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Infradiaphragmatic irradiation and high procarbazine doses increase colorectal cancer risk in Hodgkin lymphoma survivors

This article has been updated

Abstract

Background:

Hodgkin lymphoma (HL) survivors are at increased risk of second malignancies, but few studies have assessed colorectal cancer (CRC) risk after HL treatment. We assessed long-term, subsite-specific CRC risk associated with specific radiation fields and chemotherapy regimens.

Methods:

In a Dutch cohort of 3121 5-year HL survivors treated between 1965 and 1995, subsite-specific CRC incidence was compared with general population rates. Treatment effects were quantified by Cox regression analyses.

Results:

After a median follow-up of 22.9 years, 55 patients developed CRC. The standardized incidence ratios (SIR) was 2.4-fold increased (95% confidence interval (95%CI) 1.8–3.2), leading to 5.7 excess cases per 10 000 patient-years. Risk was still increased 30 years after HL treatment (SIR: 2.8; 95%CI: 1.6–4.6). The highest (SIR: 6.5, 95%CI: 3.3–11.3) was seen for transverse colon cancer (15.0 (95%CI: 4.3–40.8) after inverted-Y irradiation). A prescribed cumulative procarbazine dose >4.2 g m−2 was associated with a 3.3-fold higher CRC risk (95%CI: 1.8–6.1) compared to treatment without procarbazine. Patients receiving >4.2 g m−2 procarbazine and infradiaphragmatic radiotherapy had a hazard ratio of 6.8 (95%CI: 3.0–15.6) compared with patients receiving neither treatment, which is significantly higher than an additive joint effect (Padditivity=0.004).

Conclusions:

Colorectal cancer surveillance should be considered for HL survivors who received Infradiaphragmatic radiotherapy and a high cumulative procarbazine dose.

Main

Due to the introduction of multi-agent chemotherapy and the continuing improvements in radiation techniques, Hodgkin lymphoma (HL) has become the prototype of a curable malignancy. Currently, the 10-year disease-specific survival is more than 85% for patients diagnose before 55 years of age (IKNL, 2012). As a result of this favourable prognosis, there is a growing population of HL survivors at risk of long-term complications caused by radiation therapy and chemotherapy. The risk of solid malignancies after HL treatment, especially risk of breast and lung cancer, has been studied extensively (Swerdlow et al, 2000; van Leeuwen et al, 2000; Dores et al, 2002; Ng et al, 2002; Travis et al, 2002; Travis et al, 2003; Hodgson et al, 2007; De Bruin et al, 2009; van den Belt-Dusebout et al, 2009; Swerdlow et al, 2011; Reulen et al, 2011; Swerdlow et al, 2012; Morton et al, 2013; Dores et al, 2014; Schaapveld et al, 2015). Although colorectal cancer (CRC) is the third most common solid malignancy in HL survivors (Hodgson et al, 2007; Schaapveld et al, 2015), so far few studies have specifically examined risk factors for CRC after HL treatment (Birdwell et al, 1997; Hodgson et al, 2007).

Colon and rectal cancers are often grouped together as they share genetic and epidemiological features (Schottenfeld Winawer, 1982; Network, 2012). Among Japanese atomic bomb survivors increased risk of colon, but not rectum cancer, emerged from 10 years after exposure (Nakatsuka et al, 1992; Nakachi et al, 2006; Preston et al, 2007). Excess rectum cancer risk was found after exposure to higher radiation doses (Land, 1986). Although in atomic bomb survivors, colon subsites showed equal sensitivity to radiation (Nakatsuka et al, 1992); studies of CRC risk among medically-irradiated subjects are complicated by the fact that the colon extends over a large part of the abdomen, and depending upon the radiation techniques, may receive markedly non-uniform doses. Surprisingly, CRC risk has not previously been assessed specifically for colorectal subsites.

