发生转移并使用ici治疗的肿瘤患者，其中黑色素瘤(33.1%)患者最多。最常见的ICI是nivolumab (63.2%)。55名(38.4%)患者在接受ICIs的同时接受了抗组胺药。最常见的抗组胺药是pheniramine(85.5%)。同时接受抗组胺药和ICIs的患者，中位无进展生存期(PFS) (8.2比5.1个月，log-rank p = 0.016)和总生存期(OS) (16.2比7.7个月，log-rank p = 0.002)更长。在多变量分析中，在校正混杂因素(如表现状态、骨或肝转移和同步化疗)后，这些患者的PFS(风险比(HR) = 0.63，95% CI:0.40–0.98，p = 0.042)和OS (HR = 0.49，95% CI:0.29–0.81，p = 0.006)也更好。
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“A total of 133 patients receiving ICIs in the metastatic setting were included. Melanoma (33.1%) was the most common tumor type. The most common ICI was nivolumab (63.2%). Fifty-fi ve (38.4%) patients received antihistamines concomitantly with ICIs. The most common antihistamine was pheniramine (85.5%). The median progression-free survival (PFS) (8.2 vs. 5.1 months, log-rank p = 0.016) and overall survival (OS) (16.2 vs. 7.7 months, log-rank p = 0.002) were longer in patients receiving antihistamines concomitantly with ICIs. In multivariate analysis, PFS (Hazard Ratio (HR) = 0.63, 95% CI:0.40–0.98, p = 0.042) and OS (HR = 0.49, 95% CI:0.29–0.81, p = 0.006) were also better in those patients after adjusting for confounding factors, such as performance status, bone or liver metastasis, and concurrent chemotherapy”

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3、《Concomitant medication of cetirizine in advanced melanoma could enhance anti-PD-1 efficacy by promoting M1 macrophages polarization》
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8 g4 a4 P/ g8 Z$ C. \$ A# `接受西替利嗪联合抗PD-1药物治疗的患者无进展生存期显著延长(PFS平均无病生存期:28个月对15个月，风险比0.46，95%可信区间:0.28-0.76；p = 0.0023)和OS(平均OS为36比23个月，HR为0.48，95% CI为0.29-0.78；p = 0.0032)。伴随治疗与ORR和DCR显著相关 (p < 0.05).

“atients treated with cetirizine concomitantly with an anti-PD-1 agent had significantly longer progression-free survival (PFS; mean PFS: 28 vs 15 months, HR 0.46, 95% CI: 0.28-0.76; p = 0.0023) and OS (mean OS was 36 vs 23 months, HR 0.48, 95% CI: 0.29-0.78; p = 0.0032) in comparison with those not receiving cetirizine. The concomitant treatment was significantly associated with ORR and DCR (p < 0.05). ”


* ]( f" |9 D" Y& L4、《The allergy mediator histamine confers resistance to immunotherapy in cancer patients via activation of the macrophage histamine receptor H1》
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血浆组胺水平低的癌症患者对抗PD-1治疗的客观缓解率是血浆组胺水平高的患者的三倍以上。
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“cancer patients with low plasma histamine levels had a more than tripled objective response rate to anti-PD-1 treatment compared with patients with high plasma histamine.”
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二、增效的作用机制
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1、2021年的《Allergic Mediator Histamine Confers Immunotherapy Resistance in Cancer Patients via Histamine Receptor 1 on Macrophage》这篇论文讲，组胺受体H1 (HRH1)在肿瘤微环境里的TAM肿瘤相关巨噬细胞上表达，这种表达会诱导TAM极化成促癌的M2表型，抑制CD8+T细胞的功能。

9 Y! Z3 P! K. [) m: C1 w! \4 h' D2、2022年的《Concomitant medication of cetirizine in advanced melanoma could enhance anti-PD-1 efficacy by promoting M1 macrophages polarization》这篇论文验证了上述观点。用了H1抗组胺药cetirizine后，与接受西替利嗪的患者的血液样品中的基线相比，巨噬细胞的特异性标记物FCGR1A/CD64的表达在治疗后增加，但在仅接受抗PD1的患者中没有增加，并且与干扰素途径相关的基因如CCL8的表达正相关(rho = 0.32p = 0.0111)，ifit 1(rho = 0.29；p = 0.0229)，ifit 3(rho = 0.57；p %3C 0.0001)，ifi 27(ρ= 0.42；p = 0.008)，MX1(ρ= 0.26；p = 0.0383)和RSA D2(ρ= 0.43；p = 0.0005)。“he expression of FCGR1A/CD64, a specific marker of macrophages, was increased after the treatment in comparison with baseline in blood samples from patients receiving cetirizine, but not in those receiving only the anti-PD1, and positively correlated with the expression of genes linked to the interferon pathway such as CCL8 (rho = 0.32; p = 0.0111), IFIT1 (rho = 0.29; p = 0.0229), IFIT3 (rho = 0.57; p < 0.0001), IFI27 (rho = 0.42; p = 0.008), MX1 (rho = 0.26; p = 0.0383) and RSAD2 (rho = 0.43; p = 0.0005).” FCGR1A/CD64是M1型巨噬细胞的特异性标志物。（https://www.uniprot.org/uniprot/ UniProtP12314）

TAM是肿瘤微环境中免疫抑制的四座大山之一，属于普遍共性问题。

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三、减毒的作用机制

1、抑制IL-1β、 IL6、IL8等促炎细胞因子。

4 h: w* t. x5 O+ k" m  M; @例如 “Both H1 antihistamines reduce all symptoms of allergic rhinitis, including nasal congestion and the plasmatic level of IL-1β, IL-6, IL-8 and TNF-α, after 4 weeks of treatment. ” （《In Vivo Anti-Inflammatory Effect of H1 Antihistamines in Allergic Rhinitis: A Randomized Clinical Trial》）

( V. f, ?, A; y7 `2、抑制 NF-KB

% @# X8 `$ r$ O0 R0 E# q8 T, b6 z“H1 antihistamines reduced basal NF-kappaB activity (rank order of potency: desloratadine > pyrilamine > cetirizine > loratadine > fexofenadine).” （《Desloratadine inhibits constitutive and histamine-stimulated nuclear factor-kappaB activity consistent with inverse agonism at the histamine H1 Receptor》）
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