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. 2018 Jan 23;176(3):597–608. doi: 10.1002/ajmg.a.38603

Benign and malignant tumors in Rubinstein–Taybi syndrome

Max V Boot 1, Martine J van Belzen 2, Lucy I Overbeek 3, Nathalie Hijmering 1, Matias Mendeville 1, Quinten Waisfisz 4, Pieter Wesseling 1,5, Raoul C Hennekam 6,✉, Daphne de Jong 1
PMCID: PMC5838508  PMID: 29359884

Abstract

Rubinstein–Taybi syndrome (RSTS) is a multiple congenital anomalies syndrome associated with mutations in CREBBP (70%) and EP300 (5–10%). Previous reports have suggested an increased incidence of specific benign and possibly also malignant tumors. We identified all known individuals diagnosed with RSTS in the Netherlands until 2015 (n = 87) and studied the incidence and character of neoplastic tumors in relation to their CREBBP/EP300 alterations. The population–based Dutch RSTS data are compared to similar data of the Dutch general population and to an overview of case reports and series of all RSTS individuals with tumors reported in the literature to date. Using the Nationwide Network and Registry of Histopathology and Cytopathology in the Netherlands (PALGA Foundation), 35 benign and malignant tumors were observed in 26/87 individuals. Meningiomas and pilomatricomas were the most frequent benign tumors and their incidence was significantly elevated in comparison to the general Dutch population. Five malignant tumors were observed in four persons with RSTS (medulloblastoma; diffuse large‐cell B‐cell lymphoma; breast cancer; non‐small cell lung carcinoma; colon carcinoma). No clear genotype–phenotype correlation became evident. The Dutch population‐based data and reported case studies underscore the increased incidence of meningiomas and pilomatricomas in individuals with RSTS. There is no supporting evidence for an increased risk for malignant tumors in individuals with RSTS, however, due to the small numbers this risk may not be fully dismissed.

Keywords: CREBBP, diffuse large B‐cell lymphoma, EP300, meningioma, neoplasia, Rubinstein–Taybi syndrome

1. INTRODUCTION

Rubinstein–Taybi syndrome (RSTS) is a congenital disorder characterized by intellectual disability, unusual behavior, postnatal growth retardation, and multiple congenital anomalies, especially of the face and distal limbs (Rubinstein & Taybi, 1963). The birth prevalence of RSTS is 1:100,000 to 1:125,000 (Hennekam, 2006). RSTS is caused by a heterozygous mutation in the gene encoding the transcriptional co‐activator CREB‐binding protein (CREBBP) on chromosome 16p13.3 in about 60% of affected individuals (Petrij et al., 1995), a submicroscopic deletion at 16p13.3 in about 10% of individuals (Hennekam, 2006), or a mutation of the gene E1A binding protein p300 (EP300) on chromosome 22q13.2 in about 5–10% of individuals (Fergelot et al., 2016; Roelfsema et al., 2005). In the remaining RSTS individuals, no specific genetic alterations can be detected and the diagnosis is based on the combination of clinical manifestations only. Most mutations occur de novo although vertical transmission of mutations has been described (Hennekam, 2006).

CREBBP and EP300 are closely related proteins belonging to the K‐acetyltransferase‐3 (KAT3) family of histone/protein lysine acetyltransferases, which serve as transcriptional co‐activators for a large number of DNA‐binding transcription factors that mediate multiple signaling and developmental pathways (Wang et al., 2010). Mutations in CREBBP and EP300 have been demonstrated in various benign and malignant tumors, including in up to 40% of diffuse large cell B‐cell lymphoma (DLBCL) and follicular lymphoma cases (Lohr et al., 2012; Morin et al., 2011; Pasqualucci et al., 2011; Zhang et al., 2011). A specific type of acute myeloid leukemia is associated with a chromosomal translocation involving CREBBP (Rozman et al., 2004).

Various benign and malignant tumors have been described in RSTS individuals. In 1989, Siraganian, Rubinstein, and Miller (1989) reported a series of 574 RSTS individuals in whom 22 tumors were detected in 19 persons (3.3%). Nine were malignant, 13 were benign, and 79% occurred under the age of 20. Miller and Rubinstein (1995) expanded the above series and reported 36 tumors in 725 RSTS individuals (5%). Tumors of the central nervous system and of hematological origin were relatively frequently reported (12 and 6 of 36 neoplasms, respectively) and two individuals with pilomatricomas were noted. For both studies, molecular confirmation of RSTS was not yet possible at the time of publication, preventing genotype–phenotype studies. Genotype–phenotype studies have not been performed in subsequent reports either. The data in these series were composed of cases reported in literature and cases reported to Dr Jack Rubinstein (Miller & Rubinstein, 1995; Siraganian et al., 1989).

