1 Royal Free and University College Medical School, Department of Obstetrics and Gynaecology, Fertility and Reproductive Medicine Laboratories, UCL/University College Hospitals Trust, Rosenheim Building, 25 Grafton Way, London WC1E 6DB, 2 Department of Medicine, University Street, London WC1E 6AU and 3 Institute of Urology St Peters and Middlesex Hospital, London W1N 8AA, UK
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Abstract |
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Key words: adolescent/cancer/cryopreservation/semen/sperm
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Introduction |
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This information being presented on adolescent cancer patient semen is unique for its size and important for the increasing focus on adolescent patient fertility preservation. Rare reports on adolescent and childhood cancer patients do exist. However, these are on small patient numbers providing commentary on sperm number and motility increase with age against a background of unclear controls (Muller et al., 2000). Otherwise, they appear to cover adult cancer patients aged 2063 years (Kliesch et al., 1996
) and 1522 years (Hovav et al., 2001
); or applying non-age-matched controls (Kliesch et al., 1996
). On the other hand, reports on childhood cancers seem to cover significant numbers of early to mid-adolescent patients (<116 years, mean age 12 years) (Nygaard et al., 1991
; Relander et al., 2000
). The necessity for a definition of `adolescence' in relation to reproductive issues would thus seem to have been largely overlooked (Bahadur and Hindmarsh, 2000
). It would seem appropriate to adopt biological and reproductive criteria and equate the onset of adolescence with puberty. However, although the end of puberty is generally taken to coincide with the end of growth, in the modern context this may include physical, reproductive, psychological and psychosocial development. It is therefore convenient to adopt an objective age point and we have defined this as age 19 years 11.9 months in accordance with the cancer survival epidemiologists.
In part, the discrepancy between the treatment of adults and adolescents arises due to controversial questions of maturity, sensitivity and legal precepts in relation to gaining consent in this group. In this regard we have recently introduced our approach to the handling of adolescent cancer patients (Bahadur et al., 2001). Apart from these discreet handling procedures for adolescent males, semen samples may have to be kept for much longer periods than their adult counterparts, as post-treatment adolescents can expect many decades of life ahead of them (Richards et al., 2000
). However, there is also a reluctance by some parents and clinicians to refer the patient to bank semen due to doubts as to whether he would be able to masturbate or whether the quality of the semen would be viable. This paper aims to address these doubts.
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Materials and methods |
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The semen analyses were performed in accordance with WHO guidelines (World Health Organization, 1987, 1992
) using a Neubaur counting chamber or Makler counting chamber. Sperm freezing was performed using an egg yolk-based medium containing 10% glycerol (Peek et al., 1982
; Pilikian et al., 1982
; Mahadevan and Trounson, 1983
), mixed with an equi-volume of cryoprotectant, and usually 1 ml aliquoted vials were made. The patient groups were categorized according to disease types that appear in Table I
.
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Mean, SD and SEM for age, sperm count (x106/ml), motility (%) and volume (ml) were calculated using the Statistical Package for Social Science (SPSS, version 6.1).
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Results |
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The disease bands are shown in Table I and included Hodgkin's lymphoma, non-Hodgkin's lymphoma, osteosarcoma, Ewing's sarcoma, acute lymphoblastic leukaemia (ALL), acute myeloid leukaemia (AML), testicular, leukaemia, and others. The sperm counts were broadly similar across the disease bands although those in the AML group appeared to be lower. Semen volume was broadly uniform across the disease groups except the ALL and Ewing's sarcoma groups, which showed relatively reduced and increased mean semen volumes respectively (Table I
). Older adolescent patients appeared to have a higher mean semen volume (Table II
).
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Discussion |
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Where semen was produced, the sperm count appeared broadly unaffected within the single year age bands. Within the adolescent group, there appears little difference in the sperm count and volume in relation to most of the disease groups, thereby indicating some uniformity in testicular maturation having been achieved once post-pubertal. It also reinforces the view that childhood testes are by no means quiescent as shown in the marmoset model and therefore even greater care needs to be exercised in protecting children's fertility before treatment (Kelner et al., 2002). It is undeniable that any strict policy of referral to bank sperm, based on age, would have denied significant numbers of adolescent cancer patients the chance to store their sperm. For instance, if the threshold age of <16 years were applied, this would have amounted to 28.8% (59/205) of the successful group being denied the chance to store sperm. Provided the patient has understood the issues (Bahadur et al., 2001
), it seems unreasonable to deny a 12 year old a chance to bank semen. It may, however, be prudent to consider patients from 10 years upwards if they have fully understood the issues. This is to overcome possible inconsistent interpretation by individual specialists applying a subjective pubertal classification (Tanner, 1989
). There was no disease group in which sperm could not be stored. In all cases the quality of the semen was potentially useful for assisted conception procedures.
