Résumé de Article 087(1) EPC pour la décision T0883/23 du 26.09.2025

See also abstract under Article 12(6) RPBA. In T 883/23 the board had to decide whether claim 1 of the main request was entitled to claim priority from the earliest priority application (P1). P1 disclosed a method for treating pancreatic cancer in a human subject who has not previously received chemotherapy involving the administration of MM-398 liposomal irinotecan, wherein the liposomal irinotecan was administered in combination with oxaliplatin, leucovorin and 5-fluorouracil (claim 3). P1 defined doses of 60 or 80 mg/m2 liposomal irinotecan (claim 5) and 60, 75 or 85 mg/m2 oxaliplatin (claim 8). Example 4 of the patent presented the results of a dose escalation/de-escalation study demonstrating the tolerability of the selected dose combination of claim 1 of the main request, as opposed to the intolerable and thus unsuitable alternative dose combinations defined in claims 5 and 8 of P1. The board observed that information concerning the tolerability of the selected dose combination of claim 1 of the main request was not revealed in P1. In particular, this information was not provided by the mere outline for the dose escalation/de-escalation study in P1, which the patent proprietor relied on as a pointer to the subject-matter of claim 1 of the main request with reference to T 1261/21. The board noted that in T 1261/21 the competent board had explained that a "pointer" in an original disclosure was an implicit or explicit indication or hint towards a combination of features, which demonstrated that this combination of features did not represent an arbitrary combination of features only conceptually comprised, but was actually envisaged in the original disclosure. However, the competent board had emphasised that what information a skilled person would directly and unambiguously derive from the original disclosure remained to be assessed on a case-by-case basis. According to the board, in the present case, P1 provided with the outline for the dose escalation/de-escalation study only a conditional proposal for the use of a combination of 60 mg/m2 liposomal irinotecan and 60 mg/m2 oxaliplatin as part of a study still to be carried out. This proposal could not be considered to provide any pointer to the combination of 60 mg/m2 liposomal irinotecan and 60 mg/m2 oxaliplatin uniquely tolerable in first-line treatment of patients with metastatic pancreatic cancer as defined in claim 1 of the main request. The board rejected the patent proprietor's argument that P1 described the same subject-matter as defined in claim 1 of the main request, which should in accordance with G 2/98 therefore benefit from the priority of P1, regardless of any additional technical effects, such as the results of the dose escalation/de-escalation study, which may have been described only in the subsequent application from which the patent was derived. The board observed that, according to the established jurisprudence of the Boards of Appeal, attaining the claimed therapeutic effect was regarded as a functional technical feature of claims in the format of Art. 54(5) EPC. Notably, the tolerability of the defined treatment was a prerequisite for the therapeutic efficacy (T 2506/12). The tolerability of the dose combination as defined in claim 1 of the main request, as opposed to the intolerability of the alternative combinations with higher doses of claims 5 and 8 and the dose escalation/de-escalation scheme in P1, was thus a functional technical feature of the subject-matter defined in claim 1 of the main request. This feature concerned information which was not directly and unambiguously derivable from P1. The board further observed that the Enlarged Board determined in G 2/98 that it is a condition for the compliance with the requirement of "the same invention" that the claimed subject-matter is directly and unambiguously derivable from the earlier application. However, the Enlarged Board did not conclude that the requirement of "the same invention" is necessarily satisfied if this condition is fulfilled, irrespective of any technical information associated with the claimed subject-matter, which is only described in the subsequent patent application. Notably, the established jurisprudence confirmed the need for sufficient disclosure of the claimed invention in the priority document.