Individuals with RSTS are prone to develop excessive scar tissue (keloids). In 24% of RSTS individuals, itching keloids develop during puberty and adulthood (van de Kar et al., 2014). It has been suggested that, similarly to other neoplastic processes, keloids in RSTS individuals may also be a result of deregulated proliferation of fibroblasts and thereby may serve as a model to study in those individuals the earliest oncogenic changes (Siraganian et al., 1989; van de Kar et al., 2014).

Here, we report the results of a study on the incidence of benign and malignant tumors and on possible genotype–phenotype correlations in a nation‐wide, population‐based study covering all known RSTS individuals in the Netherlands between 1986 and 2015. The results are compared to an overview of all reported tumors in individuals with RSTS in the literature to date.

2. MATERIALS AND METHODS

2.1. Study population

In the Netherlands, individuals diagnosed with RSTS are identified with an almost complete coverage, as most families with a child with RSTS become member of the dedicated support group (Stichting RSTS) and until 2010 all molecular diagnostics for RSTS have been performed in a single laboratory (Leiden University Medical Centre). Furthermore, affected individuals and their families are almost invariably seen in the expertise clinic for individuals with RSTS led one of the authors (RCH). All families known to either of these sources were contacted and informed consent was obtained for all individuals with RSTS in the present study. The characteristics of all participants, including results of physical exams and presence of keloids, had been obtained during various, typically repeated exams of all individuals by one of the authors (RCH). The study, including linkage of name, sex, and date of birth via a “Trusted Third Partner” to PALGA, has been approved by the Medical Ethical Committee of the Academic Medical Centre in Amsterdam (NL33011.018.11).

2.2. PALGA database search for benign and malignant tumors in individuals with RSTS

Since 1985, all pathology reports are centrally archived in the nationwide network and registry of histopathology and cytopathology in the Netherlands (PALGA), with a nationwide coverage of all academic and non‐academic hospitals since 1990 (Casparie et al., 2007). Standardized coding allows for comprehensive searches for specific and detailed diagnoses and patient cohorts, while still compliant to current privacy regulations.

Using the name, sex, and date of birth, all histopathological and cytological pathology registrations of all known RSTS individuals were retrieved from the PALGA database. To identify relevant diagnoses that may not be diagnosed by histopathological or cytological examination, and therefore may not be registered in PALGA (e.g., acute leukemia), the database of the Netherlands Cancer Registry was searched using the same strategy. Medical data, including results of physical exams and presence of keloids, were retrieved from the files of one of the authors (RCH). Benign and malignant tumors were defined as described by Willis (1952).

All relevant pathology slides were retrieved from the original pathology laboratories and reviewed by two experienced pathologists (PW, DDJ). Presence of keloid lesions was assessed predominantly on clinical grounds, as described elsewhere (van de Kar et al., 2014) and histologically confirmed if reported in the PALGA database.

All available genotype data for both CREBBP and EP300 mutations were obtained from the original diagnostic laboratories. All molecular studies had been performed as part of routine clinical work‐up, no additional molecular studies were performed specifically for the present study. Only individuals with a proven variant in CREBBP or EP300 were included in analysis.

2.3. Literature review of benign and malignant tumors in individuals with RSTS

A PubMed search was performed using the queries “Rubinstein–Taybi syndrome,” “Rubinstein–Taybi syndrome,” “Rubinstein–Taybi,” and “Rubinstein–Taybi” as to cover all publications on RSTS. All retrieved publications, including individual case reports and case series, were scanned for tumors. The references in the publications were hand‐searched for further publications. Publications in other languages than English were excluded. There were no other exclusion criteria.

3. RESULTS

3.1. Benign and malignant tumors in individuals with RSTS in the Netherlands

Between 1986 and 2015, 87 persons (37 male, 50 female), have been clinically diagnosed with RSTS in the Netherlands. Characteristics of the affected individuals with known mutation data are listed in Table 1; further details of all RSTS individuals are provided in Supplementary Table S1.

Table 1.

