Thoracic and cutaneous sarcoid-like reaction associated with anti-PD-1 therapy: longitudinal monitoring of PD-1 and PD-L1 expression after stopping treatment
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Immune checkpoint inhibitors (ICI) target T cell inhibitory pathways that are responsible for cancer tolerance by down-modulating immune functions. ICI have revolutionized patients care with lung cancer. Nevertheless, restoring endogenous antitumor T-cell responses can induce immune related adverse events, such as sarcoidosis.
We report here the first case of a thoracic and cutaneous sarcoid-like reaction in a patient with a relapsing unresectable non-small cell lung cancer (NSCLC) treated with nivolumab, an anti-PD-1 mAb. The expression of PD-1 and its ligands, PD-L1 and PD-L2, was assessed by flow cytometry on peripheral blood mononuclear cells (PBMC) and compared to patients who had discontinued nivolumab therapy without having developed any immune related adverse events. PD-L1 expression was transiently increased on B cells, T cells and monocytes, whereas PD-L2 expression was not modulated. PD-1 was transiently undetectable when PD-L1 was maximal, before returning to basal level. Sarcoidosis spontaneously resolved, without corticotherapy.
This case sheds the light on a complex regulation of PD-L1 expression in vivo on PBMC after nivolumab arrest and triggers the question of monitoring the expression of immune checkpoint on immune cells during and after treatment with ICI.
KeywordsLung cancer Sarcoid-like reaction Nivolumab
Lung cancer is the first and second cause of cancer mortality in men and women, respectively, thus representing an important health problem that needs new therapeutic solutions. Immune checkpoint inhibitors (ICI), consisting in neutralizing antibodies (Ab) targeting co-inhibitory molecules to restore T cell activation, have revolutionized cancer therapy. Anti-PD-1 Abs have emerged as powerful weapons. Durable objective responses following anti-PD1 Ab therapy in patients with non-small-cell lung cancer (NSLC), accompanied by extended overall survival compared with conventional therapies, supported recent regulatory approvals by the US Food and Drug Administration for the use of nivolumab and pembrolizumab, two different anti-PD1 Abs, in these indications. Nevertheless, patients treated with ICI can develop immune related adverse events, such as dermatological toxicities, as a consequence of counteracting T cell inhibition. We report here a case of sarcoidosis in a 56-year-old patient with unresectable NSLC and treated with nivolumab.
PD-1 and PD-1 ligands expression was assessed on peripheral blood mononuclear cells (PBMC) of the patient, at different time-points (days 42, 56, 147 and 251) after nivolumab arrest.
Mediastinoscopy revealed sarcoid lesions. Mediastinal nodes sizes (Fig. 2d) and skin lesions were decreased 155 days later (data not shown), while the interstitial syndrome had deteriorated (Fig. 2i). Bronchoalveolar lavage showed hypercellularity comprising 41% of lymphocytes without pathogens or cancer cells (data not shown). 348 days later, CT scan showed normal mediastinal nodes and regression of the interstitial syndrome (Fig. 2e and j).
Discussion and concluding remarks
Immune checkpoint inhibitors have revolutionized the therapeutic landscape in oncology. However, several immune-related adverse events have been described, including damages in skin, gastrointestinal tract, kidney and nervous system. Among them, 11 cases of sarcoidoisis-like syndroms have been reported during melanoma treatment with ipilimumab, an anti-CTLA-4 mAb, used alone or in combination with nivolumab [1, 2]. More recently, studies reported that the inhibition of the PD-1 / PD-1 L axis may also induce such adverse effects. Sarcoid development has also been reported in 2 melanoma patients treated with nivolumab [3, 4] and in one melanoma patient treated with an anti-PD-L1 mAb . SLR were also reported in 3 sarcoma  and one Hodgkin’s disease patient  treated with pembrolizumab. In lung cancer, one study reported a case of sarcoidosis with ipilumimab plus nivolumab . A recent publication reported nivolumab-related cutaneous sarcoidosis in a patient with lung adenocarcinoma . We report here the first case of thoracic and cutaneous sarcoidosis in a patient with lung cancer and treated with nivolumab.
To overcome the side effects of ICI, immunosuppressive drugs, such as steroids, are usually used for a short period of time, with or without retracting ICI. Interestingly, in this case, SLR resolved in the absence of corticotherapy. In support, sarcoidosis spontaneously resolved in sarcoma patients treated with pembroluzimab .
It is interesting to note that the rapid decrease of PD-L1 expression precedes the resolution of SLR. One study has reported a local upregulation of PD-L1 expression in sarcoidosis and suggested that PD-1 blockade could constitute a therapeutic target in sarcoidosis . The increase of PD-L1 may also result from the unlocking of cytokine production by activated T cells present in sarcoid lesions as well as in the peripheral blood . Indeed, restoring the functions of hyper-activated TCRhigh, and especially the secretion of IFN-γ, may favor sarcoidosis-like reaction .
Various lines of evidence support a role of the PD-1/PD-L1 pathway in the prevention and downregulation of SLR: (a) SLR can occur during anti-PD-1/PD-L1 and -CTLA-4 Ab therapies [1, 2], (b) we and others  have reported a favorable outcome after nivolumab discontinuation without corticosteroid, (c) we report that PD-L1 overexpression is concomitant with regression of clinical and radiological signs of SLR and (d) PD-L1high B cells have been shown to reduce inflammation . Collectively, our observations suggest that a dysregulated expression of PD-1 and PD-1 L is associated with clinical signs of sarcoidosis-like syndromes.
In conclusion, this study evidences an original case of sarcoidosis-like syndrome under nivolumab with spontaneous regression after treatment arrest, in the absence of corticotherapy. It also shows that, in a patient exhibiting autoimmune related effects, nivolumab arrest is associated with a delayed and complex modulation of PD-1 and PD-L1 expression on immune cells, which may contribute to restore immune homeostasis. This observation opens the question to which extent PD-1 expression in vivo controls PD-L1 expression.
The authors acknowledge patients who accepted to participate in the study and members of Immunology and Allergology laboratory of the University Hospital of Angers for expert technical support.
This work was supported by institutional grants from INSERM and University of Angers.
Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
LP and CP interpreted the datas and wrote the manuscript. SB designed and performed flow cytometry experiments. AC, MCR, SLR performed, analysed and interpreted immunohistochemical datas. NL interpreted datas regarding the PD-1/PD-L1 expression. JH and TU analysed and interpreted datas from plain chest computed tomography and wrote the manuscript. PJ wrote and corrected the manuscript. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Samples were collected after informed consent of patients (authorisation number CB2012/09).
The authors declare that they have no competing interests.
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