Procarbazine has been shown to increase the risk of stomach (van den Belt-Dusebout et al, 2009; Morton et al, 2013) and lung cancer (Swerdlow et al, 2001; Travis et al, 2002) in HL patients. Although Morton and colleagues found statistically significant associations of stomach cancer risk with exposure to procarbazine or dacarbazine but not with other alkylating agents, in the study by Travis and colleagues lung cancer risk was associated both with exposure to mechlorethamine or procarbazine. It is unknown whether chemotherapy also affects CRC risk among HL survivors. However, alkylating agent exposure was associated with an 8.8-fold increased risk of CRC among childhood cancer survivors (9 out of 19 CRC diagnosed in childhood HL survivors) treated at St Jude Children’s Research Hospital (Nottage et al, 2012). Similarly, Henderson and colleagues previously reported that procarbazine independently increased risk, potentially in a dose–response manner, of gastrointestinal malignancies in childhood cancer survivors treated with abdominal irradiation (Henderson et al, 2012). Of note, out of 45 gastrointestinal malignancies, 20 were diagnosed among HL survivors and 24 were colorectal cancers. In this study, we therefore assessed the long-term subsite-specific risk of CRC after HL treatment, taking into account radiation fields and cumulative dose of alkylating agents, in a large multicenter Dutch cohort comprising 3121 5-year survivors of HL.

Patients and methods

Our cohort comprised of HL patients treated in seven Dutch University Hospitals or Cancer Centers and in the affiliated hospitals of the former population-based Eindhoven Cancer Registry. Patient selection and the data collection methods have been described in detail previously (van Leeuwen et al, 2000; De Bruin et al, 2009; Schaapveld et al, 2015). Briefly, patients were younger than 51 years at HL treatment (range: 3.6–50.9), first treated between 1965 and 1995 with radiation therapy and/or chemotherapy, and survived at least 5 years. The detailed treatment data (dates of start of treatment, radiation fields, chemotherapy regimens and number of cycles) were collected from the medical records, both for initial and relapse treatment. Up to 2004 data on second malignancy diagnoses was obtained from the medical records and by contacting general practitioners and attending physicians in other hospitals (94% complete follow-up) (De Bruin et al, 2009). Additionally, CRCs diagnoses between 2004 and January 2011 were ascertained through linkage with the nation-wide PALGA network and registry of histo- and cytopathology (Casparie et al, 2007) and the Netherlands Cancer Registry (NCR). PALGA reached nation-wide coverage in January 1990 and the NCR in January 1989. Completeness of case ascertainment by the NCR is >98% (Schouten et al, 1994).

Colorectal cancers were classified according to the International Classification of Diseases for Oncology (ICD-O-3) (WHO, 2000). Colorectal cancers were categorised into ascending colon (including coecum and hepatic flexure), transverse colon (including splenic flexure), descending colon (including sigmoid colon), and rectum (including rectosigmoid junction). Each CRC was classified as ‘in field’, ‘out of field’ or ‘unknown’ based on review of the radiation fields by a radiation oncologist (BMPA). Vital status was obtained up to January 2011 through linkage with the Dutch Central Bureau of Genealogy; 2.7% of the patients had either emigrated or were otherwise lost-to-follow-up.

Treatment

Over time a wide variety of treatment regimens was used in the cohort. Although primary treatment was usually given in accordance with treatment protocols of the European Organisation for Research and Treatment of Cancer (Favier et al, 2009) treatment for recurrences was generally not standardised. Patients usually received 40 Gy in 20 fractions when treated with radiation therapy only and 30–36 Gy in 15–20 fractions when they also received chemotherapy. Mantle field irradiation (mediastinal, axillary and neck nodes) was the most commonly applied radiation field from the early 1970s to the late 1980s. Infradiaphragmatic radiation, commonly including the para-aortic nodes and spleen (para-aortal field), but frequently also the iliac and inguinal nodes (inverted Y field), was given until the late 1980s as part of (sub)total nodal irradiation (Supplementary Figure 1). Since the late 1980s, a growing number of patients received more limited radiation fields. Information on radiation doses and fractionation schedules for individual patients was not routinely collected for all participating hospitals. From the late 1960s to the 1980s, chemotherapy consisted mainly of MOPP (mechlorethamine, vincristine, procarbazine, prednisone). In the 1980s, anthracycline-containing regimens such as MOPP/ABV (mechlorethamine, vincristine, procarbazine, prednisone/doxorubicin, bleomycin, vinblastine) and ABVD (doxorubicin, bleomycin, vinblastine, dacarbazine) were introduced.