Overview of tumors detected between 1986 and 2015 in individuals with molecularly confirmed RSTS in the Netherlands

Age at time of present study Sex Neoplasm Age at histopathological diagnosis Keloid Affected gene
Nonsense and frameshift mutation
6 M − CREBBP
8 F Pilomatricoma 4 + CREBBP
8 F − CREBBP
8 F − CREBBP
10 M − EP300
12 F + CREBBP
15 M n/a CREBBP
21 M Hemangioma 15 − CREBBP
23 M + CREBBP
27 F n/a CREBBP
31 M + CREBBP
40 F + CREBBP
46† M + CREBBP
56 M n/a CREBBP
57† M DLBCL 57 − CREBBP
59† F + CREBBP
59 M − CREBBP
65† F Meningioma Hemangioma 41 42 − CREBBP
Deletions and duplications
2 M n/a CREBBP
15 M − CREBBP
16 F Pilomatricoma 5 − CREBBP
16 F − CREBBP
19 M − CREBBP
22 M Pilomatricoma 2 − CREBBP
24 F Pilomatricoma 9 + CREBBP
30 M Pilomatricoma 14 + CREBBP
30 M Nevus Nevus 9 25 n/a CREBBP
30 F − CREBBP
34 F Pilomatricoma Pilomatricoma 6 15 + CREBBP
34† F Meningioma Breast carcinoma NSCLC 29 31 34 − CREBBP
40 F Pilomatricoma Pilomatricoma 19 37 − EP300
41 F n/a CREBBP
42† F Neuroma Dermatofibroma Meningioma Meningioma 29 32 36 37 − CREBBP
43† M − CREBBP
53 F Fibroadenoma of breast Meningioma 38 46 n/a CREBBP
Splice site mutation
10† M Medulloblastoma 9 − CREBBP
39 M Pilomatricoma 15 − CREBBP
40 M − CREBBP
52 F n/a CREBBP
59† M Colon carcinoma 58 + CREBBP
Missense mutation
23 F − EP300
46 F HSIL 49 + CREBBP
Mutation type unknown
2 F − EP300
21 F n/a CREBBP
30 F − EP300
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 †, Deceased; N/A, data not available; NSCLC, non‐small cell lung carcinoma; DLBCL, Diffuse large B‐cell lymphoma; HSIL, high grade squamous intra‐epithelial lesion of the cervix.

All RSTS diagnoses were confirmed based on clinical criteria by a single observer (RCH). Cytogenetic and/or molecular confirmation for CREBBP and EP300 has been performed only after this had become available in 1993 and 1995, respectively, and if indicated for patient care reasons and genetic counseling of family members. The median age at the time of our study was 31 years (range 2–69 years). At the time of the study 15 individuals were deceased, at a median age of 47.7 years (range 10.4–69.7 years).

For 51/87 clinically diagnosed RSTS individuals, histological and/or cytological assessments were recorded in the PALGA database. In total, 159 histological and cytological reports were retrieved in which 35 neoplastic tumor diagnoses were identified in 26 individuals with a maximum of four per person. All diagnoses were confirmed by review of the relevant pathology slides. Five malignant tumors were found in four persons (medulloblastoma, diffuse large cell B‐cell lymphoma, non‐small cell lung carcinoma, breast carcinoma, and colon carcinoma), and two individuals had a premalignant proliferation (both high‐grade squamous intraepithelial lesion of the cervix). Five meningiomas were found in four persons and 23 other, benign tumors were found in 18 individuals, almost exclusively benign cutaneous tumors. Tumors in molecularly confirmed RSTS individuals are listed in Table 1, tumors in all RSTS individuals are provided in Supplementary Table S1

Though the percentage of individuals with a malignant tumor was higher in specific age categories (Figure 1), numbers were too small to make a reliable comparison.

Figure 1.

Figure 1

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Cumulative incidence of malignant tumors and meningiomas in Dutch individuals with molecularly confirmed RSTS compared to that of the general Dutch population per age cohort. Blue, malignant tumors in the general Dutch population; green, malignant tumors in the Dutch RSTS population; orange, meningiomas in the Dutch RSTS population (Cumulative meningioma incidence is <0,1% in general Dutch population). Data on general population from www.cijfersoverkanker.nl (retrieved June, 2017). [Color figure can be viewed at wileyonlinelibrary.com]

3.2. Review of the literature

A PubMed search yielded 650 publications since the original report in 1963 (Rubinstein & Taybi, 1963). Fifty‐two papers contained data on additional individuals with RSTS with tumors and together these described 97 benign and malignant tumors in 89 individuals. This means that, including the present study, a total of 132 tumors have been reported in 115 individuals with RSTS. An overview of all reported tumors in RSTS is presented in Table 2.

