Incidence of pneumonitis/interstitial lung disease induced by HER2-targeting therapy for HER2-positive metastatic breast cancer



Anti-human epidermal growth factor receptor 2 (HER2) therapies are associated with interstitial lung disease (ILD), also referred to as pneumonitis. In this literature review, we describe the incidence of ILD among patients with HER2-positive metastatic breast cancer (MBC) receiving anti-HER2 therapies, and we describe existing recommendations for monitoring and managing drug-induced ILD among these patients.


We searched PubMed and Embase to identify clinical trials and postmarket observational studies that investigated anti-HER2 therapies for HER2-positive MBC, reported on ILD, and were published during January 1, 2009 to July 15, 2019. Articles were screened by two researchers; data were extracted from the full-text articles.


The 18 articles selected for this review assessed 9,886 patients who received trastuzumab (8 articles), lapatinib (4 articles), trastuzumab emtansine (3 articles), trastuzumab deruxtecan (2 articles), or trastuzumab duocarmazine (1 article). The overall incidence of all-grade ILD was 2.4% (n = 234), with 66.7% (n = 156) occurring as grade 1–2 events, 0.5% grade 3–4 (n = 54; incidence), and 0.2% grade 5 (n = 16; incidence). The highest ILD incidence (21.4%) was among patients receiving trastuzumab combined with everolimus and paclitaxel. Ten studies indicated that ILD events were managed via dose interruption, dose reduction, or treatment discontinuation; two studies included detailed guidelines on managing drug-induced ILD.


ILD is a well-described adverse drug reaction associated with several anti-HER2 drugs. Published ILD management guidelines are available for few anti-HER2 treatment regimens; however, guidance for monitoring for anti-HER2 drug-induced ILD is lacking.


Approximately 15–20% of patients with breast cancer have tumors that overexpress human epidermal growth factor receptor 2 (HER2), which are associated with an aggressive clinical phenotype and poor prognosis [1, 2]. The development and clinical integration of anti-HER2 therapies, including trastuzumab, pertuzumab, lapatinib, neratinib, and trastuzumab emtansine (T-DM1), has resulted in extended survival in patients with HER2-positive breast cancer [3,4,5,6,7]. Several anti-HER2 therapies, as well as other anticancer agents (e.g., cyclin-dependent kinase-4/-6 inhibitors, immune checkpoint inhibitors, mammalian target of rapamycin [mTOR] inhibitors), have been linked to an increased risk of drug-induced interstitial lung disease (ILD) [3, 4, 7,8,9,10]. Drug-induced ILD encompasses a group of serious, and sometimes life-threatening pulmonary conditions characterized by fibrosis and inflammation of the lung interstitium [11, 12].

Corticosteroids or oral prednisone are frequently used pharmacologic therapies for ILD that may effectively slow or reverse ILD disease progression [12]. While guidance is available on the diagnosis and treatment of drug-induced ILD [13], there is limited guidance on disease monitoring and management for patients with ILD induced by HER2-targeted therapies. This may be due to variability in the terminology used to describe ILD in the literature, as well as limited provider experience in routinely diagnosing and managing ILD [12, 14].

The objective of this review is to describe the incidence and severity of drug-induced ILD across currently approved and investigational anti-HER2 therapies in female patients with metastatic breast cancer (MBC), and describe recommendations for monitoring and management of anti-HER2 drug-induced ILD among MBC patients.


PubMed and Embase databases were searched for phase 2, 3, and 4 clinical studies that assessed current and investigational therapies for HER2-positive MBC. The predefined search terms included combinations of free text and Medical Subject Headings (MeSH). All databases were searched for English-language articles only, during the period of January 1, 2009, through July 15, 2019, and with no geographic restrictions imposed. Bibliographies of systematic literature reviews (SLRs) and recent articles published after the database search time window were examined to identify additional relevant publications.

Article screening and selection were conducted in two phases. In the first phase, titles and abstracts of articles identified from the electronic databases were reviewed by one researcher for eligibility according to the inclusion and exclusion criteria, which are outlined in Table S-1, Supplementary Material, including the terms used to describe ILD (i.e., pulmonary fibrosis, pneumonitis, organizing pneumonia, acute interstitial pneumonitis, diffuse parenchymal lung disease, pulmonary eosinophilia, ILD). In the second phase, the full text of the articles selected in the first phase was obtained and reviewed for eligibility by a second researcher using the same inclusion and exclusion criteria. Uncertainty about the inclusion of articles was resolved by discussion and consensus of two researchers. Information was extracted from full-text publications using a data extraction template with prespecified fields. Quality control procedures included verification of all extracted data with original sources by a researcher who did not perform the primary data extraction.