Statistical analysis

Colorectal cancer incidence in the cohort was compared with age-, sex-, subsite and calendar period-specific CRC incidence rates in the Dutch population, accounting for person-years of observation. The cancer incidence data from the Eindhoven Cancer Registry up to 1988 and from the Netherlands Cancer Registry from 1989 onwards were used as reference (IKNL, 2012).

Time at risk began 5 years after the start of HL treatment and ended at the date of CRC diagnosis, date of death or date of most recent medical information, whichever came first. HL was the first primary malignancy in all patients. Patients who developed a subsequent malignancy within 5-years after HL were excluded. All CRC diagnosed 5 years after start of HL treatment were retained in the analyses. Standardized incidence ratios (SIRs) were calculated as the ratios of the observed and expected numbers of CRC in the cohort, and absolute excess risks (AERs) as the observed numbers of CRC in our cohort minus the expected numbers, divided by number of person-years at risk, multiplied by 10 000. Standardized incidence ratios were calculated for any CRC and for colon cancer subsites and rectal cancer separately; analyses were performed by sex, age at first HL treatment, follow-up interval, and type of treatment. Prescribed cumulative procarbazine doses were estimated using standard procarbazine doses per cycle in each chemotherapy regimen as a measure for alkylating chemotherapy dose; that is, three cycles of MOPP or six cycles of MOPP-ABV are equivalent to a prescribed cumulative procarbazine dose of 4.2 g m−2 of body surface area. For 172 patients (7.9% of chemotherapy-treated patients), the prescribed procarbazine dose was unknown. A multivariate single mean imputation approach was applied to account for missing procarbazine doses, under the missing at random assumption, using a multinomial logistic regression model. Variables used for imputation were sex, age, year and hospital at HL treatment, type of chemotherapy and number of cycles, and CRC occurrence (yes/no). Confidence intervals for SIRs and tests for homogeneity and trend of SIRs were calculated using standard methods (Breslow Day, 1987).

The cumulative incidence of CRC was estimated in the presence of death as a competing risk. Multivariable Cox regression analyses were performed to quantify the effects of HL treatment on CRC risk with time since start of HL treatment as time-scale. The proportional hazard assumption was assessed using residual-based methods. Variables considered in this analysis were sex, age and HL treatment. Interaction between a procarbazine dose >4.2 g m−2 and infradiaphragmatic radiation was assessed by evaluating departure from an additive model HR=1+(ß1procarbazine+ß2infraRT) × exp(ß3(procarbazine+infraRT)) or from a multiplicative model HR=exp(ß1procarbazine+ß2infraRT+ß3(procarbazine+infraRT)), that is, by testing whether ß3=0 using a likelihood ratio test. Analyses were performed using STATA (STATA 13, Statacorp LP, College Station, TX, USA) and Epicure statistical software (Epicure, version 1.8, Hirosoft International, Seattle, WA, USA). A P-value <0.05 was considered statistically significant.

Results

Patient characteristics

Median age at start of HL treatment was 27.3 years (interquartile range (IQR) 21.0–35.5; Table 1). Almost 50% had received infradiaphragmatic radiation therapy; 28% received chemotherapy and infradiaphragmatic radiation therapy combined. Chemotherapy mostly comprised of MOPP or MOPP-like chemotherapy; 35.8% of the patients treated with chemotherapy received >4.2 g m−2 procarbazine-containing chemotherapy. Median follow-up was 22.9 years (IQR 16.7–30.7) and 23.4% of patients were followed 30 years.