Table 2.

Literature overview of tumors reported in individuals with RSTS (including present study)

Neoplasm Age Sex Affected gene Mutation Keloid Reference
Neurological
Medulloblastoma 4 M None found n/a + Bartsch et al. (2005)
Medulloblastoma 8 M n/a n/a n/a Bourdeaut et al. (2014)
Medulloblastoma 9 M CREBBP c.1941+3A>T − Present study
Medulloblastoma 8 M n/a n/a n/a Evans, Burnell, Campbell, Gattamaneni, and Birch (1993); Miller and Rubinstein (1995)
Medulloblastoma 9 M n/a n/a n/a Skousen et al. (1996)
Medulloblastoma 9 M n/a n/a n/a Miller and Rubinstein (1995)
Neuroblastoma 0 M CREBBP c.605dupC n/a de Kort, Conneman, and Diderich (2014)
Neuroblastoma 0 M n/a n/a n/a Miller and Rubinstein (1995)
Neuroblastoma 3 M n/a n/a n/a Siraganian et al. (1989)
Neuroblastoma 7 F n/a n/a n/a Ihara, Kuromaru, Takemoto, and Hara (1999)
Glioma n/a n/a n/a n/a n/a Lannering, Marky, and Nordborg (1990)
Glioma 2 F CREBBP c.4134G>T n/a Bartsch et al. (2010)
Glioma n/a M n/a n/a n/a Lannering et al. (1990)
Oligodendroglioma 2 F n/a n/a n/a Siraganian et al. (1989)
Neurilemmoma 13 M n/a n/a + Russell, Hoffman, and Bain (1971); Siraganian et al. (1989)
Neuroma 3 F CREBBP c.5838_5857dup n/a Tornese et al. (2015)
Neuromaf 29 F CREBBP Microdeletion 9‐31 − Present study
Pheochromocytoma 10 F n/a n/a n/a Bonioli and Bellini (1992); Miller and Rubinstein (1995)
Adrenocortical adenoma 22 F n/a n/a n/a Siraganian et al. (1989)
Pinealoma 14 M n/a n/a n/a Siraganian et al. (1989)
Pituitary adenoma 49 M n/a n/a n/a Miller and Rubinstein (1995)
Meningioma
Meningiomac 29 F CREBBP Microdeletion − Present study
Meningiomaf 36 F CREBBP Microdeletion 9‐31 − Present study
Meningiomaf 37 F CREBBP Microdeletion 9‐31 − Present study
Meningioma 39 F n/a n/a n/a Bilir, Bilir, and Wilson (1990)
Meningioma 39 F n/a n/a n/a Siraganian et al. (1989)
Meningiomab 41 F CREBBP c.1011dupA − Present study
Meningiomae 46 F CREBBP Exonic duplication 4‐23 n/a Present study
Hematological
Leukemia (ALL) 0 M n/a n/a n/a Shaheed, Khamaiseh, Rifai, and Abomelha (1999)
Leukemia (ALL) 2 F n/a n/a n/a Siraganian et al. (1989)
Leukemia (ALL) 3 M n/a n/a n/a Siraganian et al. (1989)
Leukemia (ALL) 6 F n/a n/a n/a Siraganian et al. (1989)
Leukemia (AML) 16 M n/a n/a n/a Jonas, Heilbron, and Ablin (1978); Siraganian et al. (1989)
Lymphoma (follicular) 28 F CREBBP Microdeletion n/a Mar, Digiuseppe, and Dailey (2016)
Lymphoma (mediastinal) 34 F CREBBP c.2842C>T + Wieczorek et al. (2009)
Lymphoma (DLBCL) 57 M CREBBP c.4837delG − Present study
Lymphoma (non‐Hodgkin's)l 33 F n/a n/a n/a Miller and Rubinstein (1995)
Lymphoma (non‐Hodgkin's) 24 M n/a n/a + Siraganian et al. (1989)
Lymphoma (non‐Hodgkin's)j 58 F None found n/a n/a Bartsch et al. (2005)
Genital
Embryonal carcinoma 1 F n/a n/a n/a Miller and Rubinstein (1995)
Ovarian carcinoma (serous)h 29 F n/a n/a n/a Johannesen, Williams, Miller, and Tuller (2015)
Endometrium adenocarcinomah 29 F n/a n/a n/a Johannesen et al. (2015)
MGSCST 14 M No deletion n/a n/a Kurosawa, Fukutani, Masuno, Kawame, and Ochiai (2002)
Seminoma testis 27 M n/a n/a n/a Siraganian et al. (1989)