Of the 240 studies identified through database searching, 158 titles and abstracts were identified in the PubMed and Embase databases after removing duplicate articles, as well as eight additional articles identified through the SLR bibliography search (Fig. 1). Of the 166 total articles that were reviewed in the first screening phase, 76 were eligible for a full-text review based on the inclusion and exclusion criteria. During the full-text review, a total of 60 articles were excluded, with the majority (n = 45 [75.0%]) excluded because they did not report on ILD. Fifteen articles from the electronic database search and one from the SLR bibliography search were eligible for inclusion in the review. Two additional relevant studies (one for trastuzumab deruxtecan [T-DXd] [15] and one for trastuzumab duocarmazine [16]) were identified via manual searches, yielding a total of 18 articles that were included in the review.

Fig. 1

PRISMA Diagram of Articles Included in Review. HER2 human epidermal growth factor receptor 2, PRISMA preferred reporting items for systematic reviews and meta-analyses, SLR systematic literature review. aIncludes one article on T-DXd published after the search cut-off date [15], and one phase 1 study describing trastuzumab duocarmazine, an investigational anti-HER2 drug that is suspected to be associated with treatment-related interstitial lung disease [16]

The study and patient characteristics for the 18 articles in the review are presented in Table 1. Studies reported at least 99% enrollment of female patients, except for one study that reported enrolling 77% and 82% female patients in two study cohorts [16]. Age (median) at enrollment ranged from 47 to 57 years [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]. In 12 studies, 54% to 100% of patients were white [15,16,17, 19,20,21, 23,24,25,26, 29, 31]. A majority of enrolled patients were Asian in two studies (54% [27] and 100% [30]). Two studies reported nearly equivalent proportions of white and Asian patients [22, 32]. Most studies (n = 11) were conducted in an international setting, enrolling patients in multiple countries and continents. Three studies were conducted solely in the United States (US) [17, 24, 31], while others enrolled patients in both the US and Japan [27], Europe [16], France [18], or China [30].

Table 1 Study and patient characteristics by anti-HER2 drugs

The reported proportion of patients with positive hormone receptor (i.e., estrogen receptor and/or progesterone receptor) status ranged from 42 to 70%. Nearly all patients had an Eastern Cooperative Oncology Group (ECOG)/World Health Organization performance status of 0 or 1 (at least 92% in each treatment group); however, five studies enrolled a minimal number of patients with an ECOG performance status of 2, ranging from less than 1% to 8% of patients [15, 19, 24, 26, 29]. The shortest time (median) since breast cancer diagnosis was 22 months [32] and the longest was 71.5 months (among patients negative for programmed cell death-1 ligand-1 [PD-L1]) [28]. All but one study [25] included patients who had received previous breast cancer treatment. Among the six studies that reported on radiotherapy history [18, 19, 22, 25, 27, 31], the proportion of patients with previous radiotherapy ranged from 30% [18] to 100% [19]. The reported previous lines (median) of systemic therapy for advanced or metastatic disease ranged from one line [19] to five or more lines of therapy [15, 21, 27], with 2–4 previous lines of therapy being the most commonly reported [16, 17, 26, 29,30,31].

Articles in this review reported on adverse drug reactions for currently approved or investigational anti-HER2 therapies. The approved therapies include trastuzumab combination therapy, T-DM1, T-DXd (approved in the US), and lapatinib combination therapy. Trastuzumab duocarmazine was the only investigational therapy. Patient enrollment was conducted during 2001–2017 for trastuzumab studies, up to 2008 for lapatinib studies, up to 2014 for T-DM1 studies, 2015–2018 for T-DXd studies, and 2014–2018 for the trastuzumab duocarmazine study.

Drug-induced ILD incidence and severity

A summary of drug-induced ILD incidence and severity reported in each study is presented in Table 2. A summary of drug-induced ILD incidence and severity by anti-HER2 therapy, including trastuzumab, lapatinib, T-DM1, T-DXd, and trastuzumab duocarmazine is provided in Table S-2 (Supplementary Material).

Table 2 Summary of the incidence and severity of drug-induced ILD in patients with HER2-positive metastatic breast cancer who received anti-HER2 therapy