Table 1 General characteristics of all Hodgkin lymphoma patients and colorectal cancer (CRC) patients

Fifty-five HL survivors developed CRC; 34 patients had colon cancer and 21 rectal cancer. Among the 52 CRC patients treated with radiation therapy, the CRC was located within the radiation field in 46% and outside in 42%; for 12% this was unknown (Supplementary Table 1). The median time to CRC diagnosis was 22.9 years (IQR: 16.7–30.7) and median age at CRC diagnosis was 56.4 years (IQR: 50.6–62.2; Table 1). The youngest CRC patient was 35 years at diagnosis. Most CRCs were stage 2 (38%) or higher (stage 3 (24%) and stage 4 (15%); Supplementary Table 1). At the end of follow-up, 43 CRC patients had died, of whom 17 (40%) due to CRC. The 5-year overall survival after CRC diagnosis was 31%.

CRC risk compared with the general population

HL survivors had a 2.4-fold (95% confidence interval (CI) 1.8–3.2) increased SIR of developing CRC compared with the general population, corresponding to 5.7 excess cases per 10 000 patient-years (Table 2). The SIRs of rectal and colon cancer were 2.4 (95%CI: 1.5–3.7) and 2.5 (95% CI: 1.7–3.4), respectively. While risks of transverse colon (SIR: 6.5; 95%CI: 3.3–11.3) and ascending colon cancer (SIR: 2.2; 95%CI: 1.1–3.8) were increased, the risk of descending colon cancer was not (SIR: 1.2, 95%CI: 0.5–2.4). The SIR was slightly higher in men (SIR: 3.2, 95% CI: 2.2–4.4) than in women (SIR: 1.8, 95% CI: 1.1–2.7; p-heterogeneity: 0.04).

Table 2 Risk of colorectal cancer after HL treatment: SIR, AER, and 20-year and 30-year cumulative incidence

Colorectal cancer risk by age at first and time since HL treatment

The SIR of CRC was highest for patients treated <25 years of age (SIR: 4.9; 95%CI: 2.8–7.8 compared to 1.8; 95%CI: 1.1–2.8, for patients 35–50 years; p-trend 0.004, Table 3). However, while for colon cancer, the SIRs decreased with older age at HL treatment (SIRs were 6.8 and 1.3 for patients treated <25 years or at age 35–50 years, respectively; p-trend <0.001), this was not the case for rectal cancer (SIRs were 2.1 and 2.6 for patients treated <25 years or at age 35–50 years, respectively; p-trend 0.90).

Table 3 Risks of colorectal cancer after HL treatment; SIRs by sex, age, follow-up interval and treatment

The SIR of CRC was elevated from 10 years after treatment and remained increased with longer follow-up duration, with SIRs of 2.3 (95%CI: 1.3–3.7) at 10–19 years and 2.8 (95%CI: 1.6–4.6) at ≥30 years of follow-up (p-trend=0.29). The AER of CRC increased steadily with longer follow-up duration (p-trend<0.001); the AER was 3.6 at 10–19 years and 24.6 per 10 000 patients-years at 30 years of follow-up, respectively (data not shown).