Having a broad policy of storing 1 ml vials, containing semen and cryoprotectant mixed in equi-volume, it is therefore reasonable to obtain 34 vials per ejaculate for an adolescent cancer patient, and we aim for 23 ejaculates. However, the number of vials made could be increased, depending on individual circumstances, such as the inability to provide a second or third ejaculate for sperm banking, or on the semen quality. The 33 patients who were unable to produce semen, representing 13.9% of the cohort, deserved an in-depth report (Bahadur et al., 2002) considering the complex clinical management issues that may follow, as well as sensitive patient and parent involvement.
The question of ethical controls will become increasingly prominent in this field involving adolescent cancer patients and their fertility, as studies on healthy age-matched subjects are likely to encounter widespread recruitment difficulty or disapproval. Even in adult patients, ethical controls appear to have been applied to alleviate the use in research of sperm cryopreserved before cancer treatment (De Mas et al., 2001). Despite this limitation in recruiting healthy adolescent age-matched controls and with unequal numbers, significant conclusions on semen quality seem to have been reported (Kliesch et al., 1996). Given the exclusive nature of our cohort and the increasing clinical importance of the topic, we have undertaken analyses against a healthy cohort which are not age-matched, and remarks have to be kept in perspective and for illustration purposes only. Without age-matched controls the analysis of variance followed by Duncan's test was not performed for our study. The sperm counts were broadly uniform across the disease groups, with the exception of the AML group, but lower than the healthy cohort (Table I
). In Hodgkin's disease and osteosarcoma, lower sperm numbers, motility and volume were seen in relation to the healthy cohort (Table III
). The sperm quality for the whole adolescent cancer patient cohort was poorer in relation to the healthy sperm donors in terms of count, motility and volume (Table IV
). This mirrors the findings in adult disease with significantly impaired sperm quality in adult Hodgkin's disease and non-Hodgkin's disease being reported compared with healthy donors (Botchan et al., 1997
). Pre-treatment sperm quality is usually impaired among adult cancer patients (Chapman et al., 1981
; Vigersky et al., 1982
). The semen volumes were broadly uniform across the disease groups, except the ALL and Ewing's sarcoma groups, which had relatively lower and higher mean semen volumes respectively (Table I
). It is interesting to note that our older adolescent patients may have a higher semen volume (Table II
).
In boys, testicular failure may be a result of Leydig cell dysfunction or germinal epithelium dysfunction, or both. Direct irradiation of the testes in total body irradiation results in permanent Leydig cell failure and ablation of the germinal epithelium. This results in infertility and a need for lifelong testosterone therapy (Shalet et al., 1985; Castillo et al., 1990
) following its initiation at ~1213 years. Cytotoxic chemotherapy can cause germinal epithelium damage which could possibly be reversed. Although sperm may recover after a prolonged period of time, it is clear that there is a fertility deficit after cancer treatment amongst long term male survivors (Byrne et al., 1987
; Siimes and Rautonen, 1990
). Even the pre-pubertal state would not seem to protect the gonads from the effects of treatment (Aubier 1989; Shafford, 1993), although testicular function appears to be worse if patients are treated post puberty (Hieken et al., 1996
).
Study of the outcome of pregnancy and offspring born after childhood cancer do not provide evidence of germ cell mutagenesis, manifested in increased congenital malformations, neonatal mortality or cancers in offspring. However, much larger patient numbers would be needed to rule out any of these associations with confidence (Li et al., 1979; Otake et al., 1990
; Yoshimoto et al., 1990
; Hawkins, 1991
, 1994
; Dodds et al., 1993
; Byrne et al., 1998
). With incomplete registrations of spontaneous abortions, miscarriages and elective abortions coupled with methodological problems, caution is needed in interpreting these data.
It has been noted that young men offered sperm banking before treatment for Hodgkin's disease often appear to use denial to avoid acknowledging the possibility of future infertility (Cella and Najavits, 1986). However, men with testicular cancer who remained childless after treatment were clearly distressed about their infertility (Rieker et al., 1990
). It is interesting to note that in a quality-of-life analysis, a great majority of younger cancer survivors saw their cancer experience as potentially making them better parents (Schover et al., 1999
). It would appear therefore that the undoubted sensitivity of adolescent cancer patients concerning fertility considerations should lead clinicians to offer positive encouragement to try to have sperm cryopreserved rather than ignoring the issue.
In conclusion, sperm banking in adolescent cancer patients was a practical and feasible option in the majority (86.1%, 205/238) of our cohort and all producers were able to provide samples by masturbation, which would be suitable for assisted reproductive technologies. In our cohort, the minimum age at which sperm could be produced and cryopreserved was 12 years.
Adequate counselling and support to adolescent cancer patients and their parents is essential, both in terms of coming to terms with their sexual maturity and in the event of their failing to produce semen.
The high level of successful sperm banking should be reassuring to physicians, parents and the adolescent cancer patients in relation to any uncertainty to the patients' future fertility potential. Additionally, the positive news should provide a much needed psychological boost before embarking on chemo- or radiotherapy.
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Notes |
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References |
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Submitted on July 20, 2001; resubmitted on June 18, 2002; accepted on August 9, 2002.