Eight studies reported incidence and severity of drug-induced ILD in a total of 1,642 patients receiving trastuzumab therapy; of these patients, 162 (9.9%) had a reported ILD event. Overall, there were 3 (0.2%) ILD-related deaths among those receiving trastuzumab therapy. Two trastuzumab studies reported at least one case of specifically ILD [19, 22]. Seven trastuzumab studies reported at least one case of pneumonitis [17,18,19, 22,23,24, 28], of which six studies reported at least one case of grade 3 or higher pneumonitis and one study reported grade 1–2 pneumonitis cases related to radiotherapy [18]. Four studies assessed patients who received trastuzumab combined with an mTOR inhibitor, including everolimus [19, 22, 23] and sirolimus [17]. One study reported an ILD incidence of 9.2% (n = 26) among patients who received trastuzumab for 25.1 weeks (median) combined with vinorelbine and everolimus; the ILD incidence was lower in the comparator arm (n = 11 [3.9%]), which received trastuzumab for 24.0 weeks (median) combined with vinorelbine and placebo instead of everolimus; however, compared with the everolimus arm, a similar proportion of patients in the comparator arm (n = 5 [1.8%]) were diagnosed with grade 3 or 4 ILD [19]. Other studies with patients receiving trastuzumab combined with vinorelbine, either alone for 4.7 months (median) [32] or combined with docetaxel (a taxane chemotherapeutic agent) and dexamethasone (a corticosteroid) for 11 months (median) [24], reported a lower ILD incidence (n = 0 [0%] and n = 2 [3.3%], respectively) than studies with patients who received trastuzumab combined with an mTOR inhibitor.


Four studies reported on a total of 4,470 patients who received lapatinib, a dual epidermal growth factor receptor/HER2 tyrosine kinase inhibitor; eight of these patients (0.2%) had at least one reported ILD event. The earliest of these studies reported no ILD cases among patients who received lapatinib for 8.4 weeks (median) [31]. An expanded access study conducted in 45 countries (sample size, n = 4,283) [20] and a phase 3 study conducted in China (sample size, n = 52) [30] reported an ILD incidence of 0.2% (n = 7) and 0.0% (no cases), respectively, among patients who received lapatinib, combined with capecitabine, for 24.7 and 24.3 weeks (median), respectively. Among all studies that assessed lapatinib-based therapies, the highest ILD incidence (1.8%, consisting of one case of pulmonary fibrosis) was reported in a phase 2 study (sample size, n = 57) conducted in eastern Europe among patients who received lapatinib combined with paclitaxel for 45 weeks (median) [25].

Trastuzumab emtansine

Three studies reported on 3,290 patients who received T-DM1, an antibody–drug conjugate that contains the trastuzumab monoclonal antibody bound to the cytotoxic agent DM1, with a treatment duration ranging from 4.2 to 6.3 months (median) [21, 26, 29]. Across these studies, 15 patients (0.5%) had a reported ILD event, and 6 patients (0.2%) had an ILD-related death. Dieras et al. (sample size, n = 884) reported the highest ILD incidence (pneumonitis, n = 10 [1.1%]), including 2 patients (0.2%) with grade 3–4 pneumonitis and one pneumonitis-related death (0.1%) [21]. Both Krop et al. (sample size, n = 404) and Montemurro et al. (sample size, n = 2,002) only reported deaths related to ILD, both with an incidence of 0.2% (n = 1 and n = 4, respectively) [26, 29].

Trastuzumab deruxtecan

T-DXd is a HER2-targeted antibody–drug conjugate composed of a humanized monoclonal antibody with the same amino acid sequence as trastuzumab, a cleavable tetrapeptide-based linker, and a potent topoisomerase I inhibitor payload [33,34,35]. A phase 1 study enrolled 115 patients (dose-expansion phase) from Japan (n = 62 [54%]) and the US (n = 53 [46%]) who received T-DXd for 8.3 months (median) and reported an ILD incidence of 17.4% (n = 20; grade 1–2, n = 17 [incidence, 14.8%]; grade 3, n = 1 [incidence, 0.9%]; no grade 4; deaths, n = 2 [incidence, 1.7%]), including cases of pneumonitis (n = 8), specifically ILD (n = 6), and organizing pneumonia (n = 6) [27]. The phase 2 study assessed 184 patients enrolled from North America (n = 53 [28.8%]), Asia (n = 63 [34.2%]), and Europe (n = n = 68 [37.0%]) who received T-DXd for 10.0 months (median) [15]. Twenty-five patients (13.6%) had a treatment-related ILD event, most of which were grade 1–2 (n = 20 [incidence, 10.9%]), one grade 3 (incidence, 0.5%), no grade 4, and four ILD-related deaths (incidence, 2.2%).

Trastuzumab duocarmazine

Trastuzumab duocarmazine is a HER2-targeted antibody–drug conjugate composed of trastuzumab bound to a linker drug containing duocarmycin. One phase 1 study reported on ILD among patients with either MBC (n = 99 [67.8%] in the dose-expansion phase), gastric cancer, urothelial cancer, or endometrial cancer and receiving trastuzumab duocarmazine for 3.5 months (median) [16]. The study included a dose-escalation phase (sample size, n = 39) and a dose-expansion phase (sample size, n = 146) and reported three cases of pneumonitis (7.7%, all grade 1–2) in the dose-escalation phase and one pneumonitis-related death (0.7%) in the dose-expansion phase.