Germ cell tumor testis 0 M CREBBP c.1824‐1G>A n/a Butler et al. (2016)
HSIL 31 F n/a n/a − Present study
HSIL 49 F CREBBP c.4340C>T + Present study
Cystadenoma (paratubal) 15 F n/a n/a + Siraganian et al. (1989)
Leiomyoma uterus 22 F n/a n/a n/a Present study
Leiomyomaa 48 F n/a n/a − Present study
Dermoid cyst 5 M n/a n/a n/a Bozkirli et al. (2000)
Teratoma ovaryl 22 F n/a n/a n/a Miller and Rubinstein (1995)
Soft tissue
Leiomyosarcoma n/a n/a n/a n/a n/a Stevens, Pouncey, and Knowles (2011)
Leiomyosarcoma omentum 11 M n/a n/a n/a Miller and Rubinstein (1995)
Rhabdomyosarcomak 4 M n/a n/a n/a Siraganian et al. (1989); Sobel and Woerner (1981)
Rhabdomyosarcoma 5 M n/a n/a n/a Miller and Rubinstein (1995); Ruymann et al. (1988)
Hemangioendothelioma 1 F n/a n/a n/a Altintas and Cakmakkaya, (2004)
Granular cell tumor 22 F n/a n/a n/a Burton, Kumar, and Bradford (1997)
Giant cell tumor n/a n/a n/a n/a n/a Stevens et al. (2011)
Circumscribed storiform collagenoma 8 M n/a n/a + Zavras, Mennonna, Maris, and Vaos (2016)
Fibrolipomaa 46 F n/a n/a − Present study
Leiomyoma duodenumk n/a M n/a n/a n/a Siraganian et al. (1989); Sobel and Woerner (1981)
Other malignant tumors
Colon cancerj 50 F None found n/a n/a Bartsch et al. (2005)
Colon carcinoma 58 M CREBBP c.4561‐2A>G + Present study
Thyroid cancer n/a n/a n/a n/a n/a Stevens et al. (2011)
Thyroid cancerj 54 F None found n/a n/a Bartsch et al. (2005)
Lung carcinoma (NSCLC)c 34 F CREBBP Microdeletion − Present study
Hepatoblastoma 0 F CREBBP c.4650_4654del n/a Milani et al. (2016)
Renal tumor n/a n/a n/a n/a n/a Stevens et al. (2011)
Odontoma 7 F n/a n/a n/a Felgenhauer (1973); Siraganian et al. (1989)
Parathyroid adenoma 18 F n/a n/a n/a Siraganian et al. (1989)
Thymoma 11 M n/a n/a n/a Verhoeven, Tuinier, Kuijpers, Egger, and Brunner (2010)
Breast
Breast adenocarcinomac 31 F CREBBP Microdeletion − Present study
Breast cancer 55 F EP300 c.4066C>T − Fergelot et al. (2016)
Breast cancerj 43 F None found n/a n/a Bartsch et al. (2005)
Breast cancer n/a F n/a n/a n/a Levitas and Reid (1998)
Fibroadenoma breaste 38 F CREBBP Exonic duplication 4‐23 n/a Present study
Pilomatricoma
Pilomatricoma 2 M CREBBP Microdeletion − Present study
Pilomatricoma 4 F CREBBP c.1318C>T + Present study
Pilomatricoma 4 F No deletion n/a − Masuno et al. (1998)
Pilomatricoma (multiple) 4–20 F n/a n/a n/a Bayle et al. (2004)
Pilomatricoma 5 F CREBBP Microdeletion 1‐4 − Present study
Pilomatricoma 5 M No deletion n/a − Masuno et al. (1998)
Pilomatricomag 6 F CREBBP c.2199delG n/a Yoo et al. (2015)
Pilomatricoma (multiple) 6,15 F CREBBP Microdeletion 1‐31 + Present study
Pilomatricoma 8 F EP300 c.1948delA n/a Sellars, Sullivan, and Schaefer (2016)
Pilomatricoma 9 F CREBBP Microdeletion 1‐31 + Present study
Pilomatricoma 10 F No deletion n/a + Masuno et al. (1998)
Pilomatricoma (multiple) 12 F CREBBP c.5837dupC n/a Rokunohe, Nakano, Akasaka, Toyomaki, and Sawamura (2016)
Pilomatricoma (multiple) 12 F n/a n/a n/a Cambiaghi, Ermacora, Brusasco, Canzi, & Caputo (1994); Miller and Rubinstein (1995)
Pilomatricoma 12 F CREBBP t(2;16)(p13.3;p13.3) − Imaizumi and Kuroki (1991); Masuno et al. (1998)