Treatment-specific CRC risk compared to the general population

The SIR of CRC was not increased in patients treated with chemotherapy only or supradiaphragmatic radiation therapy only (Table 2). Patients treated with supradiaphragmatic radiation therapy and chemotherapy had a 2.0-fold increased CRC risk (95%CI: 1.0–3.3). Infradiaphragmatically irradiated patients not treated with chemotherapy had a nonsignificantly increased risk of CRC (SIR: 1.8, 95%CI: 0.8–3.3). The highest SIR of CRC was observed in patients who received infradiaphragmatic radiation therapy and chemotherapy (SIR: 5.7, 95%CI: 3.7–8.2), translating into an AER of 15.9 per 10 000 patient-years. Patients treated with para-aortic fields had a 3.0-fold increased (95%CI: 1.0–7.1) risk of colon cancer. Risk of transverse colon cancer was even 15.9-fold increased (95%CI: 4.3–40.8) after treatment with an inverted-Y field (Table 3). The highest SIR of rectal cancer was observed following treatment with inverted-Y fields (SIR: 6.3, 95%CI: 2.5–13.0). Patients treated with >4.2 g m−2 procarbazine had a strongly increased risk of developing CRC compared with the general population (SIR: 4.3, 95%CI: 2.9–6.1).

Risk factors for CRC: multivariable regression analysis

In multivariable Cox analyses (Table 4), infradiaphragmatic radiation therapy was associated with increased CRC risk (age- and sex-adjusted hazard ratio (HR) 2.8, 95%CI: 1.6–4.9). Patients treated with a procarbazine dose >4.2 g m−2 also had an increased CRC-risk (HR: 3.3, 95%CI: 1.8–6.2) compared to patients receiving 4.2 g m−2 of procarbazine. A very high CRC risk was seen for patients who had received both a procarbazine dose >4.2 g m−2 and infradiaphragmatic radiation therapy (HR: 6.8, 95%CI: 3.0–15.6, compared with patients receiving none of these treatments). The combined effect of prescribed procarbazine dose and infradiaphragmatic radiation therapy showed departure from additivity (padditivity=0.0043), pointing to a synergistic effect of procarbazine and infradiaphragmatic radiation therapy. The data did not support a supermultiplicative joint effect (pmultiplicativity=0.153). This combined effect of a prescribed procarbazine dose >4.2 g m−2 and infradiaphragmatic radiation therapy was stronger for transverse colon and rectal cancer, which were more often located in the radiation fields (HR: 10.1, 95%CI: 3.3–30.7).

Table 4 Treatment-related risk factors for the occurrence of colorectal cancer during follow-up: multivariable Cox regression analysis

Cumulative incidence of CRC

The cumulative incidence of any CRC was 0.6% (95%CI: 0.4–1.0) at 20 years and 2.1% (95%CI: 1.4–2.8) at 30 years of follow-up (Table 2). Although, compared to younger patients, patients aged 35–50 years at HL treatment had a higher cumulative incidence of CRC throughout follow-up (30-year cumulative incidence 2.7%, 95%CI: 1.6–4.3%), their cumulative incidence did not differ much from the population expected CRC incidence (expected 30-year cumulative incidence of 2.7%). In contrast, the cumulative CRC incidence among patients <25 years at HL treatment was much higher than the population-expected CRC incidence throughout follow-up; the 30-year observed cumulative incidence was 1.0% (95%CI: 0.5–1.9%) compared to an expected cumulative incidence of 0.2% (Supplementary Figure 2). The 30-year cumulative incidence was 1.2% (95%CI: 0.8–1.9) for colon cancer and 0.8% (95%CI: 0.5–1.0) for rectal cancer. At the age of 55 years, currently the starting age for colorectal cancer screening in the Dutch population, the cumulative incidence of CRC was 2.4% (95%CI: 1.3–4.1%) for patients treated for HL <25 years of age, compared to an expected cumulative incidence of 0.6% assuming similar CRC rates as in the general population (Figure 1A). Hodgkin survivors treated for HL <25 years of age reached a cumulative incidence of 0.6% at 46.5 years of age. The cumulative incidence of CRC was 0.9% (95%CI: 0.4–1.8%) for patients treated for HL at age 25–34 years. For patients treated for HL before age 35 with both infradiaphragmatic radiation therapy and chemotherapy with a procarbazine dose >4.2 g m−2, the cumulative incidence of CRC was 4.2% (95%CI: 2.3–7.1%) at the age of 55 years, compared to a general population expected cumulative incidence at age 55 years of 0.6% (Figure 1B). These HL patients already reached a cumulative incidence of 0.6% at an attained age of 38 years.