ILD severity by line of therapy for advanced disease

Across all studies, the incidence of any-grade ILD was similar between patients who received an anti-HER2 drug as first-line therapy (3.6% [n = 5]) versus later line therapy (2.3% [n = 229]) (Table S-3, Supplementary Material). While studies reporting on patients who received an anti-HER2 drug as first-line therapy reported no ILD-related deaths, studies assessing later line therapy reported a 0.2% incidence of ILD-related death (n = 16, including ILD [n = 5 (< 0.1%)], pneumonitis [n = 10 (0.1%)], and pulmonary fibrosis [n = 1 (< 0.1%)]); however, among the studies included in this review, more patients received anti-HER2 therapy as later line therapy (n = 9,749) than as first-line therapy (n = 140).

Among patients who received an anti-HER2 drug as first-line therapy for advanced MBC, the ILD incidence was 1.8% (n = 1) [25], 3.3% (n = 2) [24], and 8.7% (n = 2) [18] across the three studies reporting on patients receiving lapatinib-based therapy for 10.4 months (median), trastuzumab-based therapy for 11 months (median), or trastuzumab-based therapy for 12.4 months (median) combined with pertuzumab for 11.3 months (median) and radiotherapy, respectively. In studies reporting only on patients who previously received systemic therapy for advanced MBC, the ILD incidence was as low as 0% among patients receiving lapatinib alone for 1.9 months (median) as later line therapy [31] and as high as 21.4% (n = 101) among patients receiving trastuzumab combined with paclitaxel and everolimus as later line therapy (treatment duration not reported) [22]. Among patients who received T-DM1 for 4.2 months (median) as later line therapy, only one case (0.2%) of pneumonitis was reported, which resulted in death [26]. Four studies reported on patients receiving either first-line or later line therapy for advanced or metastatic disease, with the majority of patients receiving later line therapy (range 58–84%) across the studies [19, 21, 29, 32].

Monitoring and management of ILD

None of the studies in this review reported on specific guidelines for monitoring for ILD before an ILD diagnosis among patients receiving anti-HER2 therapies. However, 10 of the 18 studies (55.6%) indicated that ILD-related events were managed via dose interruption, dose reduction, or treatment discontinuation [15,16,17, 22, 23, 25,26,27,28, 30]. The most common approaches included dose interruption and reduction for grades 2 and 3 and treatment discontinuation (often until the improvement of the ILD condition) for grades 3 and 4.

Two studies in this review provided detailed guidelines for management of drug-induced ILD. In a phase 2 clinical trial of T-DXd, Modi et al. [15] recommend T-DXd dose interruption and possible systemic steroids for grade 1 events, and permanent T-DXd discontinuation with prompt initiation of systemic steroids for grade 2, 3, or 4 events; hospitalization is required for grade 3 or 4 events. In contrast, in a phase 3 clinical trial of trastuzumab combined with paclitaxel and either everolimus or placebo, Hurvitz et al. [22] recommend no specific treatment for grade 1 events, everolimus dose reduction and paclitaxel dose interruption for grade 2 events, additional dose interruption of everolimus and trastuzumab for grade 3 events, and treatment discontinuation for grade 4 events; corticosteroids are recommended for grades 2, 3, or 4 events.


Drug-induced ILD has been reported among patients with HER2-positive MBC receiving anti-HER2 therapies, including trastuzumab, lapatinib, T-DM1, T-DXd, and trastuzumab duocarmazine. The highest ILD incidence was reported in patients who received trastuzumab combined with an mTOR inhibitor (everolimus [range 7.3–21.4%] or sirolimus [9.1%]), and in patients who received T-DXd (range 13.6–17.4%). The incidence of ILD-related deaths was highest among patients receiving T-DXd (range 1.7–2.2%), whereas in patients receiving trastuzumab, lapatinib, T-DM1, or trastuzumab duocarmazine, the incidence was lower (range 0.1–0.6%). The elevated incidence of drug-induced ILD among those who received an mTOR inhibitor combined with trastuzumab is consistent with previous studies demonstrating associations between mTOR inhibitors and ILD among cancer patients [10, 36]. The lowest incidence of drug-induced ILD was among patients who received lapatinib-based therapy (range 0–1.8%) or T-DM1 (range 0.2–1.1%).