Pilomatricoma 12 M n/a n/a n/a Miller and Rubinstein (1995)
Pilomatricoma 14 M CREBBP Exonic duplication 12‐19 + Present study
Pilomatricoma 15 M CREBBP c.4394 +–4A>C − Present study
Pilomatricoma (multiple) 19,37 F EP300 Microdeletion 24‐29 − Present study
Pilomatricoma 49 F CREBBP c.6127C>T + Papathemeli et al. (2015)
Pilomatricoma n/a F EP300 c.5153C>T − Negri et al. (2015)
Pilomatricoma n/a F EP300 Microdeletion − Negri et al. (2015)
Pilomatricoma (multiple) n/a F CREBBP c.4627G>T − Lopez‐Atalaya et al. (2012)
Pilomatricoma n/a F EP300 c.1553_1554dup − Fergelot et al. (2016)
Pilomatricoma n/a F EP300 c.4946G>A + Fergelot et al. (2016)
Pilomatricoma n/a F EP300 c.2113C>T + Fergelot et al. (2016)
Pilomatricoma n/a M EP300 c.4954_4957dup − Fergelot et al. (2016)
Pilomatricoma n/a F EP300 c.1876C>T + Fergelot et al. (2016)
Pilomatricoma (multiple patients) n/a n/a n/a n/a n/a Stevens et al. (2011)
Pilomatricoma n/a F CREBBP 6122_6125del n/a Chiang et al. (2009)
Vascular
Angiofibroma 5 M n/a n/a n/a Siraganian et al. (1989)
Angioma (cerebellum) n/a F n/a n/a n/a Thienpont et al. (2010)
Soft tissue angioma n/a M EP300 Microdeletion 1‐31 n/a Negri et al. (2015)
Hamartoma (occipital) n/a n/a n/a n/a n/a Stevens et al. (2011)
Hemangioma 15 M CREBBP c.406C>T − Present study
Hemangioma (capillary) 1 M CREBBP del(16)(p13.3p13.3) n/a Bartsch et al. (1999)
Hemangioma (capillary)i n/a M n/a n/a n/a Sahiner, Senel, Erkek, Karacan, and Yoney (2009)
Hemangioma (capillary) n/a M No deletion n/a + Balci et al. (2004)
Hemangioma (forehead) 0 M CREBBP c.778C>T n/a Wincent et al. (2016)
Hemangioma (forehead) n/a F CREBBP Microdeletion − Lopez‐Atalaya et al. (2012)
Hemangioma (frontal) 0 F n/a n/a − Candan, Ornek, and Candan (2014)
Hemangioma (glabella) n/a M CREBBP Microdeletion n/a Rusconi et al. (2015)
Hemangioma (glabella) n/a F CREBBP Microdeletion 4‐16 n/a Rusconi et al. (2015)
Hemangioma (hepatic)i 6 M n/a n/a n/a Sahiner et al. (2009)
Hemangioma (uvula)b 41 F CREBBP c.1011dupA − Present study
Other benign skin tumors
Dermatofibromaf 32 F CREBBP Microdeletion 9‐31 − Present study
Dermoid cyst eye 6 F n/a n/a + Siraganian et al. (1989)
Glomus tumorm n/a M n/a n/a n/a Siraganian et al. (1989)
Lacrimal caruncle nevus 28 M n/a n/a n/a Pogrzebielski, Piwowarczyk, Kohylarz, and Romanowska‐Dixon (2007)
Naevus depigmentosusg 6 F CREBBP c.2199delG n/a Yoo et al. (2015)
Nevus 8 M n/a n/a n/a Schepis, Greco, Siragusa, Batolo, and Romano (2001)
Nevusd 9 M CREBBP Exonic duplication 4‐23 n/a Present study
Nevus 21 F n/a n/a − Present study
Nevusd 25 M CREBBP Exonic duplication 4‐23 n/a Present study
Nevus 40 F n/a n/a n/a Present study
Spitznevus 20 F n/a n/a − Present study
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“a” to “m,” Same individual having more than one tumor; Age, age at onset; n/a, data not available; M, male; F, female; ALL, acute lymphatic leukemia; AML, acute myeloblastic leukemia; MGSCST, malignant gonadal sex cord stromal tumor; NSCLC, non‐small cell lung carcinoma; DLBCL, diffuse large B‐cell lymphoma; HSIL, high‐grade squamous intra‐epithelial lesion of the cervix.

