INVESTIGADORES
ANTELO Marina
congresos y reuniones científicas
Título:
Facing rectal cancer under the age of 50. Analysis of 140 patients discussed in a multidisciplinary team (Co-Recto) in Argentina
Autor/es:
ISEAS, S.; ANTELO, M.; AGUILO, A.; CARBALLIDO, M.; MENDEZ, G.; BARUGEL, M; DIEGUEZ, A.; LEIRO, F.; CORAGLIO, M. ; ELETTA, M.; VIRGINILLO, J.; MOSPANE, L.; ROCA, E,
Lugar:
Barcelona
Reunión:
Congreso; ESMO World Congress on Gastrointestinal Cancer; 2012
Institución organizadora:
European Society for Medical Oncology
Resumen:
BACKGROUND:
Recent studies have outlined an increase in the incidence rates of rectal cancer among
adults aged 50 and younger, a group for whom average-risk screening is not a
standard of care. Controversies still exist regarding its features and
prognosis. METHODS: Between February-2007 and December-2011, 578 rectal
cancer pts were registered and discussed in our multidisciplinary team
¡°Co-Recto¡±. A retrospective cohort analysis was performed in a subset of adults
aged ¡Ü50 years, focusing on clinical and demographic parameters, preoperative
assessment, therapeutic approach, tumor response and pattern of disease
recurrence. RESULTS: 140/578 (24.2%) pts were aged between 18-50 years,
of whom 82 (58%) were identified as being aged ¡Ü40 at presentation. Median age was 37 years, 73/140
(52%) were female. Only 35/140 (25%) had
medical insurance. The mean time from
symptoms onset to diagnosis was 6 months (1-34 months). The most frequent tumor
location was lower rectum: 74/140 (53%). Median distance from the anal verge
was 50 mm (10¨C150 mm).
Levator muscle - external anal sphincter were involved in 26/140 pts
(18%). 26/140 (18%) tumors were
single-ring cells- mucinous adenocarcinoma. Regarding colorectal cancer high-risk
conditions, 9/140 (7%) pts had familial adenomatous polyposis and 8/140 (6%)
had inflammatory bowel disease. Lynch syndrome was assessed in 23/140 (16%) pts
with microsatellite instability (MSI) analysis and/or immunohistochemistry (IHQ)
analysis of mismatch repair (MMR) proteins MLH1, MSH2, MSH6 and PMS2. 22/23 (96%) pts had MMR proficient tumors;
in 1/23 pts (4%) a germinal mutation in PMS2 was identified (Lynch syndrome).
10/23 pts were also screened for the two
most prevalent MUTYH mutations: G393D and Y176C, identifying
biallelic MUTYH mutations in 1 case. 19/140
(13.5%) pts had already undergone elective surgery before discussion in
¡°Co-Recto¡±, and 121/140 (86.5%) were
assessed preoperatively in ¡°Co-Recto¡± to decide the best therapeutic approach.
Clinical staging at diagnosis was I: 6(5%), II 18(15%), III 66(54%) and IV:
31(26%). A curative intent therapeutic approach was done in 90 (64%). Neoadjuvant
treatment was delivered in 61/90 (68%): induction chemotherapy 49/61 (80%), chemoradiotherapy
mostly based on capecitabine 58/61 (95%), and chemotherapy alone followed by
TME surgery 3/61 (5%). 2/61 pts with clinical complete response by MRI were
considered for a watch and wait strategy, pathological complete response rate was 19% (11/59). After a
median follow up of 23 months (2-54m), the recurrence rate was: local
2/61 (3.2%), distant 4/61 (6.5%), and both (1/61). CONCLUSION: In our
experience, young-onset rectal cancer frequently presents with locally advanced
and/or metastatic disease, requiring more aggressive treatments. Distant
relapses often occur. Known hereditary syndromes seem to have a low prevalence. We highlight the challenge
of reviewing current screening strategies to warrant a proper and early diagnosis in
young patients.