Figure 1
figure1

(A) Cumulative incidence of CRC by attained age according to age at first Hodgkin lymphoma treatment. Solid lines represent the observed incidence, dashed lines the expected incidence. (B) Cumulative incidence of CRC by attained age according to radiation therapy and procarbazine dose for HL patients treated before the age of 35. Solid lines represent the observed incidence, dashed lines the expected incidence. Infra RT=infradiaphragmatic radiotherapy.

Discussion

To the best of our knowledge, this is the first study that assessed long-term subsite-specific CRC-risk after HL treatment in a large multicenter cohort of HL survivors. In our study, HL survivors had a 2.4-fold increased risk to develop CRC compared to the general population; risk was highest for cancer of the transverse colon. The increased CRC risk emerged late and the risk was still increased 30 years after first treatment. An inverted-Y field with/without spleen irradiation was associated with a 15.9-fold increased risk of transverse colon cancer and a 6.3-fold increased risk of rectal cancer. Our most important and novel finding is that CRC risk was especially increased in patients who had received both high-dose procarbazine and infradiaphragmatic radiation therapy (HR: 6.8, 95%CI: 3.0–15.6). This association was stronger for colorectal subsites, which were more likely exposed to higher radiation doses such as the transverse colon and rectum.

In the general population, colon cancer is most often located in the ascending and descending colon (Lemmens et al, 2010). While 12% of all colon cancers in the general population are located in the transverse colon (IKNL, 2012), in our population, 35.3% (12 out of 34) of CRCs were located in the transverse colon. Likely, this is due to the fact that the transverse colon receives a high radiation dose in standard infradiaphragmatic fields. In the atomic bomb survivors, who received whole body irradiation, the colon cancers subsite distribution did not differ by radiation dose, indicating that the different subsites of the colon seem equally sensitive to radiation (Nakatsuka et al, 1992). In a study by Henderson and colleagues (Henderson et al, 2012), evaluating gastrointestinal cancer risk among childhood cancer survivors, 82% of the gastrointestinal cancers were in or near the radiation fields. In line with our results, Nottage and colleagues also reported that among childhood cancer survivors second CRCs were more likely to develop in the irradiated segments of the colon (Nottage et al, 2012).

Exposure to alkylating agents, such as procarbazine, has been shown to increase the risk of several solid tumours in humans (Swerdlow et al, 2001; Travis et al, 2002; van den Belt-Dusebout et al, 2009; Morton et al, 2013; Dores et al, 2014). Our group previously reported increasing stomach cancer risk with higher doses of procarbazine in HL survivors, which was confirmed in a larger international study (van den Belt-Dusebout et al, 2009; Morton et al, 2013). Nottage and colleagues observed that alkylating agent exposure was associated with an almost nine-fold increased risk of CRC; associations with specific agents were not reported (Nottage et al, 2012). In the study by Henderson and colleagues, high-dose procarbazine exposure was independently associated with an increased risk of gastrointestinal malignancies in childhood cancer survivors treated with abdominal radiation, while exposure to procarbazine without abdominal radiation was not associated with gastrointestinal malignancies (Henderson et al, 2012).

Because procarbazine and mechlorethamine (and other components of MOPP- and MOPP-like regimens) were highly correlated (of 1.864 patients treated with procarbazine, 131 (7.0%) did not receive mechlorethamine, while procarbazine and mechlorethamine dose-groups were discordant for only 52 (2.8%) patients), we could not disentangle the effects of both drugs. We attribute the observed increased risk to procarbazine in presentation of our results because procarbazine is given orally and possibly comes in direct contact with colon mucosa and has been implicated in stomach carcinogenesis in previous papers van (van den Belt-Dusebout et al, 2009; Morton et al, 2013).