3.3. Genotype–phenotype correlation

In 51 of the 87 RSTS individuals in the present cohort, information on the germline variant in CREBBP (n = 42) or EP300 (n = 3) was available. Variants could be classified as missense mutations leading to single amino acid alterations (n = 4), large deletions and duplications (n = 18), nonsense and frameshift mutations resulting in early truncation (n = 18), and splice site mutations (n = 5). In three patients, a germline variant in CREBBP (n = 1) and EP300 (n = 2) was reported without further details and in eight patients no germline variant in either gene was found, despite a clinical diagnosis of RSTS.

Benign and malignant tumors were predominantly found in the large deletion/duplication group (19 tumors in 10/18 patients) and to a lesser extent in the groups with nonsense/frameshift mutations, (5 tumors in 4/14 patients), splice site mutations (3 tumors in 3/5 patients), and missense mutations groups (1 tumor in 4 patients). However, the effect of different variants on protein function is fully unpredictable, precluding any conclusions on specific associations and thus no clear genotype–phenotype correlations were observed in our series.

In the eight individuals without a detectable germline variant in CREBBP or EP300, no tumors were observed. There was no clear clustering of pathogenic variants in relation to tumors within the functional domains of CREBBP, and the variants are spread along the gene in the groups with and without tumors in similar ways (Figure 2).

Figure 2.

Figure 2

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Variants in CREBBP in present cohort of individuals with RSTS with pilomatricoma, meningioma, intracranial malignancies, and other malignancies, compared to all CREBBP variants reported in LOVD. Various functional protein domains are indicated schematically. Individuals with a tumor from the present series of individuals with RSTS are indicated above the protein cartoon, individuals with RSTS reported in the LOVD are reported below the cartoon, each line or symbol representing a single individual. No specific distinction can be made between those with and without tumors in the latter series as this information is not known for all individuals. [Color figure can be viewed at wileyonlinelibrary.com]

The CREBBP/EP300 mutation status was available in 28 RSTS individuals with a tumor reported in the literature, 10 missense mutations, 9 with truncating mutations, 7 with large deletions, 1 with a splice site mutation, and 1 with a translocation.

4. DISCUSSION

In this nation‐wide, population‐based cohort of 87 Dutch individuals with RSTS, the incidence of benign and malignant tumors was assessed. In Dutch individuals with RSTS, various malignant tumors were observed. Per age category, the incidence is compared to the general Dutch population (IKNL, [Link]), but small numbers preclude formal epidemiological risk assessment (Figure 1). The overall frequency of malignancies in the presently reported Dutch RSTS population (8.3% in those with proven variants, 4.6% overall) is higher than previously reported by Siraganian and Miller (1.5% and 2.3%, respectively) (Miller & Rubinstein, 1995; Siraganian et al., 1989) in individuals with an age distribution similar to the present cohort. As the same definition for malignant tumors was used by the latter authors as by us, this may be caused by the opportunity in the Netherlands of using a comprehensive, population‐based, and nation‐wide search strategy. However, as PALGA has a nation‐wide coverage since 1989 only, the number of tumors may still be an underestimation, as tumors that have occurred before 1989 may have been missed.

In the present cohort, no single type of malignancy predominated. One individual with medulloblastoma and one individual with DLBCL were observed at (expected) ages of 9 and 57 years, respectively. In literature, five cases of medulloblastoma and 11 hematological malignancies have been reported at ages of 4–9 years and 0–58 years, respectively. The selection bias in the overview due to using case reports and non‐systematically gathered case‐series, prevents drawing any conclusions with respect to true frequencies of these tumors in individuals with RSTS or to associations between tumors and CREBBP/EP300 variants.

