Tumour regression grade (TRG) analyses in patients with resectable gastro-oesophageal adenocarcinomas treated with platinum-based neoadjuvant chemotherapy.
OBJECTIVE
Neoadjuvant chemotherapy followed by surgery is the standard of care for patients with gastro-oesophageal adenocarcinoma. The aims were to validate the utility of the tumour regression grade (TRG) in patients who have received chemotherapy and to investigate if (i) TRG correlates with tumour downstaging and (ii) TRG could provide a comparative platform for future predictive biomarker investigations.


RESULTS
Three pathologists were blinded to the treatment approaches. Review included diagnosis, tumour grade, TNM staging, vascular invasion, perineural invasion, resection margin involvement and histopathological response to chemotherapy, as measured by TRG. In the neoadjuvant chemotherapy (CS) group (n = 84), 46.7% of gastric/gastro-oesophageal junction adenocarcinomas, and 45.5% of lower third oesophageal adenocarcinomas had TRG 1, 2 or 3 compared with 13.7% in the primary surgery group (n = 124) (P < 0.001 and P = 0.006, respectively). In the CS group, responders (TRG 1, 2 or 3) showed significant tumour downstaging [early ypT-stage disease (P = 0.002)]. In gastric cancers specifically, additional associations were seen with negative nodal disease (P = 0.044) and absence of vascular invasion (P = 0.027).


CONCLUSIONS
TRG may reflect response to chemotherapy. In addition, positive correlations between TRG and ypTNM staging were demonstrated that would suggest tumour downstaging.
Fareed
Khaleel R
KR
Laboratory of Molecular Oncology, Academic Unit of Oncology, School of Molecular Medical Sciences, Faculty of Medicine & Health Sciences, University of Nottingham, Nottingham, UK.
Ilyas
Mohammad
M
Kaye
Philip V
PV
Soomro
Irshad N
IN
Lobo
Dileep N
DN
Parsons
Simon L
SL
Madhusudan
Srinivasan
S
D000230:Adenocarcinoma / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage / Q000627:therapeutic use; D000069287:Capecitabine; D002945:Cisplatin / Q000008:administration & dosage; D003131:Combined Modality Therapy; D003841:Deoxycytidine / Q000008:administration & dosage / Q000031:analogs & derivatives; D004305:Dose-Response Relationship, Drug; D015251:Epirubicin / Q000008:administration & dosage; D004938:Esophageal Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery*; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage / Q000031:analogs & derivatives; D006801:Humans; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy / Q000379:methods*; D009367:Neoplasm Staging; D010984:Platinum / Q000627:therapeutic use*; D012074:Remission Induction; D012189:Retrospective Studies; D016037:Single-Blind Method; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome
D003841:Deoxycytidine; D015251:Epirubicin; D010984:Platinum; D000069287:Capecitabine; D002945:Cisplatin; D005472:Fluorouracil