Disease management guidelines for drug-induced ILD were provided in two studies in this review: one on managing ILD induced by T-DXd [15] and the other on ILD induced by trastuzumab combined with paclitaxel and everolimus [22]. The guidance provided by these two studies differs, as they were conducted in the context of two different anti-HER2 treatment regimens. The guidelines for trastuzumab in combination with paclitaxel and everolimus are consistent with the pneumonitis management guidance provided in the everolimus prescribing information [37], both recommending everolimus dose reduction and/or interruption for grade 2 or 3 events, but no change in treatment regimen for grade 1. The guidelines for T-DXd-induced ILD recommend T-DXd dose interruption for grade 1 and permanent T-DXd treatment discontinuation for patients with grade 2, 3, or 4, which is similar to the management recommendations for drug-induced lung injuries in Kubo et al. [13] and for pneumonitis induced by immune checkpoint inhibitors in the American Society of Clinical Oncology Practice Guideline [38]. The clinical significance of an ILD diagnosis together with the relatively high incidence of ILD induced by some anti-HER2 therapies highlights the need for consensus in ILD monitoring and management guidelines in the context of anticancer treatment for metastatic disease.

There are limitations associated with this review. The search was limited to the past 10 years and to English-language articles only. Additionally, studies reporting on ILD using a diagnosis term other than those prespecified in the inclusion criteria may have been excluded. Lastly, there was no quality assessment of the included studies (e.g., respiratory failure). However, a quality assessment of included studies was not necessary to accomplish the primary study objective of reporting on the incidence of ILD as an adverse drug reaction in the context of a clinical trial or observational study.


ILD is a well-described adverse drug reaction associated with anti-HER2 therapies, with the highest ILD incidence reported among patients receiving trastuzumab and everolimus combination therapy. Drug-induced ILD is typically managed via dose reduction, dose interruption, or treatment discontinuation; however, detailed ILD management guidelines are available for only two anti-HER2 treatment regimens (i.e., T-DXd and trastuzumab combined with paclitaxel and either everolimus or placebo), necessitating the development of standard guidelines across all anti-HER2 therapies for MBC. The dearth of published ILD monitoring approaches in the context of HER2-positive MBC and anti-HER2 therapy highlights the need to identify risk factors and the underlying etiology of ILD to develop effective strategies for monitoring for ILD among these patients.

Data availability

All data generated or analyzed during this study are included in this published article and its supplementary information files.


  1. 1.

    Howlader N, Altekruse SF, Li CI, Chen VW, Clarke CA, Ries LA, Cronin KA (2014) US incidence of breast cancer subtypes defined by joint hormone receptor and HER2 status. J Natl Cancer Inst.

    Article  PubMed  PubMed Central  Google Scholar 

  2. 2.

    Goddard KA, Weinmann S, Richert-Boe K, Chen C, Bulkley J, Wax C (2012) HER2 evaluation and its impact on breast cancer treatment decisions. Public Health Genomics 15(1):1–10.

    CAS  Article  PubMed  Google Scholar 

  3. 3.

    US Food and Drug Administration (2018) Herceptin prescribing information.

  4. 4.

    US Food and Drug Administration (2019) Kadcyla prescribing information.

  5. 5.

    US Food and Drug Administration (2017) Nerlynx prescribing information.

  6. 6.

    US Food and Drug Administration (2018) Perjeta prescribing information.

  7. 7.

    US Food and Drug Administration (2018) Tykerb prescribing information.

  8. 8.

    Sears CR, Peikert T, Possick JD, Naidoo J, Nishino M, Patel SP, Camus P, Gaga M, Garon EB, Gould MK, Limper AH, Montgrain PR, Travis WD, Rivera MP (2019) Knowledge gaps and research priorities in immune checkpoint inhibitor-related pneumonitis: an official American Thoracic Society research statement. Am J Respir Crit Care Med 200(6):e31–e43.

    CAS  Article  PubMed  Google Scholar 

  9. 9.

    US Food and Drug Administration (2019) FDA warns about rare but severe lung inflammation with Ibrance, Kisqali, and Verzenio for breast cancer. Accessed October 15, 2019

  10. 10.

    Willemsen AE, Grutters JC, Gerritsen WR, van Erp NP, van Herpen CM, Tol J (2016) mTOR inhibitor-induced interstitial lung disease in cancer patients: comprehensive review and a practical management algorithm. Int J Cancer 138(10):2312–2321.

    CAS  Article  PubMed  Google Scholar 

  11. 11.

    American Thoracic Society (2010) Interstitial lung disease. In: Schraufnagel DE (ed) Breathing in America: disease, progress, and hope

  12. 12.

    Meyer KC (2014) Diagnosis and management of interstitial lung disease. Transl Respir Med 2:4.

    Article  PubMed  PubMed Central  Google Scholar 

  13. 13.

    Kubo K, Azuma A, Kanazawa M, Kameda H, Kusumoto M, Genma A, Saijo Y, Sakai F, Sugiyama Y, Tatsumi K, Dohi M, Tokuda H, Hashimoto S, Hattori N, Hanaoka M, Fukuda Y, Japanese Respiratory Society Committee for formulation of Consensus statement for the diagnosis, treatment of drug-induced lung injuries (2013) Consensus statement for the diagnosis and treatment of drug-induced lung injuries. Respir Investig 51(4):260–277.