In accordance with other studies of second solid malignancy risk among HL patients, in our study, CRC relative risk was higher for patients treated at younger ages (Swerdlow et al, 2000; Dores et al, 2002; Hodgson et al, 2007; Schaapveld et al, 2015). However, when evaluating colon and rectum separately, the SIR of rectal cancer was not much affected by age, while colon cancer risk behaved more in line with a radiation-associated pattern, such as observed for breast (van Leeuwen et al, 2000), lung (Swerdlow et al, 2000) and stomach (van den Belt-Dusebout et al, 2009) cancer, also showing the highest SIRs among patients exposed to radiation at the very young ages.

Strengths of our study are the large size of the cohort, the detailed information on HL treatment and the long and complete follow-up for second malignancies. However, despite the large size of our cohort, the number of CRC cases was still rather low for a detailed assessment of the association of HL treatment and subsequent CRC risk. Given the large number of comparisons made in our paper we caution against over-interpretation of our findings, especially when based on small number of events. We had no information on common risk factors for CRC such as family history of CRC.

Surveillance bias is an unlikely explanation for the increased CRC risk in our study, as there have been no CRC surveillance recommendations in HL survivors. Furthermore, CRC screening in the Dutch general population was only introduced in January 2014.

Since HL patients nowadays only rarely receive high-dose procarbazine in combination with infradiaphragmatic radiotherapy, we expect that CRC risk following HL will decrease. Although most patients in our cohort were treated decades ago, often with treatment regimens now considered outdated, evaluation of long-term effects of these treatments remains relevant and our findings have important implications for HL patients treated in the past. Since HL predominantly occurs at young ages, the cohort of HL survivors treated in the 1960s–1980s has only recently reached the ages at which CRC commonly occurs in the general population. Importantly, our data do not show that CRC risk levels off after longer follow-up duration. When considering more intensive CRC surveillance in HL survivors we must realise, however, that we do not know whether the pathogenesis of treatment-induced CRC in HL survivors is similar to that of CRC in the general population. As in the general population, most CRCs among HL survivors were adenocarcinomas and it appears that treatment-induced CRCs are preceded by adenomas as well (Rigter et al, 2016; Rigter et al, 2017). Currently, most screening guidelines for HL survivors do not yet include CRC screening. The Children’s Oncology Group does recommend that childhood cancer survivors exposed to >30 Gy of abdominal radiation have a colonoscopy at least every 5 years, starting at the age of 35, or 10 years after radiation, whichever occurs last (Children’s Oncology Group, 2008). On the basis of our results, also in view of the unfavourable stage distribution and low 5-year overall survival rate, we think that CRC surveillance should be considered in HL survivors who received high-dose procarbazine and infradiaphragmatic radiation therapy, starting 10 years after first treatment but not before the age of 35 years.

Change history

  • 25 July 2017

    This paper was modified 12 months after initial publication to switch to Creative Commons licence terms, as noted at publication

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Acknowledgements

We thank the Netherlands nationwide network and registry of histo- and cytopathology (PALGA) as well as the registration teams of the Netherlands Comprehensive Cancer Organisation (IKNL) for the collection of the data for the Netherlands Cancer Registry and the scientific staff of the Netherlands Comprehensive Cancer Organisation. This work was supported by the Dutch Cancer Society (Koningin Wilhelmina Fonds, grant number NKI 2010-4720).

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Correspondence to Flora E van Leeuwen.

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van Eggermond, A., Schaapveld, M., Janus, C. et al. Infradiaphragmatic irradiation and high procarbazine doses increase colorectal cancer risk in Hodgkin lymphoma survivors. Br J Cancer 117, 306–314 (2017). https://doi.org/10.1038/bjc.2017.177

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Keywords

  • Hodgkin lymphoma
  • colorectal cancer
  • radiation therapy
  • chemotherapy
  • procarbazine
  • second malignant neoplasm
  • long-term complications

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