Meningiomas were present in 8.3% of molecularly proven Dutch RSTS individuals (4.6% of all Dutch RSTS individuals) and occur in <0.1% in the general Dutch population (Casparie et al., 2007; Wiemels, Wrensch, & Claus, 2010), supporting an increased risk to develop meningioma in RSTS individuals (Bourdeaut et al., 2014; Miller & Rubinstein, 1995; Skousen, Wardinsky, & Chenaille, 1996). This is further supported by presentation of two metachronous, independent meningiomas in a single individual in the present study, who has been reported before separately (Verstegen, van den Munckhof, Troost, & Bouma, 2005).

Pilomatricomas were found frequently (16.7% of molecularly proven and 9.2% of all individuals in the present study group; 0.16% histopathological diagnoses in general population in the same time interval (Casparie et al., 2007). Likely the incidence of pilomatricomas is even higher, since these are usually diagnosed on clinical grounds and only excised and submitted for histopathological examination when giving complaints. The same applies for naevi and other benign skin lesions. Though perhaps of little clinical importance, the association between RSTS and pilomatricoma remains intriguing, and may have a similar background as the increased frequency of keloids in individuals with RSTS (van de Kar et al., 2014). In the Dutch RSTS population, however, we have been unable to detect an association between their occurrences.

In the present cohort, genotype–phenotype correlation could be studied in 48 individuals for whom information regarding the CREBBP and EP300 mutation status was available, and in literature similar data were available for 28 persons with RSTS. There was no obvious correlation between the incidence of tumors in general or specific tumor types with the location of variants within CREBBP. Tumors may be somewhat more common in individuals carrying large deletions as such deletions occur in 10% of RSTS individuals only (van Belzen, Bartsch, Lacombe, Peters, & Hennekam, 2011), but no firm conclusion is possible without data on much larger groups of RSTS individuals. A specific surveillance in children or adults with RSTS to detect tumors at an earlier age is not indicated based on presently available data.

In our cohort, we observed one patient with DLBCL (germinal center B‐cell [GCB]‐like subtype). Since somatic CREBBP mutation is a very frequent early event in follicular B‐cell lymphoma and diffuse large B‐cell lymphoma (Lohr et al., 2012; Morin et al., 2011; Pasqualucci et al., 2011; Zhang et al., 2011), this case was studied for somatic CREBBP alterations (Stevens et al., 2017). A somatic CREBBP mutation on one allele was found (His1438Asp, variant allele frequency [VAF] 25%), while the known germline mutation (CREBBP c.4837delG) was found in only 6% of sequence reads. These results should be interpreted as deletion of the germline mutated allele with an acquired, possibly subclonal alteration on the other allele in tumor cells. This may be suggestive of a tumor suppressor model for CREBBP in lymphoma.

Possible relations between somatic CREBBP/EP300 mutations in other tumors have been implied. A biallelic deletion of CREBBP in medulloblastoma has been demonstrated (Bourdeaut et al., 2014), and somatic mutations have been detected in small numbers of breast and colon carcinomas well (Iyer, Ozdag, & Caldas, 2004). Linking CREBBP/EP300 to meningiomas and pilomatricomas would be very interesting, however to our knowledge, no literature to date is available regarding these tumors. More comprehensive research is required to study the possible role of CREBBP and EP300 in oncogenesis.

Based on a nationwide, population‐based study, we conclude that RSTS individuals are at increased risk to develop meningiomas and pilomatricomas. An increased risk for malignant tumors could not be substantiated, but can also not be fully dismissed based on the small numbers of affected individuals both reported by us and in the literature and additional (international) studies are warranted. No genotype–phenotype correlation became evident. Based on the present data, a surveillance for specific tumors is not indicated in individuals with RSTS.

Supporting information

Additional Supporting Information may be found online in the supporting information tab for this article.

Table S1. Overview of All Individuals with Rubinstein–Taybi Syndrome in the Netherlands and tumors detected between 1986 and 2015.

Click here for additional data file. (55.9KB, docx)

Boot MV, van Belzen MJ, Overbeek LI, et al. Benign and malignant tumors in Rubinstein–Taybi syndrome. Am J Med Genet Part A. 2018;176A: 597–608. https://doi.org/10.1002/ajmg.a.38603

Raoul C. Hennekam and Daphne de Jong contributed equally.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

Additional Supporting Information may be found online in the supporting information tab for this article.

Table S1. Overview of All Individuals with Rubinstein–Taybi Syndrome in the Netherlands and tumors detected between 1986 and 2015.

Click here for additional data file. (55.9KB, docx)

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