    Article  PubMed  Google Scholar 

  14. 14.

    Wells AU, Hirani N (2008) Interstitial lung disease guideline. Thorax 63(Suppl 5):v1–v58.

    Article  PubMed  Google Scholar 

  15. 15.

    Modi S, Saura C, Yamashita T, Park YH, Kim SB, Tamura K, Andre F, Iwata H, Ito Y, Tsurutani J, Sohn J, Denduluri N, Perrin C, Aogi K, Tokunaga E, Im SA, Lee KS, Hurvitz SA, Cortes J, Lee C, Chen S, Zhang L, Shahidi J, Yver A, Krop I, Investigators DE-B (2019) Trastuzumab deruxtecan in previously treated HER2-positive breast cancer. New Engl J Med.

    Article  PubMed  Google Scholar 

  16. 16.

    Banerji U, van Herpen CML, Saura C, Thistlethwaite F, Lord S, Moreno V, Macpherson IR, Boni V, Rolfo C, de Vries EGE, Rottey S, Geenen J, Eskens F, Gil-Martin M, Mommers EC, Koper NP, Aftimos P (2019) Trastuzumab duocarmazine in locally advanced and metastatic solid tumours and HER2-expressing breast cancer: a phase 1 dose-escalation and dose-expansion study. Lancet Oncol 20(8):1124–1135.

    CAS  Article  PubMed  Google Scholar 

  17. 17.

    Acevedo-Gadea C, Hatzis C, Chung G, Fishbach N, Lezon-Geyda K, Zelterman D, DiGiovanna MP, Harris L, Abu-Khalaf MM (2015) Sirolimus and trastuzumab combination therapy for HER2-positive metastatic breast cancer after progression on prior trastuzumab therapy. Breast Cancer Res Treat 150(1):157–167.

    CAS  Article  PubMed  Google Scholar 

  18. 18.

    Ajgal Z, de Percin S, Dieras V, Pierga JY, Campana F, Fourquet A, Kirova YM (2017) Combination of radiotherapy and double blockade HER2 with pertuzumab and trastuzumab for HER2-positive metastatic or locally recurrent unresectable and/or metastatic breast cancer: assessment of early toxicity. Cancer Radiother 21(2):114–118.

    CAS  Article  PubMed  Google Scholar 

  19. 19.

    Andre F, O'Regan R, Ozguroglu M, Toi M, Xu B, Jerusalem G, Masuda N, Wilks S, Arena F, Isaacs C, Yap YS, Papai Z, Lang I, Armstrong A, Lerzo G, White M, Shen K, Litton J, Chen D, Zhang Y, Ali S, Taran T, Gianni L (2014) Everolimus for women with trastuzumab-resistant, HER2-positive, advanced breast cancer (BOLERO-3): a randomised, double-blind, placebo-controlled phase 3 trial. Lancet Oncol 15(6):580–591.

    CAS  Article  PubMed  Google Scholar 

  20. 20.

    Capri G, Chang J, Chen SC, Conte P, Cwiertka K, Jerusalem G, Jiang Z, Johnston S, Kaufman B, Link J, Ro J, Schutte J, Oliva C, Parikh R, Preston A, Rosenlund J, Selzer M, Zembryki D, De Placido S (2010) An open-label expanded access study of lapatinib and capecitabine in patients with HER2-overexpressing locally advanced or metastatic breast cancer. Ann Oncol 21(3):474–480.

    CAS  Article  PubMed  Google Scholar 

  21. 21.

    Dieras V, Harbeck N, Budd GT, Greenson JK, Guardino AE, Samant M, Chernyukhin N, Smitt MC, Krop IE (2014) Trastuzumab emtansine in human epidermal growth factor receptor 2-positive metastatic breast cancer: an integrated safety analysis. J Clin Oncol 32(25):2750–2757.

    CAS  Article  PubMed  Google Scholar 

  22. 22.

    Hurvitz SA, Andre F, Jiang Z, Shao Z, Mano MS, Neciosup SP, Tseng LM, Zhang Q, Shen K, Liu D, Dreosti LM, Burris HA, Toi M, Buyse ME, Cabaribere D, Lindsay MA, Rao S, Pacaud LB, Taran T, Slamon D (2015) Combination of everolimus with trastuzumab plus paclitaxel as first-line treatment for patients with HER2-positive advanced breast cancer (BOLERO-1): a phase 3, randomised, double-blind, multicentre trial. Lancet Oncol 16(7):816–829.

    CAS  Article  PubMed  Google Scholar 

  23. 23.

    Hurvitz SA, Dalenc F, Campone M, O'Regan RM, Tjan-Heijnen VC, Gligorov J, Llombart A, Jhangiani H, Mirshahidi HR, Tan-Chiu E, Miao S, El-Hashimy M, Lincy J, Taran T, Soria JC, Sahmoud T, Andre F (2013) A phase 2 study of everolimus combined with trastuzumab and paclitaxel in patients with HER2-overexpressing advanced breast cancer that progressed during prior trastuzumab and taxane therapy. Breast Cancer Res Treat 141(3):437–446.

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  24. 24.

    Infante JR, Yardley DA, Burris HA 3rd, Greco FA, Farley CP, Webb C, Spigel DR, Hainsworth JD (2009) Phase II trial of weekly docetaxel, vinorelbine, and trastuzumab in the first-line treatment of patients with HER2-positive metastatic breast cancer. Clin Breast Cancer 9(1):23–28.

    CAS  Article  PubMed  Google Scholar 

  25. 25.

    Jagiello-Gruszfeld A, Tjulandin S, Dobrovolskaya N, Manikhas A, Pienkowski T, DeSilvio M, Ridderheim M, Abbey R (2010) A single-arm phase II trial of first-line paclitaxel in combination with lapatinib in HER2-overexpressing metastatic breast cancer. Oncology 79(1–2):129–135.

    CAS  Article  PubMed  Google Scholar 

  26. 26.

    Krop IE, Kim SB, Gonzalez-Martin A, LoRusso PM, Ferrero JM, Smitt M, Yu R, Leung AC, Wildiers H, TRs Collaborators (2014) Trastuzumab emtansine versus treatment of physician's choice for pretreated HER2-positive advanced breast cancer (TH3RESA): a randomised, open-label, phase 3 trial. Lancet Oncol 15(7):689–699.

    CAS  Article  PubMed  Google Scholar 

  27. 27.

    Tamura K, Tsurutani J, Takahashi S, Iwata H, Krop IE, Redfern C, Sagara Y, Doi T, Park H, Murthy RK, Redman RA, Jikoh T, Lee C, Sugihara M, Shahidi J, Yver A, Modi S (2019) Trastuzumab deruxtecan (DS-8201a) in patients with advanced HER2-positive breast cancer previously treated with trastuzumab emtansine: a dose-expansion, phase 1 study. Lancet Oncol 20(6):816–826.

    CAS  Article  PubMed  Google Scholar 

  28. 28.

    Loi S, Giobbie-Hurder A, Gombos A, Bachelot T, Hui R, Curigliano G, Campone M, Biganzoli L, Bonnefoi H, Jerusalem G, Bartsch R, Rabaglio-Poretti M, Kammler R, Maibach R, Smyth MJ, Di Leo A, Colleoni M, Viale G, Regan MM, Andre F, International Breast Cancer Study G, the Breast International G (2019) Pembrolizumab plus trastuzumab in trastuzumab-resistant, advanced, HER2-positive breast cancer (PANACEA): a single-arm, multicentre, phase 1b–2 trial. Lancet Oncol 20(3):371–382.

    Article  Google Scholar 

  29. 29.

    Montemurro F, Ellis P, Anton A, Wuerstlein R, Delaloge S, Bonneterre J, Quenel-Tueux N, Linn SC, Irahara N, Donica M, Lindegger N, Barrios CH (2019) Safety of trastuzumab emtansine (T-DM1) in patients with HER2-positive advanced breast cancer: primary results from the KAMILLA study cohort 1. Eur J Cancer 109:92–102.

    CAS  Article  PubMed  Google Scholar 

  30. 30.

    Xu BH, Jiang ZF, Chua D, Shao ZM, Luo RC, Wang XJ, Liu DG, Yeo W, Yu SY, Newstat B, Preston A, Martin AM, Chi HD, Wang L (2011) Lapatinib plus capecitabine in treating HER2-positive advanced breast cancer: efficacy, safety, and biomarker results from Chinese patients. Chin J Cancer 30(5):327–335

    CAS  Article  Google Scholar 

  31. 31.

    Blackwell KL, Pegram MD, Tan-Chiu E, Schwartzberg LS, Arbushites MC, Maltzman JD, Forster JK, Rubin SD, Stein SH, Burstein HJ (2009) Single-agent lapatinib for HER2-overexpressing advanced or metastatic breast cancer that progressed on first- or second-line trastuzumab-containing regimens. Ann Oncol 20(6):1026–1031.

    CAS  Article  PubMed  Google Scholar 

  32. 32.

    Harbeck N, Huang CS, Hurvitz S, Yeh DC, Shao Z, Im SA, Jung KH, Shen K, Ro J, Jassem J, Zhang Q, Im YH, Wojtukiewicz M, Sun Q, Chen SC, Goeldner RG, Uttenreuther-Fischer M, Xu B, Piccart-Gebhart M, LU-Bs Group (2016) Afatinib plus vinorelbine versus trastuzumab plus vinorelbine in patients with HER2-overexpressing metastatic breast cancer who had progressed on one previous trastuzumab treatment (LUX-Breast 1): an open-label, randomised, phase 3 trial. Lancet Oncol 17(3):357–366.

    CAS  Article  PubMed  Google Scholar 

  33. 33.

    Ogitani Y, Hagihara K, Oitate M, Naito H, Agatsuma T (2016) Bystander killing effect of DS-8201a, a novel anti-human epidermal growth factor receptor 2 antibody-drug conjugate, in tumors with human epidermal growth factor receptor 2 heterogeneity. Cancer Sci 107(7):1039–1046.

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  34. 34.

    Nakada T, Sugihara K, Jikoh T, Abe Y, Agatsuma T (2019) The latest research and development into the antibody-drug conjugate, [fam-] trastuzumab deruxtecan (DS-8201a), for HER2 cancer therapy. Chem Pharm Bull 67(3):173–185.

    CAS  Article  PubMed  Google Scholar 

  35. 35.

    Ogitani Y, Aida T, Hagihara K, Yamaguchi J, Ishii C, Harada N, Soma M, Okamoto H, Oitate M, Arakawa S, Hirai T, Atsumi R, Nakada T, Hayakawa I, Abe Y, Agatsuma T (2016) DS-8201a, a novel HER2-Targeting ADC with a novel DNA topoisomerase i inhibitor, demonstrates a promising antitumor efficacy with differentiation from T-DM1. Clin Cancer Res 22(20):5097–5108.

    CAS  Article  PubMed  Google Scholar 

  36. 36.

    Skeoch S, Weatherley N, Swift AJ, Oldroyd A, Johns C, Hayton C, Giollo A, Wild JM, Waterton JC, Buch M, Linton K, Bruce IN, Leonard C, Bianchi S, Chaudhuri N (2018) Drug-induced interstitial lung disease: a systematic review. J Clin Med.

    Article  PubMed  PubMed Central  Google Scholar 

  37. 37.

    Afinitor prescribing information (2018),203985s013lbl.pdf

  38. 38.

    Brahmer JR, Lacchetti C, Schneider BJ, Atkins MB, Brassil KJ, Caterino JM, Chau I, Ernstoff MS, Gardner JM, Ginex P, Hallmeyer S, Holter Chakrabarty J, Leighl NB, Mammen JS, McDermott DF, Naing A, Nastoupil LJ, Phillips T, Porter LD, Puzanov I, Reichner CA, Santomasso BD, Seigel C, Spira A, Suarez-Almazor ME, Wang Y, Weber JS, Wolchok JD, Thompson JA, National Comprehensive Cancer N (2018) Management of immune-related adverse events in patients treated with immune checkpoint inhibitor therapy: American Society of Clinical Oncology Clinical Practice Guideline. J Clin Oncol 36(17):1714–1768.

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  39. 39.

    ICH (1994) Clinical safety data management: definitions and standards for expedited reporting E2A.

  40. 40.

    NCI (2017) Common terminology criteria for adverse events (CTCAE), version 5.0.

Download references


The authors thank Brian Samsell of RTI Health Solutions for medical writing assistance.


Financial support for the study was provided by Daiichi Sankyo, Inc. RTI Health Solutions received funding under a research contract with Daiichi Sankyo, Inc. to conduct this study and provide editorial support in the form of manuscript writing, styling, and submission.

Author information




MDH, HED, JS, MER, and AL made substantial contributions to the conception or design of the work. All authors made substantial contributions to the acquisition, analysis, or interpretation of data for the work. All authors contributed to drafting the work or revising it critically for important intellectual content.

Corresponding author

Correspondence to Michelle D. Hackshaw.

Ethics declarations

Conflicts of interest

MDH, JS, and CT are Daiichi Sankyo, Inc. employees. HED, AL, and MER are employees of RTI Health Solutions, an independent nonprofit research organization that performs contracted project work for medical device and pharmaceutical companies. DRC, HI, and CAP are consultants for Daiichi Sankyo, Inc. but have received no compensation for their contributions to this article.

Ethics approval

Not applicable for a literature review.

Informed consent

Not applicable for a literature review.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary file1 (DOCX 29 kb)

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Hackshaw, M.D., Danysh, H.E., Singh, J. et al. Incidence of pneumonitis/interstitial lung disease induced by HER2-targeting therapy for HER2-positive metastatic breast cancer. Breast Cancer Res Treat (2020).

Download citation


  • Metastatic breast cancer
  • HER2 positive
  • Interstitial lung disease
  • HER2-targeting therapy
  • Trastuzumab
  • Lapatinib
  • Trastuzumab emtansine
  • Trastuzumab deruxtecan
  • Trastuzumab duocarmazine